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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
gen8_upload_sf_clip_viewport(struct brw_context *brw)
{
struct gl_context *ctx = &brw->ctx;
float y_scale, y_bias;
const float fb_height = (float)_mesa_geometric_height(ctx->DrawBuffer);
const bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
float *vp = brw_state_batch(brw, AUB_TRACE_SF_VP_STATE,
16 * 4 * ctx->Const.MaxViewports,
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;
} else {
y_scale = -1.0;
y_bias = fb_height;
}
for (unsigned i = 0; i < ctx->Const.MaxViewports; i++) {
double scale[3], translate[3];
_mesa_get_viewport_xform(ctx, i, scale, translate);
/* _NEW_VIEWPORT: Viewport Matrix Elements */
vp[0] = scale[0]; /* m00 */
vp[1] = scale[1] * y_scale; /* m11 */
vp[2] = scale[2]; /* m22 */
vp[3] = translate[0]; /* m30 */
vp[4] = translate[1] * y_scale + y_bias; /* m31 */
vp[5] = translate[2]; /* m32 */
/* Reserved */
vp[6] = 0;
vp[7] = 0;
/* 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.
*
* The goal is to create the maximum sized guardband (8K x 8K) with the
* viewport rectangle in the center of the guardband. This looks weird
* because the hardware wants coordinates that are scaled to the viewport
* in NDC. In other words, an 8K x 8K viewport would have [-1,1] for X and Y.
* A 4K viewport would be [-2,2], 2K := [-4,4] etc.
*
* --------------------------------
* |Guardband |
* | |
* | ------------ |
* | |viewport | |
* | | | |
* | | | |
* | |__________| |
* | |
* | |
* |______________________________|
*
*/
const float maximum_guardband_extent = 8192;
float gbx = maximum_guardband_extent / ctx->ViewportArray[i].Width;
float gby = maximum_guardband_extent / ctx->ViewportArray[i].Height;
/* _NEW_VIEWPORT: Guardband Clipping */
vp[8] = -gbx; /* x-min */
vp[9] = gbx; /* x-max */
vp[10] = -gby; /* y-min */
vp[11] = gby; /* y-max */
/* _NEW_VIEWPORT | _NEW_BUFFERS: Screen Space Viewport
* The hardware will take the intersection of the drawing rectangle,
* scissor rectangle, and the viewport extents. We don't need to be
* smart, and can therefore just program the viewport extents.
*/
float viewport_Xmax = ctx->ViewportArray[i].X + ctx->ViewportArray[i].Width;
float viewport_Ymax = ctx->ViewportArray[i].Y + ctx->ViewportArray[i].Height;
if (render_to_fbo) {
vp[12] = ctx->ViewportArray[i].X;
vp[13] = viewport_Xmax - 1;
vp[14] = ctx->ViewportArray[i].Y;
vp[15] = viewport_Ymax - 1;
} else {
vp[12] = ctx->ViewportArray[i].X;
vp[13] = viewport_Xmax - 1;
vp[14] = fb_height - viewport_Ymax;
vp[15] = fb_height - ctx->ViewportArray[i].Y - 1;
}
vp += 16;
}
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 gen8_sf_clip_viewport = {
.dirty = {
.mesa = _NEW_BUFFERS |
_NEW_VIEWPORT,
.brw = BRW_NEW_BATCH,
},
.emit = gen8_upload_sf_clip_viewport,
};
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