748 lines
23 KiB
C++
748 lines
23 KiB
C++
// By Emil Ernerfeldt 2018
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// LICENSE:
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// This software is dual-licensed to the public domain and under the following
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// license: you are granted a perpetual, irrevocable license to copy, modify,
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// publish, and distribute this file as you see fit.
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#include "imgui.h"
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#include "imgui_internal.h"
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#ifndef IMGUI_DISABLE
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#include "imgui_sw.hpp"
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#include <algorithm>
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#include <math.h>
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#include <vector>
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#include <SDL.h>
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struct ImGui_ImplSW_Data
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{
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SDL_Window* Window;
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SWTexture* FontTexture;
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ImGui_ImplSW_Data() { memset((void*)this, 0, sizeof(*this)); }
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};
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struct SwOptions
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{
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bool optimize_text = true;// No reason to turn this off.
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bool optimize_rectangles = true;// No reason to turn this off.
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};
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static ImGui_ImplSW_Data* ImGui_ImplSW_GetBackendData()
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{
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return ImGui::GetCurrentContext() ? (ImGui_ImplSW_Data*)ImGui::GetIO().BackendRendererUserData : nullptr;
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}
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struct PaintTarget
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{
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uint32_t *pixels;
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int width;
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int height;
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};
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// ----------------------------------------------------------------------------
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#pragma pack(push, 1)
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union ColorInt
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{
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struct {
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#ifdef TA_BIG_ENDIAN
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uint8_t a, r, g, b;
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#else
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uint8_t b, g, r, a;
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#endif
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};
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uint32_t u32;
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ColorInt():
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u32(0) {}
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ColorInt(uint32_t c):
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u32(c) {}
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ColorInt(uint8_t red, uint8_t green, uint8_t blue, uint8_t alpha):
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b(blue),
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g(green),
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r(red),
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a(alpha) {}
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static ColorInt bgra(uint32_t c) {
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return ColorInt((c&0xff00ff00)|((c&0xff)<<16)|((c&0xff0000)>>16));
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}
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ColorInt &operator*=(const ColorInt &other)
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{
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r = (r * other.r + 255) >> 8;
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g = (g * other.g + 255) >> 8;
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b = (b * other.b + 255) >> 8;
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a = (a * other.a + 255) >> 8;
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return *this;
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}
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};
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#pragma pack(pop)
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static inline uint32_t blend(const ColorInt &target, const ColorInt &source)
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{
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if (source.a == 0) return target.u32;
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if (source.a >= 255) return source.u32;
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const unsigned char ia=255-source.a;
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return (
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(target.a << 24u) |
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(((source.r * source.a + target.r * ia + 255) >> 8) << 16u) |
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(((source.g * source.a + target.g * ia + 255) >> 8) << 8u) |
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(((source.b * source.a + target.b * ia + 255) >> 8) << 0u)
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);
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}
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// ----------------------------------------------------------------------------
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// Used for interpolating vertex attributes (color and texture coordinates) in a triangle.
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struct Barycentric
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{
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float w0, w1, w2;
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};
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Barycentric operator*(const float f, const Barycentric &va) { return { f * va.w0, f * va.w1, f * va.w2 }; }
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void operator+=(Barycentric &a, const Barycentric &b)
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{
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a.w0 += b.w0;
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a.w1 += b.w1;
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a.w2 += b.w2;
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}
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Barycentric operator+(const Barycentric &a, const Barycentric &b)
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{
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return Barycentric{ a.w0 + b.w0, a.w1 + b.w1, a.w2 + b.w2 };
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}
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// ----------------------------------------------------------------------------
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// Useful operators on ImGui vectors:
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ImVec2 operator*(const float f, const ImVec2 &v) { return ImVec2{ f * v.x, f * v.y }; }
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bool operator!=(const ImVec2 &a, const ImVec2 &b) { return a.x != b.x || a.y != b.y; }
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ImVec4 operator*(const float f, const ImVec4 &v) { return ImVec4{ f * v.x, f * v.y, f * v.z, f * v.w }; }
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ColorInt operator*(const float other, const ColorInt& that)
