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radeon: fix scissor calcs.

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For non-FBOs we need to invert, for FBOs the scissors are non-inverted.

no matter what we need to clamp them to the buffer sizes.
This commit is contained in:
Dave Airlie 2009-08-27 15:36:35 +10:00 • committed by Dave Airlie
parent 09c73c7437
commit 82ff3190de
1 changed files with 20 additions and 15 deletions
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35
src/mesa/drivers/dri/radeon/radeon_common.c
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@ -231,26 +231,31 @@ void radeonSetCliprects(radeonContextPtr radeon)
void radeonUpdateScissor( GLcontext *ctx )
{
radeonContextPtr rmesa = RADEON_CONTEXT(ctx);
GLint x = ctx->Scissor.X, y = ctx->Scissor.Y;
GLsizei w = ctx->Scissor.Width, h = ctx->Scissor.Height;
int x1, y1, x2, y2;
if (!ctx->DrawBuffer)
return;
if ( !ctx->DrawBuffer->Name ) {
__DRIdrawablePrivate *dPriv = radeon_get_drawable(rmesa);
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;
x1 = x;
y1 = ctx->DrawBuffer->Height - (y + h);
x2 = x + w - 1;
y2 = y1 + h - 1;
} else {
rmesa->state.scissor.rect.x1 = ctx->Scissor.X;
rmesa->state.scissor.rect.y1 = ctx->Scissor.Y;
rmesa->state.scissor.rect.x2 = ctx->Scissor.X + ctx->Scissor.Width;
rmesa->state.scissor.rect.y2 = ctx->Scissor.Y + ctx->Scissor.Height;
x1 = x;
y1 = y;
x2 = x + w - 1;
y2 = y + h - 1;
}
rmesa->state.scissor.rect.x1 = CLAMP(x1, 0, ctx->DrawBuffer->Width - 1);
rmesa->state.scissor.rect.y1 = CLAMP(y1, 0, ctx->DrawBuffer->Height - 1);
rmesa->state.scissor.rect.x2 = CLAMP(x2, 0, ctx->DrawBuffer->Width - 1);
rmesa->state.scissor.rect.y2 = CLAMP(y2, 0, ctx->DrawBuffer->Height - 1);
radeonRecalcScissorRects( rmesa );
}