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use Alpha8 texture in OpenGL 1.1

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no shaders anyway so we can save memory
This commit is contained in:
tildearrow 2024-04-08 18:24:42 -05:00
parent 2c3eaee513
commit 8b4581e5e6
1 changed files with 2 additions and 2 deletions
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4
extern/imgui_patched/backends/imgui_impl_opengl2.cpp vendored
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@ -260,7 +260,7 @@ bool ImGui_ImplOpenGL2_CreateFontsTexture()
ImGui_ImplOpenGL2_Data* bd = ImGui_ImplOpenGL2_GetBackendData();
unsigned char* pixels;
int width, height;
io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height); // Load as RGBA 32-bit (75% of the memory is wasted, but default font is so small) because it is more likely to be compatible with user's existing shaders. If your ImTextureId represent a higher-level concept than just a GL texture id, consider calling GetTexDataAsAlpha8() instead to save on GPU memory.
io.Fonts->GetTexDataAsAlpha8(&pixels, &width, &height); // Load as Alpha8 8-bit, because we don't use shaders anyway.
// Upload texture to graphics system
// (Bilinear sampling is required by default. Set 'io.Fonts->Flags |= ImFontAtlasFlags_NoBakedLines' or 'style.AntiAliasedLinesUseTex = false' to allow point/nearest sampling)
@ -271,7 +271,7 @@ bool ImGui_ImplOpenGL2_CreateFontsTexture()
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA8, width, height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, pixels);
// Store our identifier
io.Fonts->SetTexID((ImTextureID)(intptr_t)bd->FontTexture);