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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"
#include "main/fbobject.h"
#include "main/framebuffer.h"
bool
brw_is_drawing_points(const struct brw_context *brw)
{
/* Determine if the primitives *reaching the SF* are points */
/* _NEW_POLYGON */
if (brw->ctx.Polygon.FrontMode == GL_POINT ||
brw->ctx.Polygon.BackMode == GL_POINT) {
return true;
}
if (brw->gs.base.prog_data) {
/* BRW_NEW_GS_PROG_DATA */
return brw_gs_prog_data(brw->gs.base.prog_data)->output_topology ==
_3DPRIM_POINTLIST;
} else if (brw->tes.base.prog_data) {
/* BRW_NEW_TES_PROG_DATA */
return brw_tes_prog_data(brw->tes.base.prog_data)->output_topology ==
BRW_TESS_OUTPUT_TOPOLOGY_POINT;
} else {
/* BRW_NEW_PRIMITIVE */
return brw->primitive == _3DPRIM_POINTLIST;
}
}
bool
brw_is_drawing_lines(const struct brw_context *brw)
{
/* Determine if the primitives *reaching the SF* are points */
/* _NEW_POLYGON */
if (brw->ctx.Polygon.FrontMode == GL_LINE ||
brw->ctx.Polygon.BackMode == GL_LINE) {
return true;
}
if (brw->gs.base.prog_data) {
/* BRW_NEW_GS_PROG_DATA */
return brw_gs_prog_data(brw->gs.base.prog_data)->output_topology ==
_3DPRIM_LINESTRIP;
} else if (brw->tes.base.prog_data) {
/* BRW_NEW_TES_PROG_DATA */
return brw_tes_prog_data(brw->tes.base.prog_data)->output_topology ==
BRW_TESS_OUTPUT_TOPOLOGY_LINE;
} else {
/* BRW_NEW_PRIMITIVE */
switch (brw->primitive) {
case _3DPRIM_LINELIST:
case _3DPRIM_LINESTRIP:
case _3DPRIM_LINELOOP:
return true;
}
}
return false;
}
static void
upload_clip_state(struct brw_context *brw)
{
struct gl_context *ctx = &brw->ctx;
/* BRW_NEW_META_IN_PROGRESS */
uint32_t dw1 = brw->meta_in_progress ? 0 : GEN6_CLIP_STATISTICS_ENABLE;
uint32_t dw2 = 0;
/* _NEW_BUFFERS */
struct gl_framebuffer *fb = ctx->DrawBuffer;
/* BRW_NEW_FS_PROG_DATA */
if (brw_wm_prog_data(brw->wm.base.prog_data)->barycentric_interp_modes &
BRW_BARYCENTRIC_NONPERSPECTIVE_BITS) {
dw2 |= GEN6_CLIP_NON_PERSPECTIVE_BARYCENTRIC_ENABLE;
}
/* BRW_NEW_VS_PROG_DATA */
dw1 |= brw_vue_prog_data(brw->vs.base.prog_data)->cull_distance_mask;
if (brw->gen >= 7)
dw1 |= GEN7_CLIP_EARLY_CULL;
if (brw->gen == 7) {
/* _NEW_POLYGON */
if (ctx->Polygon._FrontBit == _mesa_is_user_fbo(fb))
dw1 |= GEN7_CLIP_WINDING_CCW;
if (ctx->Polygon.CullFlag) {
switch (ctx->Polygon.CullFaceMode) {
case GL_FRONT:
dw1 |= GEN7_CLIP_CULLMODE_FRONT;
break;
case GL_BACK:
dw1 |= GEN7_CLIP_CULLMODE_BACK;
break;
case GL_FRONT_AND_BACK:
dw1 |= GEN7_CLIP_CULLMODE_BOTH;
break;
default:
unreachable("Should not get here: invalid CullFlag");
}
} else {
dw1 |= GEN7_CLIP_CULLMODE_NONE;
}
}
if (brw->gen < 8 && !ctx->Transform.DepthClamp)
dw2 |= GEN6_CLIP_Z_TEST;
/* _NEW_LIGHT */
if (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION) {
dw2 |=
(0 << GEN6_CLIP_TRI_PROVOKE_SHIFT) |
(1 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) |
(0 << GEN6_CLIP_LINE_PROVOKE_SHIFT);
} else {
dw2 |=
(2 << GEN6_CLIP_TRI_PROVOKE_SHIFT) |
(2 << GEN6_CLIP_TRIFAN_PROVOKE_SHIFT) |
(1 << GEN6_CLIP_LINE_PROVOKE_SHIFT);
}
/* _NEW_TRANSFORM */
dw2 |= (ctx->Transform.ClipPlanesEnabled <<
GEN6_USER_CLIP_CLIP_DISTANCES_SHIFT);
/* Have the hardware use the user clip distance clip test enable bitmask
* specified here in 3DSTATE_CLIP rather than the one in 3DSTATE_VS/DS/GS.
