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Examples: OpenGL2: Uploading font texture as RGBA32 to increase compatibility with users shaders for beginners (#824)

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This commit is contained in:
ocornut 2016-09-10 17:43:07 +02:00
parent 012223114d
commit 02399852fe
2 changed files with 3 additions and 3 deletions
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4
examples/opengl2_example/imgui_impl_glfw.cpp
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@ -161,7 +161,7 @@ bool ImGui_ImplGlfw_CreateDeviceObjects()
ImGuiIO& io = ImGui::GetIO(); ImGuiIO& io = ImGui::GetIO();
unsigned char* pixels; unsigned char* pixels;
int width, height; int width, height;
io.Fonts->GetTexDataAsAlpha8(&pixels, &width, &height); io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height); // Load as RGBA 32-bits (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.
// Upload texture to graphics system // Upload texture to graphics system
GLint last_texture; GLint last_texture;
@ -170,7 +170,7 @@ bool ImGui_ImplGlfw_CreateDeviceObjects()
glBindTexture(GL_TEXTURE_2D, g_FontTexture); glBindTexture(GL_TEXTURE_2D, g_FontTexture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, width, height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, pixels); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
// Store our identifier // Store our identifier
io.Fonts->TexID = (void *)(intptr_t)g_FontTexture; io.Fonts->TexID = (void *)(intptr_t)g_FontTexture;

2
examples/opengl3_example/imgui_impl_glfw_gl3.cpp
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@ -178,7 +178,7 @@ bool ImGui_ImplGlfwGL3_CreateFontsTexture()
ImGuiIO& io = ImGui::GetIO(); ImGuiIO& io = ImGui::GetIO();
unsigned char* pixels; unsigned char* pixels;
int width, height; int width, height;
io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height); // Load as RGBA 32-bits for OpenGL3 demo because it is more likely to be compatible with user's existing shader. io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height); // Load as RGBA 32-bits (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.
// Upload texture to graphics system // Upload texture to graphics system
GLint last_texture; GLint last_texture;