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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 "brw_util.h"
#include "intel_batchbuffer.h"
/**
* Return true if at least one of the inputs used by the given fragment
* program has the GLSL "noperspective" interpolation qualifier.
*/
bool
brw_fprog_uses_noperspective(const struct gl_fragment_program *fprog)
{
int attr;
for (attr = 0; attr < FRAG_ATTRIB_MAX; ++attr) {
/* Ignore unused inputs. */
if (!(fprog->Base.InputsRead & BITFIELD64_BIT(attr)))
continue;
if (fprog->InterpQualifier[attr] == INTERP_QUALIFIER_NOPERSPECTIVE)
return true;
}
return false;
}
static void
upload_clip_state(struct brw_context *brw)
{
struct intel_context *intel = &brw->intel;
struct gl_context *ctx = &intel->ctx;
uint32_t depth_clamp = 0;
uint32_t provoking, userclip;
uint32_t nonperspective_barycentric_enable_flag = 0;
/* BRW_NEW_FRAGMENT_PROGRAM */
const struct gl_fragment_program *fprog = brw->fragment_program;
if (brw_fprog_uses_noperspective(fprog)) {
nonperspective_barycentric_enable_flag =
GEN6_CLIP_NON_PERSPECTIVE_BARYCENTRIC_ENABLE;
}
if (brw->hiz.op) {
/* HiZ operations emit a rectangle primitive, which requires clipping to
* be disabled. From page 10 of the Sandy Bridge PRM Volume 2 Part 1
* Section 1.3 3D Primitives Overview:
* RECTLIST:
* Either the CLIP unit should be DISABLED, or the CLIP unit's Clip
* Mode should be set to a value other than CLIPMODE_NORMAL.
*/
BEGIN_BATCH(4);
OUT_BATCH(_3DSTATE_CLIP << 16 | (4 - 2));
OUT_BATCH(0);
OUT_BATCH(0);
OUT_BATCH(0);
ADVANCE_BATCH();
return;
}
if (!ctx->Transform.DepthClamp)
depth_clamp = GEN6_CLIP_Z_TEST;
/* _NEW_LIGHT */
if (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION) {
provoking =
(0 << GEN6_CLIP_TRI_PROVOKE_SHIFT) |
(1 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) |
(0 << GEN6_CLIP_LINE_PROVOKE_SHIFT);
} else {
provoking =
(2 << GEN6_CLIP_TRI_PROVOKE_SHIFT) |
(2 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) |
(1 << GEN6_CLIP_LINE_PROVOKE_SHIFT);
}
/* _NEW_TRANSFORM */
userclip = ctx->Transform.ClipPlanesEnabled;
BEGIN_BATCH(4);
OUT_BATCH(_3DSTATE_CLIP << 16 | (4 - 2));
OUT_BATCH(GEN6_CLIP_STATISTICS_ENABLE);
OUT_BATCH(GEN6_CLIP_ENABLE |
GEN6_CLIP_API_OGL |
GEN6_CLIP_MODE_NORMAL |
nonperspective_barycentric_enable_flag |
GEN6_CLIP_XY_TEST |
userclip << GEN6_USER_CLIP_CLIP_DISTANCES_SHIFT |
depth_clamp |
provoking);
OUT_BATCH(U_FIXED(0.125, 3) << GEN6_CLIP_MIN_POINT_WIDTH_SHIFT |
U_FIXED(255.875, 3) << GEN6_CLIP_MAX_POINT_WIDTH_SHIFT |
GEN6_CLIP_FORCE_ZERO_RTAINDEX);
ADVANCE_BATCH();
}
const struct brw_tracked_state gen6_clip_state = {
.dirty = {
.mesa = _NEW_TRANSFORM | _NEW_LIGHT,
.brw = (BRW_NEW_CONTEXT |
BRW_NEW_FRAGMENT_PROGRAM |
BRW_NEW_HIZ),
.cache = 0
},
.emit = upload_clip_state,
};
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