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{
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return ColorInt(
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(that.r * (int)(other * 256.0f)) >> 8,
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(that.g * (int)(other * 256.0f)) >> 8,
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(that.b * (int)(other * 256.0f)) >> 8,
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(that.a * (int)(other * 256.0f)) >> 8
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);
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}
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ColorInt operator+(const ColorInt& l, const ColorInt& r) {
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return ColorInt(l.u32+r.u32);
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}
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// ----------------------------------------------------------------------------
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// Copies of functions in ImGui, inlined for speed:
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inline ImVec4 color_convert_u32_to_float4(ImU32 in)
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{
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const float s = 1.0f / 255.0f;
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return ImVec4(((in >> IM_COL32_R_SHIFT) & 0xFF) * s,
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((in >> IM_COL32_G_SHIFT) & 0xFF) * s,
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((in >> IM_COL32_B_SHIFT) & 0xFF) * s,
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((in >> IM_COL32_A_SHIFT) & 0xFF) * s);
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}
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inline ImU32 color_convert_float4_to_u32(const ImVec4 &in)
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{
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ImU32 out;
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out = uint32_t(in.x * 255.0f + 0.5f) << IM_COL32_B_SHIFT;
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out |= uint32_t(in.y * 255.0f + 0.5f) << IM_COL32_G_SHIFT;
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out |= uint32_t(in.z * 255.0f + 0.5f) << IM_COL32_R_SHIFT;
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out |= uint32_t(in.w * 255.0f + 0.5f) << IM_COL32_A_SHIFT;
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return out;
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}
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// ----------------------------------------------------------------------------
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// For fast and subpixel-perfect triangle rendering we used fixed point arithmetic.
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// To keep the code simple we use 64 bits to avoid overflows.
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// TODO: make it 32-bit or else
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using Int = int32_t;
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const Int kFixedBias = 1;
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struct Point
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{
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Int x, y;
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};
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Int orient2d(const Point &a, const Point &b, const Point &c)
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{
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return (b.x - a.x) * (c.y - a.y) - (b.y - a.y) * (c.x - a.x);
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}
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Int as_int(float v) { return static_cast<Int>(floor(v * kFixedBias)); }
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Point as_point(ImVec2 v) { return Point{ as_int(v.x), as_int(v.y) }; }
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// ----------------------------------------------------------------------------
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inline float min3(float a, float b, float c)
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{
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if (a < b && a < c) { return a; }
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return b < c ? b : c;
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}
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inline float max3(float a, float b, float c)
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{
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if (a > b && a > c) { return a; }
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return b > c ? b : c;
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}
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inline float barycentric(const ImVec2 &a, const ImVec2 &b, const ImVec2 &point)
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{
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return (b.x - a.x) * (point.y - a.y) - (b.y - a.y) * (point.x - a.x);
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}
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inline uint8_t sample_font_texture(const SWTexture &texture, int x, int y)
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{
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return ((const uint8_t*)texture.pixels)[x + y];
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}
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inline uint32_t sample_texture(const SWTexture &texture, int x, int y) { return texture.pixels[x + y]; }
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static void paint_uniform_rectangle(const PaintTarget &target,
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const ImVec2 &min_f,
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const ImVec2 &max_f,
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const ColorInt &color)
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{
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// don't if our rectangle is transparent
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if (color.a==0) return;
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// Integer bounding box [min, max):
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int min_x_i = (int)(min_f.x + 0.5f);
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int min_y_i = (int)(min_f.y + 0.5f);
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int max_x_i = (int)(max_f.x + 0.5f);
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int max_y_i = (int)(max_f.y + 0.5f);
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// Clamp to render target:
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min_x_i = std::max(min_x_i, 0);
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min_y_i = std::max(min_y_i, 0);
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max_x_i = std::min(max_x_i, target.width);
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max_y_i = std::min(max_y_i, target.height);
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if (color.a==255) {
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// fast path if alpha blending is not necessary
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for (int y = min_y_i; y < max_y_i; ++y) {
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uint32_t* target_pixel = &target.pixels[y * target.width + min_x_i - 1];
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for (int x = min_x_i; x < max_x_i; ++x) {
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++target_pixel;
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*target_pixel = color.u32;
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}
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}
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} else {
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// We often blend the same colors over and over again, so optimize for this (saves 25% total cpu):
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uint32_t last_target_pixel = target.pixels[min_y_i * target.width + min_x_i];
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const ColorInt* lastColorRef = (const ColorInt*)(&last_target_pixel);
