OPENGL: Support RGBA8888 swapped textures when using OpenGL ES

3 files changed, 106 insertions, 38 deletions

diff --git a/backends/graphics/opengl/opengl-graphics.cpp b/backends/graphics/opengl/opengl-graphics.cpp
index 83d2c86058..3ee374eaab 100644
--- a/backends/graphics/opengl/opengl-graphics.cpp
+++ b/backends/graphics/opengl/opengl-graphics.cpp
@@ -208,25 +208,16 @@ Common::List<Graphics::PixelFormat> OpenGLGraphicsManager::getSupportedFormats()
 	// RGBA4444
 	formats.push_back(Graphics::PixelFormat(2, 4, 4, 4, 4, 12, 8, 4, 0));
 
-#if !USE_FORCED_GLES && !USE_FORCED_GLES2
-#if !USE_FORCED_GL
-	if (!isGLESContext()) {
-#endif
+	// These formats are not natively supported by OpenGL ES implementations,
+	// we convert the pixel format internally.
 #ifdef SCUMM_LITTLE_ENDIAN
-		// RGBA8888
-		formats.push_back(Graphics::PixelFormat(4, 8, 8, 8, 8, 24, 16, 8, 0));
+	// RGBA8888
+	formats.push_back(Graphics::PixelFormat(4, 8, 8, 8, 8, 24, 16, 8, 0));
 #else
-		// ABGR8888
-		formats.push_back(Graphics::PixelFormat(4, 8, 8, 8, 8, 0, 8, 16, 24));
-#endif
-#if !USE_FORCED_GL
-	}
-#endif
+	// ABGR8888
+	formats.push_back(Graphics::PixelFormat(4, 8, 8, 8, 8, 0, 8, 16, 24));
 #endif
-
 	// RGB555, this is used by SCUMM HE 16 bit games.
-	// This is not natively supported by OpenGL ES implementations, we convert
-	// the pixel format internally.
 	formats.push_back(Graphics::PixelFormat(2, 5, 5, 5, 0, 10, 5, 0, 0));
 
 	formats.push_back(Graphics::PixelFormat::createFormatCLUT8());
@@ -1109,9 +1100,14 @@ Surface *OpenGLGraphicsManager::createSurface(const Graphics::PixelFormat &forma
 		// OpenGL ES does not support a texture format usable for RGB555.
 		// Since SCUMM uses this pixel format for some games (and there is no
 		// hope for this to change anytime soon) we use pixel format
-		// conversion to a supported texture format. However, this is a one
-		// time exception.
+		// conversion to a supported texture format.
 		return new TextureRGB555();
+#ifdef SCUMM_LITTLE_ENDIAN
+	} else if (isGLESContext() && format == Graphics::PixelFormat(4, 8, 8, 8, 8, 24, 16, 8, 0)) { // RGBA8888
+#else
+	} else if (isGLESContext() && format == Graphics::PixelFormat(4, 8, 8, 8, 8, 0, 8, 16, 24)) { // ABGR8888
+#endif
+		return new TextureRGBA8888Swap();
 #endif // !USE_FORCED_GL
 	} else {
 		const bool supported = getGLPixelFormat(format, glIntFormat, glFormat, glType);
diff --git a/backends/graphics/opengl/texture.cpp b/backends/graphics/opengl/texture.cpp
index 2a078534ab..93480f7360 100644
--- a/backends/graphics/opengl/texture.cpp
+++ b/backends/graphics/opengl/texture.cpp
@@ -26,6 +26,7 @@
 #include "backends/graphics/opengl/pipelines/clut8.h"
 #include "backends/graphics/opengl/framebuffer.h"
 
+#include "common/endian.h"
 #include "common/rect.h"
 #include "common/textconsole.h"
 
