- /* top clipping */
- if (*y + *height > buffer->_Ymax)
- *height -= (*y + *height - buffer->_Ymax - 1);
-
- if (*height <= 0)
- return GL_FALSE;
-
- return GL_TRUE;
-}
-
-
-/**
- * Compute intersection of a clipping rectangle and pixel rectangle,
- * returning results in x/y/w/hOut vars.
- * \return GL_TRUE if there's intersection, GL_FALSE if disjoint.
- */
-static INLINE GLboolean
-intersect_region(const drm_clip_rect_t *box,
- GLint x, GLint y, GLsizei width, GLsizei height,
- GLint *xOut, GLint *yOut, GLint *wOut, GLint *hOut)
-{
- GLint bx = box->x1;
- GLint by = box->y1;
- GLint bw = box->x2 - bx;
- GLint bh = box->y2 - by;
-
- if (bx < x) bw -= x - bx, bx = x;
- if (by < y) bh -= y - by, by = y;
- if (bx + bw > x + width) bw = x + width - bx;
- if (by + bh > y + height) bh = y + height - by;
-
- *xOut = bx;
- *yOut = by;
- *wOut = bw;
- *hOut = bh;
-
- if (bw <= 0) return GL_FALSE;
- if (bh <= 0) return GL_FALSE;
-
- return GL_TRUE;
-}
-
-
-
-static GLboolean
-intelTryReadPixels( GLcontext *ctx,
- GLint x, GLint y, GLsizei width, GLsizei height,
- GLenum format, GLenum type,
- const struct gl_pixelstore_attrib *pack,
- GLvoid *pixels )
-{
- intelContextPtr intel = INTEL_CONTEXT(ctx);
- GLint size = 0; /* not really used */
- GLint pitch = pack->RowLength ? pack->RowLength : width;
-
- if (INTEL_DEBUG & DEBUG_PIXEL)
- fprintf(stderr, "%s\n", __FUNCTION__);
-
- /* Only accelerate reading to agp buffers.
- */
- if ( !intelIsAgpMemory(intel, pixels,
- pitch * height * intel->intelScreen->cpp ) ) {
- if (INTEL_DEBUG & DEBUG_PIXEL)
- fprintf(stderr, "%s: dest not agp\n", __FUNCTION__);
- return GL_FALSE;
+ if (ctx->Color.BlendEnabled &&
+ (effective_func(ctx->Color.Blend[0].SrcRGB, src_alpha_is_one) != GL_ONE ||
+ effective_func(ctx->Color.Blend[0].DstRGB, src_alpha_is_one) != GL_ZERO ||
+ ctx->Color.Blend[0].EquationRGB != GL_FUNC_ADD ||
+ effective_func(ctx->Color.Blend[0].SrcA, src_alpha_is_one) != GL_ONE ||
+ effective_func(ctx->Color.Blend[0].DstA, src_alpha_is_one) != GL_ZERO ||
+ ctx->Color.Blend[0].EquationA != GL_FUNC_ADD)) {
+ DBG("fallback due to blend\n");
+ return false;