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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"
#include "main/viewport.h"
/* The clip VP defines the guardband region where expensive clipping is skipped
* and fragments are allowed to be generated and clipped out cheaply by the SF.
*/
static void
gen6_upload_clip_vp(struct brw_context *brw)
{
struct gl_context *ctx = &brw->ctx;
struct brw_clipper_viewport *vp;
vp = brw_state_batch(brw, AUB_TRACE_CLIP_VP_STATE,
sizeof(*vp) * ctx->Const.MaxViewports, 32, &brw->clip.vp_offset);
for (unsigned i = 0; i < ctx->Const.MaxViewports; i++) {
/* 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_post_clamp_delta = 8192;
float gbx = maximum_post_clamp_delta / ctx->ViewportArray[i].Width;
float gby = maximum_post_clamp_delta / ctx->ViewportArray[i].Height;
vp[i].xmin = -gbx;
vp[i].xmax = gbx;
vp[i].ymin = -gby;
vp[i].ymax = gby;
}
brw->ctx.NewDriverState |= BRW_NEW_CLIP_VP;
}
const struct brw_tracked_state gen6_clip_vp = {
.dirty = {
.mesa = _NEW_VIEWPORT,
.brw = BRW_NEW_BATCH,
},
.emit = gen6_upload_clip_vp,
};
static void
gen6_upload_sf_vp(struct brw_context *brw)
{
struct gl_context *ctx = &brw->ctx;
struct gen6_sf_viewport *sfv;
GLfloat y_scale, y_bias;
const bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
sfv = brw_state_batch(brw, AUB_TRACE_SF_VP_STATE,
sizeof(*sfv) * ctx->Const.MaxViewports,
32, &brw->sf.vp_offset);
memset(sfv, 0, sizeof(*sfv) * ctx->Const.MaxViewports);
/* _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 < ctx->Const.MaxViewports; i++) {
float scale[3], translate[3];
/* _NEW_VIEWPORT */
_mesa_get_viewport_xform(ctx, i, scale, translate);
sfv[i].m00 = scale[0];
sfv[i].m11 = scale[1] * y_scale;
sfv[i].m22 = scale[2];
sfv[i].m30 = translate[0];
sfv[i].m31 = translate[1] * y_scale + y_bias;
sfv[i].m32 = translate[2];
}
brw->ctx.NewDriverState |= BRW_NEW_SF_VP;
}
const struct brw_tracked_state gen6_sf_vp = {
.dirty = {
.mesa = _NEW_BUFFERS |
_NEW_VIEWPORT,
.brw = BRW_NEW_BATCH,
},
.emit = gen6_upload_sf_vp,
};
static void upload_viewport_state_pointers(struct brw_context *brw)
{
BEGIN_BATCH(4);
OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS << 16 | (4 - 2) |
GEN6_CC_VIEWPORT_MODIFY |
GEN6_SF_VIEWPORT_MODIFY |
GEN6_CLIP_VIEWPORT_MODIFY);
OUT_BATCH(brw->clip.vp_offset);
OUT_BATCH(brw->sf.vp_offset);
OUT_BATCH(brw->cc.vp_offset);
ADVANCE_BATCH();
}
const struct brw_tracked_state gen6_viewport_state = {
.dirty = {
.mesa = 0,
.brw = BRW_NEW_BATCH |
BRW_NEW_CC_VP |
BRW_NEW_CLIP_VP |
BRW_NEW_SF_VP |
BRW_NEW_STATE_BASE_ADDRESS,
},
.emit = upload_viewport_state_pointers,
};
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