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uint32_t last_output = blend(*lastColorRef, color);
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for (int y = min_y_i; y < max_y_i; ++y) {
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uint32_t* target_pixel = &target.pixels[y * target.width + min_x_i - 1];
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for (int x = min_x_i; x < max_x_i; ++x) {
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++target_pixel;
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if (*target_pixel == last_target_pixel) {
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*target_pixel = last_output;
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continue;
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}
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last_target_pixel = *target_pixel;
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const ColorInt* colorRef = (const ColorInt*)(target_pixel);
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*target_pixel = blend(*colorRef, color);
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last_output = *target_pixel;
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}
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}
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}
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}
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static void paint_uniform_textured_rectangle(const PaintTarget &target,
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const SWTexture &texture,
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const ImVec4 &clip_rect,
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const ImDrawVert &min_v,
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const ImDrawVert &max_v)
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{
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const ImVec2 min_p = ImVec2(min_v.pos.x, min_v.pos.y);
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const ImVec2 max_p = ImVec2(max_v.pos.x, max_v.pos.y);
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float distanceX = max_p.x - min_p.x;
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float distanceY = max_p.y - min_p.y;
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if (distanceX == 0 || distanceY == 0) { return; }
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// Find bounding box:
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float min_x_f = min_p.x;
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float min_y_f = min_p.y;
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float max_x_f = max_p.x;
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float max_y_f = max_p.y;
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// Clip against clip_rect:
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min_x_f = std::max(min_x_f, clip_rect.x);
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min_y_f = std::max(min_y_f, clip_rect.y);
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max_x_f = std::min(max_x_f, clip_rect.z - 0.5f);
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max_y_f = std::min(max_y_f, clip_rect.w - 0.5f);
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// Integer bounding box [min, max):
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int min_x_i = (int)(min_x_f);
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int min_y_i = (int)(min_y_f);
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int max_x_i = (int)(max_x_f + 1.0f);
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int max_y_i = (int)(max_y_f + 1.0f);
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// Clip against render target:
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min_x_i = std::max(min_x_i, 0);
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min_y_i = std::max(min_y_i, 0);
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max_x_i = std::min(max_x_i, target.width);
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max_y_i = std::min(max_y_i, target.height);
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const auto topleft = ImVec2(min_x_i + 0.5f, min_y_i + 0.5f);
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const ImVec2 delta_uv_per_pixel = {
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(max_v.uv.x - min_v.uv.x) / distanceX,
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(max_v.uv.y - min_v.uv.y) / distanceY,
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};
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const ImVec2 uv_topleft = {
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min_v.uv.x + (topleft.x - min_v.pos.x) * delta_uv_per_pixel.x,
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min_v.uv.y + (topleft.y - min_v.pos.y) * delta_uv_per_pixel.y,
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};
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int startX = uv_topleft.x * (texture.width - 1.0f) + 0.5f;
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int startY = uv_topleft.y * (texture.height - 1.0f) + 0.5f;
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if (startX<0) startX=0;
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if (startX>texture.width-1) startX=texture.width-1;
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if (startY<0) startY=0;
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if (startY>texture.height-1) startY=texture.height-1;
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int currentX = startX;
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int currentY = startY * texture.width;
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float deltaX = delta_uv_per_pixel.x * texture.width;
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float deltaY = delta_uv_per_pixel.y * texture.height;
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const ColorInt colorRef = ColorInt::bgra(min_v.col);
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for (int y = min_y_i; y < max_y_i; ++y) {
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currentX = startX;
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uint32_t* target_pixel = &target.pixels[y * target.width - 1 + min_x_i];
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for (int x = min_x_i; x < max_x_i; ++x) {
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++target_pixel;
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const ColorInt* targetColorRef = (const ColorInt*)(target_pixel);
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if (texture.isAlpha) {
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uint8_t texel = sample_font_texture(texture, currentX, currentY);
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if (deltaX != 0 && currentX < texture.width - 1) { currentX += 1; }
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// The font texture is all black or all white, so optimize for this:
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// anti-aliasing will be lost, but it doesn't matter
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if (texel & 0x80) {
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*target_pixel = blend(*targetColorRef, colorRef);
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}
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continue;
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} else {
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uint32_t texColor = sample_texture(texture, currentX, currentY);
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auto src_color = ColorInt(texColor);
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if (deltaX != 0 && currentX < texture.width - 1) { currentX += 1; }
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src_color *= colorRef;
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*target_pixel = blend(*targetColorRef, src_color);
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}
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}
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if (deltaY != 0 && currentY < (texture.height - 1)*texture.width) { currentY += texture.width; }
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}
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}
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// When two triangles share an edge, we want to draw the pixels on that edge exactly once.