@@ -423,7 +424,7 @@ void TextureCLUT8::updateGLTexture() {
 		                        dirtyArea.width(), dirtyArea.height(),
 		                        outSurf->pitch, _clut8Data.pitch, (const uint32 *)_palette);
 	} else {
-		warning("TextureCLUT8::updateTexture: Unsupported pixel depth: %d", outSurf->format.bytesPerPixel);
+		warning("TextureCLUT8::updateGLTexture: Unsupported pixel depth: %d", outSurf->format.bytesPerPixel);
 	}
 
 	// Do generic handling of updating the texture.
@@ -431,32 +432,37 @@ void TextureCLUT8::updateGLTexture() {
 }
 
 #if !USE_FORCED_GL
-TextureRGB555::TextureRGB555()
-    : Texture(GL_RGB, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, Graphics::PixelFormat(2, 5, 6, 5, 0, 11, 5, 0, 0)),
-      _rgb555Data() {
+FakeTexture::FakeTexture(GLenum glIntFormat, GLenum glFormat, GLenum glType, const Graphics::PixelFormat &format)
+    : Texture(glIntFormat, glFormat, glType, format),
+      _rgbData() {
 }
 
-TextureRGB555::~TextureRGB555() {
-	_rgb555Data.free();
+FakeTexture::~FakeTexture() {
+	_rgbData.free();
 }
 
-void TextureRGB555::allocate(uint width, uint height) {
+void FakeTexture::allocate(uint width, uint height) {
 	Texture::allocate(width, height);
 
-	// We only need to reinitialize our RGB555 surface when the output size
+	// We only need to reinitialize our surface when the output size
 	// changed.
-	if (width == _rgb555Data.w && height == _rgb555Data.h) {
+	if (width == _rgbData.w && height == _rgbData.h) {
 		return;
 	}
 
-	_rgb555Data.create(width, height, Graphics::PixelFormat(2, 5, 5, 5, 0, 10, 5, 0, 0));
+	warning("%s pixel format not supported by OpenGL ES, using %s instead", getFormat().toString().c_str(), _format.toString().c_str());
+	_rgbData.create(width, height, getFormat());
+}
+
+TextureRGB555::TextureRGB555()
+    : FakeTexture(GL_RGB, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, Graphics::PixelFormat(2, 5, 6, 5, 0, 11, 5, 0, 0)) {
 }
 
 Graphics::PixelFormat TextureRGB555::getFormat() const {
 	return Graphics::PixelFormat(2, 5, 5, 5, 0, 10, 5, 0, 0);
 }
 
-void TextureRGB555::updateTexture() {
+void TextureRGB555::updateGLTexture() {
 	if (!isDirty()) {
 		return;
 	}
@@ -469,8 +475,8 @@ void TextureRGB555::updateTexture() {
 	uint16 *dst = (uint16 *)outSurf->getBasePtr(dirtyArea.left, dirtyArea.top);
 	const uint dstAdd = outSurf->pitch - 2 * dirtyArea.width();
 
-	const uint16 *src = (const uint16 *)_rgb555Data.getBasePtr(dirtyArea.left, dirtyArea.top);
-	const uint srcAdd = _rgb555Data.pitch - 2 * dirtyArea.width();
+	const uint16 *src = (const uint16 *)_rgbData.getBasePtr(dirtyArea.left, dirtyArea.top);
+	const uint srcAdd = _rgbData.pitch - 2 * dirtyArea.width();
 
