PlatformCore: Conditionally set texture format

sRGB texture format is needed for the output to look right with
sRGB framebuffer enabled and no color correction shader applied.

src/platform/core/src/device/ogl_video_device.cpp

@@ -84,10 +84,14 @@ void OGLVideoDevice::UpdateTextures() {
   constexpr GLsizei gba_screen_width  = 240;
   constexpr GLsizei gba_screen_height = 160;
 
+  const auto texture_format =
+    config->video.color == Video::Color::No ? GL_SRGB8_ALPHA8 : GL_RGBA8;
+
   for(auto& texture_ref : texture) {
     glBindTexture(GL_TEXTURE_2D, texture_ref);
 
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, gba_screen_width, gba_screen_height, 0, GL_BGRA, GL_UNSIGNED_BYTE, nullptr);
+    glTexImage2D(GL_TEXTURE_2D, 0, texture_format, gba_screen_width,
+                 gba_screen_height, 0, GL_BGRA, GL_UNSIGNED_BYTE, nullptr);
 
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, texture_filter);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, texture_filter);