Check if drivers support BGRA texture format and fallback to RGBA

src/graphics/central_settings.cpp

@@ -49,6 +49,10 @@ void CentralVideoSettings::init()
     hasUBO = false;
     hasExplicitAttribLocation = false;
     hasGS = false;
+    
+#if defined(USE_GLES2)
+    hasBGRA = false;
+#endif
 
     m_GI_has_artifact = false;
     m_need_rh_workaround = false;
@@ -218,6 +222,15 @@ void CentralVideoSettings::init()
             hasAtomics = true;
             hasSSBO = true;
         }
+        
+        if (!GraphicsRestrictions::isDisabled(GraphicsRestrictions::GR_TEXTURE_FORMAT_BGRA8888) &&
+            (hasGLExtension("GL_IMG_texture_format_BGRA8888") ||
+             hasGLExtension("GL_EXT_texture_format_BGRA8888")))
+        {
+            hasBGRA = true;
+            Log::info("GLDriver", "EXT texture format BGRA8888 Present");
+        }
+            
 #endif
     }
 }
@@ -337,6 +350,13 @@ bool CentralVideoSettings::isARBMultiDrawIndirectUsable() const
     return hasMultiDrawIndirect;
 }
 
+#if defined(USE_GLES2)
+bool CentralVideoSettings::isEXTTextureFormatBGRA8888Usable() const
+{
+    return hasBGRA;
+}
+#endif
+
 bool CentralVideoSettings::supportsShadows() const
 {
     return isARBGeometryShadersUsable() && isARBUniformBufferObjectUsable() && isARBExplicitAttribLocationUsable();

src/graphics/central_settings.hpp

@@ -42,6 +42,10 @@ private:
     bool hasSSBO;
     bool hasImageLoadStore;
     bool hasMultiDrawIndirect;
+    
+#if defined(USE_GLES2)
+    bool hasBGRA;
+#endif
 
     bool m_need_rh_workaround;
     bool m_need_srgb_workaround;
@@ -75,6 +79,10 @@ public:
     bool isARBImageLoadStoreUsable() const;
     bool isARBMultiDrawIndirectUsable() const;
     bool isARBExplicitAttribLocationUsable() const;
+    
+#if defined(USE_GLES2)
+    bool isEXTTextureFormatBGRA8888Usable() const;
+#endif
 
 
     // Are all required extensions available for feature support

src/graphics/graphics_restrictions.cpp

@@ -57,6 +57,9 @@ namespace GraphicsRestrictions
             "TextureCompressionS3TC",
             "AMDVertexShaderLayer",
             "ExplicitAttribLocation",
+#if defined(USE_GLES2)
+            "TextureFormatBGRA8888",
+#endif
             "DriverRecentEnough",
             "HighDefinitionTextures",
             "AdvancedPipeline",

src/graphics/graphics_restrictions.hpp

@@ -51,6 +51,9 @@ namespace GraphicsRestrictions
         GR_EXT_TEXTURE_COMPRESSION_S3TC,
         GR_AMD_VERTEX_SHADER_LAYER,
         GR_EXPLICIT_ATTRIB_LOCATION,
+#if defined(USE_GLES2)
+        GR_TEXTURE_FORMAT_BGRA8888,
+#endif
         GR_DRIVER_RECENT_ENOUGH,
         GR_HIGHDEFINITION_TEXTURES,
         GR_ADVANCED_PIPELINE,

src/graphics/texture_manager.cpp

@@ -87,10 +87,20 @@ void compressTexture(irr::video::ITexture *tex, bool srgb, bool premul_alpha)
     memcpy(data, tex->lock(), w * h * 4);
     tex->unlock();
     unsigned internalFormat, Format;
-    if (tex->hasAlpha())
-        Format = GL_BGRA;
-    else
-        Format = GL_BGR;
+    Format = tex->hasAlpha() ? GL_BGRA : GL_BGR;
+#if defined(USE_GLES2)
+    if (!CVS->isEXTTextureFormatBGRA8888Usable())
+    {
+        Format = tex->hasAlpha() ? GL_RGBA : GL_RGB;
+        
+        for (unsigned int i = 0; i < w * h; i++)
+        {
+            char tmp_val = data[i*4];
+            data[i*4] = data[i*4 + 2];
+            data[i*4 + 2] = tmp_val;
+        }
+    }
+#endif
 
     if (premul_alpha)
     {