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// The edge will be the same, but the direction will be the opposite
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// (assuming the two triangles have the same winding order).
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// Which edge wins? This functions decides.
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static bool is_dominant_edge(ImVec2 edge)
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{
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// return edge.x < 0 || (edge.x == 0 && edge.y > 0);
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return edge.y > 0 || (edge.y == 0 && edge.x < 0);
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}
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// Handles triangles in any winding order (CW/CCW)
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static void paint_triangle(const PaintTarget &target,
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const SWTexture *texture,
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const ImVec4 &clip_rect,
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const ImDrawVert &v0,
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const ImDrawVert &v1,
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const ImDrawVert &v2)
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{
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const ImVec2 p0 = ImVec2(v0.pos.x, v0.pos.y);
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const ImVec2 p1 = ImVec2(v1.pos.x, v1.pos.y);
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const ImVec2 p2 = ImVec2(v2.pos.x, v2.pos.y);
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const auto rect_area = barycentric(p0, p1, p2);// Can be positive or negative depending on winding order
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if (rect_area == 0.0f) { return; }
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// if (rect_area < 0.0f) { return paint_triangle(target, texture, clip_rect, v0, v2, v1); }
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// Find bounding box:
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float min_x_f = min3(p0.x, p1.x, p2.x);
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float min_y_f = min3(p0.y, p1.y, p2.y);
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float max_x_f = max3(p0.x, p1.x, p2.x);
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float max_y_f = max3(p0.y, p1.y, p2.y);
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// Clip against clip_rect:
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min_x_f = std::max(min_x_f, clip_rect.x);
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min_y_f = std::max(min_y_f, clip_rect.y);
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max_x_f = std::min(max_x_f, clip_rect.z - 0.5f);
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max_y_f = std::min(max_y_f, clip_rect.w - 0.5f);
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// Integer bounding box [min, max):
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int min_x_i = (int)(min_x_f);
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int min_y_i = (int)(min_y_f);
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int max_x_i = (int)(max_x_f + 1.0f);
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int max_y_i = (int)(max_y_f + 1.0f);
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// Clip against render target:
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min_x_i = std::max(min_x_i, 0);
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min_y_i = std::max(min_y_i, 0);
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max_x_i = std::min(max_x_i, target.width);
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max_y_i = std::min(max_y_i, target.height);
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// ------------------------------------------------------------------------
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// Set up interpolation of barycentric coordinates:
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const auto topleft = ImVec2(min_x_i + 0.5f, min_y_i + 0.5f);
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const auto dx = ImVec2(1, 0);
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const auto dy = ImVec2(0, 1);
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const auto w0_topleft = barycentric(p1, p2, topleft);
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const auto w1_topleft = barycentric(p2, p0, topleft);
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const auto w2_topleft = barycentric(p0, p1, topleft);
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const auto w0_dx = barycentric(p1, p2, topleft + dx) - w0_topleft;
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const auto w1_dx = barycentric(p2, p0, topleft + dx) - w1_topleft;
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const auto w2_dx = barycentric(p0, p1, topleft + dx) - w2_topleft;
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const auto w0_dy = barycentric(p1, p2, topleft + dy) - w0_topleft;
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const auto w1_dy = barycentric(p2, p0, topleft + dy) - w1_topleft;
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const auto w2_dy = barycentric(p0, p1, topleft + dy) - w2_topleft;
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const Barycentric bary_0{ 1, 0, 0 };
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const Barycentric bary_1{ 0, 1, 0 };
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const Barycentric bary_2{ 0, 0, 1 };
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const auto inv_area = 1 / rect_area;
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const Barycentric bary_topleft = inv_area * (w0_topleft * bary_0 + w1_topleft * bary_1 + w2_topleft * bary_2);
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const Barycentric bary_dx = inv_area * (w0_dx * bary_0 + w1_dx * bary_1 + w2_dx * bary_2);
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const Barycentric bary_dy = inv_area * (w0_dy * bary_0 + w1_dy * bary_1 + w2_dy * bary_2);
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Barycentric bary_current_row = bary_topleft;
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// ------------------------------------------------------------------------
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// For pixel-perfect inside/outside testing:
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const int sign = rect_area > 0 ? 1 : -1;// winding order?
