st/mesa: add support for GL_RGBA + GL_UNSIGNED_INT_8_8_8_8 in st_fast_readpixels

Signed-off-by: Brian Paul <brianp@vmware.com>

diff --git a/src/mesa/state_tracker/st_cb_readpixels.c b/src/mesa/state_tracker/st_cb_readpixels.c
index 03f58bf0fc4ae3626e39b782c24c94f5446cef05..fdb7770e446dc8eaec124c4f9f5c50a7ca350371 100644 (file)
--- a/src/mesa/state_tracker/st_cb_readpixels.c
+++ b/src/mesa/state_tracker/st_cb_readpixels.c
@@ -201,7 +201,8 @@ st_fast_readpixels(struct gl_context *ctx, struct st_renderbuffer *strb,
    enum combination {
       A8R8G8B8_UNORM_TO_RGBA_UBYTE,
       A8R8G8B8_UNORM_TO_RGB_UBYTE,
-      A8R8G8B8_UNORM_TO_BGRA_UINT
+      A8R8G8B8_UNORM_TO_BGRA_UINT,
+      A8R8G8B8_UNORM_TO_RGBA_UINT
    } combo;
 
    if (ctx->_ImageTransferState)
@@ -219,6 +220,10 @@ st_fast_readpixels(struct gl_context *ctx, struct st_renderbuffer *strb,
             format == GL_BGRA && type == GL_UNSIGNED_INT_8_8_8_8_REV) {
       combo = A8R8G8B8_UNORM_TO_BGRA_UINT;
    }
+   else if (strb->format == PIPE_FORMAT_B8G8R8A8_UNORM &&
+            format == GL_RGBA && type == GL_UNSIGNED_INT_8_8_8_8) {
+      combo = A8R8G8B8_UNORM_TO_RGBA_UINT;
+   }
    else {
       return GL_FALSE;
    }
@@ -305,6 +310,20 @@ st_fast_readpixels(struct gl_context *ctx, struct st_renderbuffer *strb,
             y += dy;
          }
          break;
+      case A8R8G8B8_UNORM_TO_RGBA_UINT:
+         for (row = 0; row < height; row++) {
+            const GLubyte *src = map + y * trans->stride;
+            for (col = 0; col < width; col++) {
+               GLuint pixel = ((GLuint *) src)[col];
+               dst[col*4+0] = (pixel >> 24) & 0xff;
+               dst[col*4+1] = (pixel >> 0) & 0xff;
+               dst[col*4+2] = (pixel >> 8) & 0xff;
+               dst[col*4+3] = (pixel >> 16) & 0xff;
+            }
+            dst += dstStride;
+            y += dy;
+         }
+         break;
       default:
          ; /* nothing */
       }