[OpenGL] Use 32bit font texture until someone figures out why 8-bit looks worse

src/gl/imgui_impl_opengl3.cpp

@@ -96,7 +96,7 @@ static bool ImGui_ImplOpenGL3_CreateFontsTexture()
     ImGuiIO& io = ImGui::GetIO();
     unsigned char* pixels;
     int width, height;
-    io.Fonts->GetTexDataAsAlpha8(&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->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.
 
     // Upload texture to graphics system
     GLint last_texture;
@@ -109,7 +109,7 @@ static bool ImGui_ImplOpenGL3_CreateFontsTexture()
     if (g_IsGLES || g_GlVersion >= 2000)
         glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, pixels);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
 
     // Store our identifier
     io.Fonts->TexID = (ImTextureID)(intptr_t)g_FontTexture;
@@ -249,7 +249,7 @@ static bool    ImGui_ImplOpenGL3_CreateDeviceObjects()
         "varying vec4 Frag_Color;\n"
         "void main()\n"
         "{\n"
-        "    gl_FragColor = Frag_Color * texture2D(Texture, Frag_UV.st).r;\n"
+        "    gl_FragColor = Frag_Color * texture2D(Texture, Frag_UV.st);\n"
         "}\n";
 
     const GLchar* fragment_shader_glsl_130 =
@@ -259,7 +259,7 @@ static bool    ImGui_ImplOpenGL3_CreateDeviceObjects()
         "out vec4 Out_Color;\n"
         "void main()\n"
         "{\n"
-        "    Out_Color = Frag_Color * texture(Texture, Frag_UV.st).r;\n"
+        "    Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
         "}\n";
 
     const GLchar* fragment_shader_glsl_300_es =
@@ -270,7 +270,7 @@ static bool    ImGui_ImplOpenGL3_CreateDeviceObjects()
         "layout (location = 0) out vec4 Out_Color;\n"
         "void main()\n"
         "{\n"
-        "    Out_Color = Frag_Color * texture(Texture, Frag_UV.st).r;\n"
+        "    Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
         "}\n";
 
     const GLchar* fragment_shader_glsl_410_core =
@@ -280,7 +280,7 @@ static bool    ImGui_ImplOpenGL3_CreateDeviceObjects()
         "layout (location = 0) out vec4 Out_Color;\n"
         "void main()\n"
         "{\n"
-        "    Out_Color = Frag_Color * texture(Texture, Frag_UV.st).r;\n"
+        "    Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
         "}\n";
 
 #ifndef NDEBUG