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const int bias0i = is_dominant_edge(p2 - p1) ? 0 : -1;
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const int bias1i = is_dominant_edge(p0 - p2) ? 0 : -1;
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const int bias2i = is_dominant_edge(p1 - p0) ? 0 : -1;
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const auto p0i = as_point(p0);
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const auto p1i = as_point(p1);
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const auto p2i = as_point(p2);
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// ------------------------------------------------------------------------
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const bool has_uniform_color = (v0.col == v1.col && v0.col == v2.col);
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const ColorInt c0 = ColorInt::bgra(v0.col);
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const ColorInt c1 = ColorInt::bgra(v1.col);
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const ColorInt c2 = ColorInt::bgra(v2.col);
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// We often blend the same colors over and over again, so optimize for this (saves 10% total cpu):
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uint32_t last_target_pixel = 0;
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const ColorInt* lastColorRef = (const ColorInt*)(&last_target_pixel);
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const ColorInt colorRef = ColorInt::bgra(v0.col);
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uint32_t last_output = blend(*lastColorRef, colorRef);
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for (int y = min_y_i; y < max_y_i; ++y) {
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auto bary = bary_current_row;
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bool has_been_inside_this_row = false;
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uint32_t* target_pixel = &target.pixels[y * target.width + min_x_i - 1];
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for (int x = min_x_i; x < max_x_i; ++x) {
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const auto w0 = bary.w0;
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const auto w1 = bary.w1;
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const auto w2 = bary.w2;
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bary += bary_dx;
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++target_pixel;
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{
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// Inside/outside test:
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const auto p = Point{ kFixedBias * x + kFixedBias / 2, kFixedBias * y + kFixedBias / 2 };
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const auto w0i = sign * orient2d(p1i, p2i, p) + bias0i;
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const auto w1i = sign * orient2d(p2i, p0i, p) + bias1i;
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const auto w2i = sign * orient2d(p0i, p1i, p) + bias2i;
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if (w0i < 0 || w1i < 0 || w2i < 0) {
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if (has_been_inside_this_row) {
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break;// Gives a nice 10% speedup
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} else {
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continue;
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}
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}
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}
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has_been_inside_this_row = true;
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if (has_uniform_color && !texture) {
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if (*target_pixel == last_target_pixel) {
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*target_pixel = last_output;
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continue;
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}
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last_target_pixel = *target_pixel;
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*target_pixel = blend(*lastColorRef, colorRef);
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last_output = *target_pixel;
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continue;
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}
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ColorInt src_color;
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if (has_uniform_color) {
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src_color = c0;
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} else {
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src_color = w0 * c0 + w1 * c1 + w2 * c2;
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}
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if (texture) {
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if (!texture->isAlpha) { printf("warning: different texture\n"); }
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const ImVec2 uv = w0 * v0.uv + w1 * v1.uv + w2 * v2.uv;
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int x = uv.x * (texture->width - 1.0f) + 0.5f;
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int y = uv.y * (texture->height - 1.0f) + 0.5f;
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src_color.a = (src_color.a * sample_font_texture(*texture, x, y) + 255) >> 8;
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}
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if (!src_color.a) { continue; }// Transparent.
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if (src_color.a == 255) {
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// Opaque, no blending needed:
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*target_pixel = src_color.u32;
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continue;
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}
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const ColorInt* target_color = (const ColorInt*)target_pixel;
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*target_pixel = blend(*target_color, src_color);
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}
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bary_current_row += bary_dy;
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}
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}
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static void paint_draw_cmd(const PaintTarget &target,
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const ImDrawVert *vertices,
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const ImDrawIdx *idx_buffer,
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const ImDrawCmd &pcmd,
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const SwOptions &options,
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const ImVec2& white_uv)
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{
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const SWTexture* texture = (const SWTexture*)(pcmd.TextureId);
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IM_ASSERT(texture);
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for (unsigned int i = 0; i + 3 <= pcmd.ElemCount;) {
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ImDrawVert v0 = vertices[idx_buffer[i + 0]];
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ImDrawVert v1 = vertices[idx_buffer[i + 1]];
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ImDrawVert v2 = vertices[idx_buffer[i + 2]];
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// Text is common, and is made of textured rectangles. So let's optimize for it.
