Fast path for BGRA to RGBA readPixels conversions.
From http://code.google.com/p/angleproject/source/detail?r=1999
TRAC #22825
Signed-off-by: Geoff Lang
Signed-off-by: Shannon Woods
Author: Jamie Madill
git-svn-id: https://angleproject.googlecode.com/svn/branches/es3proto@2104 736b8ea6-26fd-11df-bfd4-992fa37f6226
diff --git a/src/libGLESv2/renderer/Renderer11.cpp b/src/libGLESv2/renderer/Renderer11.cpp
index 3cbdd5d..c209013 100644
--- a/src/libGLESv2/renderer/Renderer11.cpp
+++ b/src/libGLESv2/renderer/Renderer11.cpp
@@ -3386,6 +3386,25 @@
memcpy(dest + j * outputPitch, source + j * inputPitch, area.width * fastPixelSize);
}
}
+ else if (textureDesc.Format == DXGI_FORMAT_B8G8R8A8_UNORM &&
+ format == GL_RGBA &&
+ type == GL_UNSIGNED_BYTE)
+ {
+ // Fast path for swapping red with blue
+ unsigned char *dest = static_cast<unsigned char*>(pixels);
+
+ for (int j = 0; j < area.height; j++)
+ {
+ for (int i = 0; i < area.width; i++)
+ {
+ unsigned int argb = *(unsigned int*)(source + 4 * i + j * inputPitch);
+ *(unsigned int*)(dest + 4 * i + j * outputPitch) =
+ (argb & 0xFF00FF00) | // Keep alpha and green
+ (argb & 0x00FF0000) >> 16 | // Move red to blue
+ (argb & 0x000000FF) << 16; // Move blue to red
+ }
+ }
+ }
else
{
gl::Color pixelColor;