* We already listen to _NEW_TRANSFORM here, but the other atoms don't
* need to other than this.
*/
if (brw->gen >= 8)
dw1 |= GEN8_CLIP_FORCE_USER_CLIP_DISTANCE_BITMASK;
if (ctx->Transform.ClipDepthMode == GL_ZERO_TO_ONE)
dw2 |= GEN6_CLIP_API_D3D;
else
dw2 |= GEN6_CLIP_API_OGL;
dw2 |= GEN6_CLIP_GB_TEST;
/* BRW_NEW_VIEWPORT_COUNT */
const unsigned viewport_count = brw->clip.viewport_count;
/* BRW_NEW_RASTERIZER_DISCARD */
if (ctx->RasterDiscard) {
dw2 |= GEN6_CLIP_MODE_REJECT_ALL;
if (brw->gen == 6) {
perf_debug("Rasterizer discard is currently implemented via the "
"clipper; having the GS not write primitives would "
"likely be faster.\n");
}
}
uint32_t enable;
if (brw->primitive == _3DPRIM_RECTLIST)
enable = 0;
else
enable = GEN6_CLIP_ENABLE;
/* _NEW_POLYGON,
* BRW_NEW_GEOMETRY_PROGRAM | BRW_NEW_TES_PROG_DATA | BRW_NEW_PRIMITIVE
*/
if (!brw_is_drawing_points(brw) && !brw_is_drawing_lines(brw))
dw2 |= GEN6_CLIP_XY_TEST;
BEGIN_BATCH(4);
OUT_BATCH(_3DSTATE_CLIP << 16 | (4 - 2));
OUT_BATCH(dw1);
OUT_BATCH(enable |
GEN6_CLIP_MODE_NORMAL |
dw2);
OUT_BATCH(U_FIXED(0.125, 3) << GEN6_CLIP_MIN_POINT_WIDTH_SHIFT |
U_FIXED(255.875, 3) << GEN6_CLIP_MAX_POINT_WIDTH_SHIFT |
(_mesa_geometric_layers(fb) > 0 ? 0 : GEN6_CLIP_FORCE_ZERO_RTAINDEX) |
((viewport_count - 1) & GEN6_CLIP_MAX_VP_INDEX_MASK));
ADVANCE_BATCH();
}
const struct brw_tracked_state gen6_clip_state = {
.dirty = {
.mesa = _NEW_BUFFERS |
_NEW_LIGHT |
_NEW_POLYGON |
_NEW_TRANSFORM,
.brw = BRW_NEW_BLORP |
BRW_NEW_CONTEXT |
BRW_NEW_FS_PROG_DATA |
BRW_NEW_GS_PROG_DATA |
BRW_NEW_VS_PROG_DATA |
BRW_NEW_META_IN_PROGRESS |
BRW_NEW_PRIMITIVE |
BRW_NEW_RASTERIZER_DISCARD |
BRW_NEW_TES_PROG_DATA |
BRW_NEW_VIEWPORT_COUNT,
},
.emit = upload_clip_state,
};
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