Implement EXT_texture_format_BGRA8888 and EXT_read_format_bgra
Trac #13050, Issue=21
Original Author: Vladimir Vukicevic
Signed-off-by: Daniel Koch
git-svn-id: https://angleproject.googlecode.com/svn/trunk@370 736b8ea6-26fd-11df-bfd4-992fa37f6226
diff --git a/src/libGLESv2/Context.cpp b/src/libGLESv2/Context.cpp
index 2eb592e..f711be0 100644
--- a/src/libGLESv2/Context.cpp
+++ b/src/libGLESv2/Context.cpp
@@ -1945,6 +1945,19 @@
for (int j = 0; j < rect.bottom - rect.top; j++)
{
+ if (desc.Format == D3DFMT_A8R8G8B8 &&
+ format == GL_BGRA_EXT &&
+ type == GL_UNSIGNED_BYTE)
+ {
+ // Fast path for EXT_read_format_bgra, given
+ // an RGBA source buffer. Note that buffers with no
+ // alpha go through the slow path below.
+ memcpy(dest + j * outputPitch,
+ source + j * lock.Pitch,
+ (rect.right - rect.left) * 4);
+ continue;
+ }
+
for (int i = 0; i < rect.right - rect.left; i++)
{
float r;
@@ -2033,6 +2046,46 @@
default: UNREACHABLE();
}
break;
+ case GL_BGRA_EXT:
+ switch (type)
+ {
+ case GL_UNSIGNED_BYTE:
+ dest[4 * i + j * outputPitch + 0] = (unsigned char)(255 * b + 0.5f);
+ dest[4 * i + j * outputPitch + 1] = (unsigned char)(255 * g + 0.5f);
+ dest[4 * i + j * outputPitch + 2] = (unsigned char)(255 * r + 0.5f);
+ dest[4 * i + j * outputPitch + 3] = (unsigned char)(255 * a + 0.5f);
+ break;
+ case GL_UNSIGNED_SHORT_4_4_4_4_REV_EXT:
+ // According to the desktop GL spec in the "Transfer of Pixel Rectangles" section
+ // this type is packed as follows:
+ // 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
+ // --------------------------------------------------------------------------------
+ // | 4th | 3rd | 2nd | 1st component |
+ // --------------------------------------------------------------------------------
+ // in the case of BGRA_EXT, B is the first component, G the second, and so forth.
+ dest16[i + j * outputPitch / sizeof(unsigned short)] =
+ ((unsigned short)(15 * a + 0.5f) << 12)|
+ ((unsigned short)(15 * r + 0.5f) << 8) |
+ ((unsigned short)(15 * g + 0.5f) << 4) |
+ ((unsigned short)(15 * b + 0.5f) << 0);
+ break;
+ case GL_UNSIGNED_SHORT_1_5_5_5_REV_EXT:
+ // According to the desktop GL spec in the "Transfer of Pixel Rectangles" section
+ // this type is packed as follows:
+ // 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
+ // --------------------------------------------------------------------------------
+ // | 4th | 3rd | 2nd | 1st component |
+ // --------------------------------------------------------------------------------
+ // in the case of BGRA_EXT, B is the first component, G the second, and so forth.
+ dest16[i + j * outputPitch / sizeof(unsigned short)] =
+ ((unsigned short)( a + 0.5f) << 15) |
+ ((unsigned short)(31 * r + 0.5f) << 10) |
+ ((unsigned short)(31 * g + 0.5f) << 5) |
+ ((unsigned short)(31 * b + 0.5f) << 0);
+ break;
+ default: UNREACHABLE();
+ }
+ break;
case GL_RGB: // IMPLEMENTATION_COLOR_READ_FORMAT
switch (type)
{
@@ -2730,6 +2783,8 @@
void Context::initExtensionString()
{
mExtensionString += "GL_OES_packed_depth_stencil ";
+ mExtensionString += "GL_EXT_texture_format_BGRA8888 ";
+ mExtensionString += "GL_EXT_read_format_bgra ";
if (mBufferBackEnd->supportIntIndices())
{