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OpenGL example: added commented code to load custom font from filesystem

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ocornut 2014-09-25 11:41:18 +01:00
parent eb1b9d4521
commit df1c056c88
1 changed files with 21 additions and 1 deletions
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22
examples/opengl_example/main.cpp
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@ -184,13 +184,33 @@ void InitImGui()
glBindTexture(GL_TEXTURE_2D, fontTex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
#if 1
// Default font (embedded in code)
const void* png_data;
unsigned int png_size;
ImGui::GetDefaultFontData(NULL, NULL, &png_data, &png_size);
int tex_x, tex_y, tex_comp;
void* tex_data = stbi_load_from_memory((const unsigned char*)png_data, (int)png_size, &tex_x, &tex_y, &tex_comp, 0);
#else
// Custom font from filesystem
io.Font = new ImBitmapFont();
io.Font->LoadFromFile("../../extra_fonts/arial_unicode_ms_18_CJK.fnt");
int tex_x, tex_y, tex_comp;
void* tex_data = stbi_load("../../extra_fonts/arial_unicode_ms_18_CJK.png", &tex_x, &tex_y, &tex_comp, 4);
// Automatically find white pixel from the texture we just loaded
// (io.FontTexUvForWhite needs to contains UV coordinates pointing to a white pixel in order to render solid objects)
for (int tex_data_off = 0; tex_data_off < tex_x*tex_y; tex_data_off++)
if (((unsigned int*)tex_data)[tex_data_off] == 0xffffffff)
{
io.FontTexUvForWhite = ImVec2((float)(tex_data_off % tex_x)/(tex_x), (float)(tex_data_off / tex_x)/(tex_y));
break;
}
#endif
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tex_x, tex_y, 0, GL_RGBA, GL_UNSIGNED_BYTE, tex_data);
stbi_image_free(tex_data);
stbi_image_free(tex_data);
}
void UpdateImGui()