From df1c056c88c5aa12a2331801254e544166bf927c Mon Sep 17 00:00:00 2001 From: ocornut Date: Thu, 25 Sep 2014 11:41:18 +0100 Subject: [PATCH] OpenGL example: added commented code to load custom font from filesystem --- examples/opengl_example/main.cpp | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-) diff --git a/examples/opengl_example/main.cpp b/examples/opengl_example/main.cpp index 8b44ed52..17b8a938 100644 --- a/examples/opengl_example/main.cpp +++ b/examples/opengl_example/main.cpp @@ -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()