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/*
* Copyright © 2011 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.
*/
#include "brw_context.h"
#include "brw_state.h"
#include "brw_defines.h"
#include "intel_batchbuffer.h"
#include "main/fbobject.h"
#include "main/framebuffer.h"
#include "main/viewport.h"
static void
gen7_upload_sf_clip_viewport(struct brw_context *brw)
{
struct gl_context *ctx = &brw->ctx;
GLfloat y_scale, y_bias;
const bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
struct gen7_sf_clip_viewport *vp;
/* BRW_NEW_VIEWPORT_COUNT */
const unsigned viewport_count = brw->clip.viewport_count;
vp = brw_state_batch(brw, AUB_TRACE_SF_VP_STATE,
sizeof(*vp) * viewport_count, 64,
&brw->sf.vp_offset);
/* Also assign to clip.vp_offset in case something uses it. */
brw->clip.vp_offset = brw->sf.vp_offset;
/* _NEW_BUFFERS */
if (render_to_fbo) {
y_scale = 1.0;
y_bias = 0.0;
} else {
y_scale = -1.0;
y_bias = (float)_mesa_geometric_height(ctx->DrawBuffer);
}
for (unsigned i = 0; i < viewport_count; i++) {
float scale[3], translate[3];
_mesa_get_viewport_xform(ctx, i, scale, translate);
/* According to the "Vertex X,Y Clamping and Quantization" section of
* the Strips and Fans documentation, objects must not have a
* screen-space extents of over 8192 pixels, or they may be
* mis-rasterized. The maximum screen space coordinates of a small
* object may larger, but we have no way to enforce the object size
* other than through clipping.
*
* If you're surprised that we set clip to -gbx to +gbx and it seems
* like we'll end up with 16384 wide, note that for a 8192-wide render
* target, we'll end up with a normal (-1, 1) clip volume that just
* covers the drawable.
*/
const float maximum_guardband_extent = 8192;
const float gbx = maximum_guardband_extent / ctx->ViewportArray[i].Width;
const float gby = maximum_guardband_extent / ctx->ViewportArray[i].Height;
vp[i].guardband.xmin = -gbx;
vp[i].guardband.xmax = gbx;
vp[i].guardband.ymin = -gby;
vp[i].guardband.ymax = gby;
/* _NEW_VIEWPORT */
vp[i].viewport.m00 = scale[0];
vp[i].viewport.m11 = scale[1] * y_scale;
vp[i].viewport.m22 = scale[2];
vp[i].viewport.m30 = translate[0];
vp[i].viewport.m31 = translate[1] * y_scale + y_bias;
vp[i].viewport.m32 = translate[2];
}
BEGIN_BATCH(2);
OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS_SF_CL << 16 | (2 - 2));
OUT_BATCH(brw->sf.vp_offset);
ADVANCE_BATCH();
}
const struct brw_tracked_state gen7_sf_clip_viewport = {
.dirty = {
.mesa = _NEW_BUFFERS |
_NEW_VIEWPORT,
.brw = BRW_NEW_BATCH |
BRW_NEW_BLORP |
BRW_NEW_VIEWPORT_COUNT,
},
.emit = gen7_upload_sf_clip_viewport,
};
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