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ImFont::GetTextureData API allow to retrieve 8/32 bits data + lazily load defaults font

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Examples: OpenGL3 and DirectX11 back to using 32-bits texture solely for
ease of integration.
This commit is contained in:
ocornut
2015-01-11 21:06:57 +00:00
parent 241e8086fa
commit 0f4d74d614
6 changed files with 125 additions and 88 deletions
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20
examples/opengl3_example/main.cpp
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@ -198,8 +198,7 @@ void InitGL()
"out vec4 Out_Color;\n"
"void main()\n"
"{\n"
" Out_Color = Frag_Color;\n"
" Out_Color.w *= texture( Texture, Frag_UV.st).x;\n"
" Out_Color = Frag_Color * texture( Texture, Frag_UV.st);\n"
"}\n";
shader_handle = glCreateProgram();
@ -239,14 +238,17 @@ void InitGL()
void LoadFontTexture(ImFont* font)
{
IM_ASSERT(font && font->IsLoaded());
unsigned char* pixels;
int width, height;
font->GetTextureDataRGBA32(&pixels, &width, &height);
GLuint tex_id;
glGenTextures(1, &tex_id);
glBindTexture(GL_TEXTURE_2D, tex_id);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, font->TexWidth, font->TexHeight, 0, GL_RED, GL_UNSIGNED_BYTE, font->TexPixels);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
font->TexID = (void *)(intptr_t)tex_id;
}
@ -277,10 +279,9 @@ void InitImGui()
io.SetClipboardTextFn = ImImpl_SetClipboardTextFn;
io.GetClipboardTextFn = ImImpl_GetClipboardTextFn;
// Load font
io.Font->LoadDefault();
// Load font (optionally load a custom TTF font)
//io.Font->LoadFromFileTTF("myfont.ttf", font_size_px, ImFont::GetGlyphRangesDefault());
//io.Font->DisplayOffset.y += 0.0f;
//io.Font->DisplayOffset.y += 1.0f;
LoadFontTexture(io.Font);
}
@ -341,11 +342,6 @@ int main(int argc, char** argv)
show_test_window ^= ImGui::Button("Test Window");
show_another_window ^= ImGui::Button("Another Window");
static ImFont* font2 = NULL;
if (!font2) { font2 = new ImFont(); font2->LoadFromFileTTF("../../extra_fonts/ArialUni.ttf", 30.0f); LoadFontTexture(font2); }
ImGui::Image(font2->TexID, ImVec2((float)font2->TexWidth, (float)font2->TexHeight));
//ImGui::GetWindowDrawList()->AddText(font2, 30.0f, ImGui::GetCursorScreenPos(), 0xFFFFFFFF, "Another font");
// Calculate and show frame rate
static float ms_per_frame[120] = { 0 };
static int ms_per_frame_idx = 0;