-
-/* =============================================================
- * Scissoring
- */
-
-
-static GLboolean intersect_rect( XF86DRIClipRectPtr out,
- XF86DRIClipRectPtr a,
- XF86DRIClipRectPtr b )
-{
- *out = *a;
- if ( b->x1 > out->x1 ) out->x1 = b->x1;
- if ( b->y1 > out->y1 ) out->y1 = b->y1;
- if ( b->x2 < out->x2 ) out->x2 = b->x2;
- if ( b->y2 < out->y2 ) out->y2 = b->y2;
- if ( out->x1 >= out->x2 ) return GL_FALSE;
- if ( out->y1 >= out->y2 ) return GL_FALSE;
- return GL_TRUE;
-}
-
-
-void radeonRecalcScissorRects( radeonContextPtr rmesa )
-{
- XF86DRIClipRectPtr out;
- int i;
-
- /* Grow cliprect store?
- */
- if (rmesa->state.scissor.numAllocedClipRects < rmesa->numClipRects) {
- while (rmesa->state.scissor.numAllocedClipRects < rmesa->numClipRects) {
- rmesa->state.scissor.numAllocedClipRects += 1; /* zero case */
- rmesa->state.scissor.numAllocedClipRects *= 2;
- }
-
- if (rmesa->state.scissor.pClipRects)
- FREE(rmesa->state.scissor.pClipRects);
-
- rmesa->state.scissor.pClipRects =
- MALLOC( rmesa->state.scissor.numAllocedClipRects *
- sizeof(XF86DRIClipRectRec) );
-
- if ( rmesa->state.scissor.pClipRects == NULL ) {
- rmesa->state.scissor.numAllocedClipRects = 0;
- return;
- }
- }
-
- out = rmesa->state.scissor.pClipRects;
- rmesa->state.scissor.numClipRects = 0;
-
- for ( i = 0 ; i < rmesa->numClipRects ; i++ ) {
- if ( intersect_rect( out,
- &rmesa->pClipRects[i],
- &rmesa->state.scissor.rect ) ) {
- rmesa->state.scissor.numClipRects++;
- out++;
- }
- }
-}
-
-
-static void radeonUpdateScissor( GLcontext *ctx )
-{
- radeonContextPtr rmesa = RADEON_CONTEXT(ctx);
-
- if ( rmesa->dri.drawable ) {
- __DRIdrawablePrivate *dPriv = rmesa->dri.drawable;
-
- int x = ctx->Scissor.X;
- int y = dPriv->h - ctx->Scissor.Y - ctx->Scissor.Height;
- int w = ctx->Scissor.X + ctx->Scissor.Width - 1;
- int h = dPriv->h - ctx->Scissor.Y - 1;
-
- rmesa->state.scissor.rect.x1 = x + dPriv->x;
- rmesa->state.scissor.rect.y1 = y + dPriv->y;
- rmesa->state.scissor.rect.x2 = w + dPriv->x + 1;
- rmesa->state.scissor.rect.y2 = h + dPriv->y + 1;
-
- radeonRecalcScissorRects( rmesa );
- }
-}
-
-
-static void radeonScissor( GLcontext *ctx,
- GLint x, GLint y, GLsizei w, GLsizei h )
-{
- radeonContextPtr rmesa = RADEON_CONTEXT(ctx);
-
- if ( ctx->Scissor.Enabled ) {
- RADEON_FIREVERTICES( rmesa ); /* don't pipeline cliprect changes */
- radeonUpdateScissor( ctx );
- }
-
-}
-
-