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.

Author: GranMinigun

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

@@ -93,11 +93,14 @@ void OGLVideoDevice::UpdateTextures() {
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
   };
 
+  const bool color_correction_active = config->video.color != Video::Color::No;
+  const auto texture_format = color_correction_active ? GL_RGBA8 : GL_SRGB8_ALPHA8;
+
   // Alternating input sampler and output framebuffer attachment.
   for(const auto texture : {textures[input_index], textures[output_index]}) {
     glBindTexture(GL_TEXTURE_2D, texture);
 
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, gba_screen_width,
+    glTexImage2D(GL_TEXTURE_2D, 0, texture_format, gba_screen_width,
                  gba_screen_height, 0, GL_BGRA, GL_UNSIGNED_BYTE, nullptr);
 
     set_texture_params(texture_filter);
@@ -110,12 +113,13 @@ void OGLVideoDevice::UpdateTextures() {
   const bool xbrz_ghosting =
     config->video.filter == Video::Filter::xBRZ && config->video.lcd_ghosting;
   if(config->video.lcd_ghosting) {
+    const GLint history_texture_format = (!color_correction_active || xbrz_ghosting) ? GL_SRGB8_ALPHA8 : GL_RGBA8;
     const GLsizei texture_width  = xbrz_ghosting ? view_width : gba_screen_width;
     const GLsizei texture_height = xbrz_ghosting ? view_height : gba_screen_height;
 
     glBindTexture(GL_TEXTURE_2D, textures[history_index]);
 
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, texture_width, texture_height, 0,
+    glTexImage2D(GL_TEXTURE_2D, 0, history_texture_format, texture_width, texture_height, 0,
                  GL_BGRA, GL_UNSIGNED_BYTE, nullptr);
 
     set_texture_params(GL_NEAREST);
@@ -124,7 +128,7 @@ void OGLVideoDevice::UpdateTextures() {
   if(xbrz_ghosting) {
     glBindTexture(GL_TEXTURE_2D, textures[xbrz_output_index]);
 
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, view_width, view_height, 0,
+    glTexImage2D(GL_TEXTURE_2D, 0, texture_format, view_width, view_height, 0,
                  GL_BGRA, GL_UNSIGNED_BYTE, nullptr);
 
     set_texture_params(GL_NEAREST);

src/platform/qt/src/widget/screen.cpp

@@ -29,6 +29,7 @@ void Screen::SetForceClear(bool force_clear) {
 }
 
 void Screen::ReloadConfig() {
+  makeCurrent(); // Workaround for Intel graphics.
   ogl_video_device.ReloadConfig();
   UpdateViewport();
 }