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// This assumes the ImGui way to layout text does not change.
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if (options.optimize_text && i + 6 <= pcmd.ElemCount && idx_buffer[i + 3] == idx_buffer[i + 0]
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&& idx_buffer[i + 4] == idx_buffer[i + 2]) {
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ImDrawVert v3 = vertices[idx_buffer[i + 5]];
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if (v0.pos.x == v3.pos.x && v1.pos.x == v2.pos.x && v0.pos.y == v1.pos.y && v2.pos.y == v3.pos.y
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&& v0.uv.x == v3.uv.x && v1.uv.x == v2.uv.x && v0.uv.y == v1.uv.y && v2.uv.y == v3.uv.y) {
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const bool has_uniform_color = v0.col == v1.col && v0.col == v2.col && v0.col == v3.col;
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const bool has_texture = v0.uv != white_uv || v1.uv != white_uv || v2.uv != white_uv || v3.uv != white_uv;
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if (has_uniform_color && has_texture) {
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paint_uniform_textured_rectangle(target, *texture, pcmd.ClipRect, v0, v2);
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i += 6;
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continue;
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}
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}
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}
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// A lot of the big stuff are uniformly colored rectangles,
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// so we can save a lot of CPU by detecting them:
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if (options.optimize_rectangles && i + 6 <= pcmd.ElemCount) {
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ImDrawVert v3 = vertices[idx_buffer[i + 3]];
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ImDrawVert v4 = vertices[idx_buffer[i + 4]];
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ImDrawVert v5 = vertices[idx_buffer[i + 5]];
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ImVec2 min, max;
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min.x = min3(v0.pos.x, v1.pos.x, v2.pos.x);
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min.y = min3(v0.pos.y, v1.pos.y, v2.pos.y);
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max.x = max3(v0.pos.x, v1.pos.x, v2.pos.x);
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max.y = max3(v0.pos.y, v1.pos.y, v2.pos.y);
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// Not the prettiest way to do this, but it catches all cases
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// of a rectangle split into two triangles.
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// TODO: Stop it from also assuming duplicate triangles is one rectangle.
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if ((v0.pos.x == min.x || v0.pos.x == max.x) && (v0.pos.y == min.y || v0.pos.y == max.y)
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&& (v1.pos.x == min.x || v1.pos.x == max.x) && (v1.pos.y == min.y || v1.pos.y == max.y)
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&& (v2.pos.x == min.x || v2.pos.x == max.x) && (v2.pos.y == min.y || v2.pos.y == max.y)
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&& (v3.pos.x == min.x || v3.pos.x == max.x) && (v3.pos.y == min.y || v3.pos.y == max.y)
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&& (v4.pos.x == min.x || v4.pos.x == max.x) && (v4.pos.y == min.y || v4.pos.y == max.y)
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&& (v5.pos.x == min.x || v5.pos.x == max.x) && (v5.pos.y == min.y || v5.pos.y == max.y)) {
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const bool has_uniform_color =
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v0.col == v1.col && v0.col == v2.col && v0.col == v3.col && v0.col == v4.col && v0.col == v5.col;
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min.x = std::max(min.x, pcmd.ClipRect.x);
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min.y = std::max(min.y, pcmd.ClipRect.y);
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max.x = std::min(max.x, pcmd.ClipRect.z - 0.5f);
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max.y = std::min(max.y, pcmd.ClipRect.w - 0.5f);
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if (max.x < min.x || max.y < min.y) {
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i += 6;
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continue;
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}// Completely clipped
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if (has_uniform_color) {
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const ColorInt colorRef = ColorInt::bgra(v0.col);
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paint_uniform_rectangle(target, min, max, colorRef);
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i += 6;
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continue;
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}
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}
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}
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const bool has_texture = (v0.uv != white_uv || v1.uv != white_uv || v2.uv != white_uv);
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paint_triangle(target, has_texture ? texture : nullptr, pcmd.ClipRect, v0, v1, v2);
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i += 3;
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}
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}
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static void paint_draw_list(const PaintTarget &target, const ImDrawList *cmd_list, const SwOptions &options)
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{
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const ImDrawIdx *idx_buffer = &cmd_list->IdxBuffer[0];
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const ImDrawVert *vertices = cmd_list->VtxBuffer.Data;
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const ImVec2 white_uv = cmd_list->_Data->TexUvWhitePixel;
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for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.size(); cmd_i++) {
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const ImDrawCmd &pcmd = cmd_list->CmdBuffer[cmd_i];
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if (pcmd.UserCallback) {
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pcmd.UserCallback(cmd_list, &pcmd);
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} else {
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paint_draw_cmd(target, vertices, idx_buffer, pcmd, options, white_uv);
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}
