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/*
* Copyright © 2009 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Eric Anholt <eric@anholt.net>
*
*/
#include "brw_context.h"
#include "brw_state.h"
#include "brw_defines.h"
#include "intel_batchbuffer.h"
#include "main/fbobject.h"
#include "main/framebuffer.h"
static void
gen6_upload_scissor_state(struct brw_context *brw)
{
struct gl_context *ctx = &brw->ctx;
const bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
struct gen6_scissor_rect *scissor;
uint32_t scissor_state_offset;
const unsigned int fb_width= _mesa_geometric_width(ctx->DrawBuffer);
const unsigned int fb_height = _mesa_geometric_height(ctx->DrawBuffer);
scissor = brw_state_batch(brw, AUB_TRACE_SCISSOR_STATE,
sizeof(*scissor) * ctx->Const.MaxViewports, 32,
&scissor_state_offset);
/* _NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT */
/* The scissor only needs to handle the intersection of drawable and
* scissor rect. Clipping to the boundaries of static shared buffers
* for front/back/depth is covered by looping over cliprects in brw_draw.c.
*
* Note that the hardware's coordinates are inclusive, while Mesa's min is
* inclusive but max is exclusive.
*/
for (unsigned i = 0; i < ctx->Const.MaxViewports; i++) {
int bbox[4];
bbox[0] = 0;
bbox[1] = fb_width;
bbox[2] = 0;
bbox[3] = fb_height;
_mesa_intersect_scissor_bounding_box(ctx, i, bbox);
if (bbox[0] == bbox[1] || bbox[2] == bbox[3]) {
/* If the scissor was out of bounds and got clamped to 0 width/height
* at the bounds, the subtraction of 1 from maximums could produce a
* negative number and thus not clip anything. Instead, just provide
* a min > max scissor inside the bounds, which produces the expected
* no rendering.
*/
scissor[i].xmin = 1;
scissor[i].xmax = 0;
scissor[i].ymin = 1;
scissor[i].ymax = 0;
} else if (render_to_fbo) {
/* texmemory: Y=0=bottom */
scissor[i].xmin = bbox[0];
scissor[i].xmax = bbox[1] - 1;
scissor[i].ymin = bbox[2];
scissor[i].ymax = bbox[3] - 1;
}
else {
/* memory: Y=0=top */
scissor[i].xmin = bbox[0];
scissor[i].xmax = bbox[1] - 1;
scissor[i].ymin = fb_height - bbox[3];
scissor[i].ymax = fb_height - bbox[2] - 1;
}
}
BEGIN_BATCH(2);
OUT_BATCH(_3DSTATE_SCISSOR_STATE_POINTERS << 16 | (2 - 2));
OUT_BATCH(scissor_state_offset);
ADVANCE_BATCH();
}
const struct brw_tracked_state gen6_scissor_state = {
.dirty = {
.mesa = _NEW_BUFFERS |
_NEW_SCISSOR |
_NEW_VIEWPORT,
.brw = BRW_NEW_BATCH,
},
.emit = gen6_upload_scissor_state,
};
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