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scissor depends on glScissor() and framebuffer size

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This commit is contained in:
Brian 2007-05-24 16:48:38 -06:00
parent 3bf0fd6090
commit 9267341bd0
1 changed files with 28 additions and 9 deletions
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37
src/mesa/softpipe/state_tracker/st_atom_scissor.c
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@ -36,28 +36,47 @@
#include "st_atom.h"
/* scissor state
/**
* Scissor depends on the scissor box, and the framebuffer dimensions.
*/
static void update_scissor( struct st_context *st )
static void
update_scissor( struct st_context *st )
{
struct softpipe_scissor_rect scissor;
const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
scissor.minx = 0;
scissor.miny = 0;
scissor.maxx = fb->Width;
scissor.maxy = fb->Height;
if (st->ctx->Scissor.Enabled) {
if (st->ctx->Scissor.X > scissor.minx)
scissor.minx = st->ctx->Scissor.X;
if (st->ctx->Scissor.Y > scissor.miny)
scissor.miny = st->ctx->Scissor.Y;
if (st->ctx->Scissor.X + st->ctx->Scissor.Width < scissor.maxx)
scissor.maxx = st->ctx->Scissor.X + st->ctx->Scissor.Width;
if (st->ctx->Scissor.Y + st->ctx->Scissor.Height < scissor.maxy)
scissor.maxy = st->ctx->Scissor.Y + st->ctx->Scissor.Height;
/* check for null space */
if (scissor.minx >= scissor.maxx || scissor.miny >= scissor.maxy)
scissor.minx = scissor.miny = scissor.maxx = scissor.maxy = 0;
}
scissor.minx = st->ctx->Scissor.X;
scissor.miny = st->ctx->Scissor.Y;
scissor.maxx = st->ctx->Scissor.X + st->ctx->Scissor.Width;
scissor.maxy = st->ctx->Scissor.Y + st->ctx->Scissor.Height;
if (memcmp(&scissor, &st->state.scissor, sizeof(scissor)) != 0) {
/* state has changed */
st->state.scissor = scissor; /* struct copy */
st->softpipe->set_scissor_rect(st->softpipe, &scissor); /* set new state */
st->softpipe->set_scissor_rect(st->softpipe, &scissor); /* activate */
}
}
const struct st_tracked_state st_update_scissor = {
.dirty = {
.mesa = (_NEW_SCISSOR),
.mesa = (_NEW_SCISSOR | _NEW_BUFFERS),
.st = 0,
},
.update = update_scissor