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idx_buffer += pcmd.ElemCount;
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}
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}
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static void paint_imgui(uint32_t *pixels, ImDrawData *drawData, int fb_width, int fb_height, const SwOptions &options = {})
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{
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if (fb_width <= 0 || fb_height <= 0) return;
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PaintTarget target{ pixels, fb_width, fb_height };
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for (int i = 0; i < drawData->CmdListsCount; ++i) {
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paint_draw_list(target, drawData->CmdLists[i], options);
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}
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}
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/// NEW STUFF
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bool ImGui_ImplSW_Init(SDL_Window* win) {
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ImGuiIO& io = ImGui::GetIO();
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IM_ASSERT(io.BackendRendererUserData == nullptr);
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if (SDL_HasWindowSurface(win)==SDL_FALSE) {
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return false;
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}
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ImGui_ImplSW_Data* bd = IM_NEW(ImGui_ImplSW_Data)();
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bd->Window = win;
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io.BackendRendererUserData = (void*)bd;
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io.BackendRendererName = "imgui_sw";
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return true;
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}
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void ImGui_ImplSW_Shutdown() {
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ImGui_ImplSW_Data* bd = ImGui_ImplSW_GetBackendData();
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IM_ASSERT(bd != nullptr);
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ImGuiIO& io = ImGui::GetIO();
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ImGui_ImplSW_DestroyDeviceObjects();
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io.BackendRendererName = nullptr;
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io.BackendRendererUserData = nullptr;
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IM_DELETE(bd);
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}
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bool ImGui_ImplSW_NewFrame() {
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ImGui_ImplSW_Data* bd = ImGui_ImplSW_GetBackendData();
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IM_ASSERT(bd != nullptr);
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if (!bd->FontTexture) ImGui_ImplSW_CreateDeviceObjects();
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return true;
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}
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void ImGui_ImplSW_RenderDrawData(ImDrawData* draw_data) {
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ImGui_ImplSW_Data* bd = ImGui_ImplSW_GetBackendData();
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IM_ASSERT(bd != nullptr);
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SDL_Surface* surf = SDL_GetWindowSurface(bd->Window);
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if (!surf) return;
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bool mustLock=SDL_MUSTLOCK(surf);
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if (mustLock) {
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if (SDL_LockSurface(surf)!=0) return;
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}
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paint_imgui((uint32_t*)surf->pixels,draw_data,surf->w,surf->h);
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// 0xAARRGGBB
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if (mustLock) {
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SDL_UnlockSurface(surf);
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}
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}
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/// CREATE OBJECTS
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bool ImGui_ImplSW_CreateFontsTexture() {
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ImGuiIO &io = ImGui::GetIO();
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ImGui_ImplSW_Data* bd = ImGui_ImplSW_GetBackendData();
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// Load default font (embedded in code):
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uint8_t *tex_data;
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int font_width, font_height;
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io.Fonts->GetTexDataAsAlpha8(&tex_data, &font_width, &font_height);
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SWTexture* texture = new SWTexture((uint32_t*)tex_data,font_width,font_height,true);
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io.Fonts->SetTexID(texture);
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bd->FontTexture = texture;
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return true;
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}
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void ImGui_ImplSW_DestroyFontsTexture() {
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ImGuiIO& io = ImGui::GetIO();
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ImGui_ImplSW_Data* bd = ImGui_ImplSW_GetBackendData();
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if (bd->FontTexture)
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{
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delete bd->FontTexture;
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io.Fonts->SetTexID(0);
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bd->FontTexture = 0;
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}
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}
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bool ImGui_ImplSW_CreateDeviceObjects() {
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return ImGui_ImplSW_CreateFontsTexture();
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}
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void ImGui_ImplSW_DestroyDeviceObjects() {
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ImGui_ImplSW_DestroyFontsTexture();
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}
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#endif // #ifndef IMGUI_DISABLE
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