 	for (int height = dirtyArea.height(); height > 0; --height) {
 		for (int width = dirtyArea.width(); width > 0; --width) {
@@ -488,6 +494,54 @@ void TextureRGB555::updateTexture() {
 	// Do generic handling of updating the texture.
 	Texture::updateGLTexture();
 }
+
+TextureRGBA8888Swap::TextureRGBA8888Swap()
+#ifdef SCUMM_LITTLE_ENDIAN
+    : FakeTexture(GL_RGBA, GL_RGBA, GL_UNSIGNED_BYTE, Graphics::PixelFormat(4, 8, 8, 8, 8, 0, 8, 16, 24)) // ABGR8888
+#else
+    : FakeTexture(GL_RGBA, GL_RGBA, GL_UNSIGNED_BYTE, Graphics::PixelFormat(4, 8, 8, 8, 8, 24, 16, 8, 0)) // RGBA8888
+#endif
+      {
+}
+
+Graphics::PixelFormat TextureRGBA8888Swap::getFormat() const {
+#ifdef SCUMM_LITTLE_ENDIAN
+	return Graphics::PixelFormat(4, 8, 8, 8, 8, 24, 16, 8, 0); // RGBA8888
+#else
+	return Graphics::PixelFormat(4, 8, 8, 8, 8, 0, 8, 16, 24); // ABGR8888
+#endif
+}
+
+void TextureRGBA8888Swap::updateGLTexture() {
+	if (!isDirty()) {
+		return;
+	}
+
+	// Convert color space.
+	Graphics::Surface *outSurf = Texture::getSurface();
+
+	const Common::Rect dirtyArea = getDirtyArea();
+
+	uint32 *dst = (uint32 *)outSurf->getBasePtr(dirtyArea.left, dirtyArea.top);
+	const uint dstAdd = outSurf->pitch - 4 * dirtyArea.width();
+
+	const uint32 *src = (const uint32 *)_rgbData.getBasePtr(dirtyArea.left, dirtyArea.top);
+	const uint srcAdd = _rgbData.pitch - 4 * dirtyArea.width();
+
+	for (int height = dirtyArea.height(); height > 0; --height) {
+		for (int width = dirtyArea.width(); width > 0; --width) {
+			const uint32 color = *src++;
+
+			*dst++ = SWAP_BYTES_32(color);
+		}
+
+		src = (const uint32 *)((const byte *)src + srcAdd);
+		dst = (uint32 *)((byte *)dst + dstAdd);
+	}
+
+	// Do generic handling of updating the texture.
+	Texture::updateGLTexture();
+}
 #endif // !USE_FORCED_GL
 
 #if !USE_FORCED_GLES
diff --git a/backends/graphics/opengl/texture.h b/backends/graphics/opengl/texture.h
index 3be09cb9f9..81adc384b9 100644
--- a/backends/graphics/opengl/texture.h
+++ b/backends/graphics/opengl/texture.h
@@ -319,21 +319,39 @@ private:
 };
 
 #if !USE_FORCED_GL
-class TextureRGB555 : public Texture {
+class FakeTexture : public Texture {
 public:
-	TextureRGB555();
-	virtual ~TextureRGB555();
+	FakeTexture(GLenum glIntFormat, GLenum glFormat, GLenum glType, const Graphics::PixelFormat &format);
+	virtual ~FakeTexture();
 
 	virtual void allocate(uint width, uint height);
 
+	virtual Graphics::PixelFormat getFormat() const = 0;
+
+	virtual Graphics::Surface *getSurface() { return &_rgbData; }
+	virtual const Graphics::Surface *getSurface() const { return &_rgbData; }
+protected:
+	Graphics::Surface _rgbData;
+};
+
+class TextureRGB555 : public FakeTexture {
+public:
+	TextureRGB555();
+	virtual ~TextureRGB555() {};
+
 	virtual Graphics::PixelFormat getFormat() const;
 
-	virtual Graphics::Surface *getSurface() { return &_rgb555Data; }
-	virtual const Graphics::Surface *getSurface() const { return &_rgb555Data; }
+	virtual void updateGLTexture();
+};
 
-	virtual void updateTexture();
-private:
-	Graphics::Surface _rgb555Data;
+class TextureRGBA8888Swap : public FakeTexture {
+public:
+	TextureRGBA8888Swap();
+	virtual ~TextureRGBA8888Swap() {};
+
+	virtual Graphics::PixelFormat getFormat() const;
+
+	virtual void updateGLTexture();
 };
 #endif // !USE_FORCED_GL