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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 "main/macros.h"
#include "intel_batchbuffer.h"
/**
* Determine the appropriate attribute override value to store into the
* 3DSTATE_SF structure for a given fragment shader attribute. The attribute
* override value contains two pieces of information: the location of the
* attribute in the VUE (relative to urb_entry_read_offset, see below), and a
* flag indicating whether to "swizzle" the attribute based on the direction
* the triangle is facing.
*
* If an attribute is "swizzled", then the given VUE location is used for
* front-facing triangles, and the VUE location that immediately follows is
* used for back-facing triangles. We use this to implement the mapping from
* gl_FrontColor/gl_BackColor to gl_Color.
*
* urb_entry_read_offset is the offset into the VUE at which the SF unit is
* being instructed to begin reading attribute data. It can be set to a
* nonzero value to prevent the SF unit from wasting time reading elements of
* the VUE that are not needed by the fragment shader. It is measured in
* 256-bit increments.
*/
uint32_t
get_attr_override(struct brw_vue_map *vue_map, int urb_entry_read_offset,
int fs_attr, bool two_side_color)
{
int attr_override, slot;
int vs_attr = _mesa_frag_attrib_to_vert_result(fs_attr);
if (vs_attr < 0 || vs_attr == VERT_RESULT_HPOS) {
/* These attributes will be overwritten by the fragment shader's
* interpolation code (see emit_interp() in brw_wm_fp.c), so just let
* them reference the first available attribute.
*/
return 0;
}
/* Find the VUE slot for this attribute. */
slot = vue_map->vert_result_to_slot[vs_attr];
/* If there was only a back color written but not front, use back
* as the color instead of undefined
*/
if (slot == -1 && vs_attr == VERT_RESULT_COL0)
slot = vue_map->vert_result_to_slot[VERT_RESULT_BFC0];
if (slot == -1 && vs_attr == VERT_RESULT_COL1)
slot = vue_map->vert_result_to_slot[VERT_RESULT_BFC1];
if (slot == -1) {
/* This attribute does not exist in the VUE--that means that the vertex
* shader did not write to it. Behavior is undefined in this case, so
* just reference the first available attribute.
*/
return 0;
}
/* Compute the location of the attribute relative to urb_entry_read_offset.
* Each increment of urb_entry_read_offset represents a 256-bit value, so
* it counts for two 128-bit VUE slots.
*/
attr_override = slot - 2 * urb_entry_read_offset;
assert (attr_override >= 0 && attr_override < 32);
/* If we are doing two-sided color, and the VUE slot following this one
* represents a back-facing color, then we need to instruct the SF unit to
* do back-facing swizzling.
*/
if (two_side_color) {
if (vue_map->slot_to_vert_result[slot] == VERT_RESULT_COL0 &&
vue_map->slot_to_vert_result[slot+1] == VERT_RESULT_BFC0)
attr_override |= (ATTRIBUTE_SWIZZLE_INPUTATTR_FACING << ATTRIBUTE_SWIZZLE_SHIFT);
else if (vue_map->slot_to_vert_result[slot] == VERT_RESULT_COL1 &&
vue_map->slot_to_vert_result[slot+1] == VERT_RESULT_BFC1)
attr_override |= (ATTRIBUTE_SWIZZLE_INPUTATTR_FACING << ATTRIBUTE_SWIZZLE_SHIFT);
}
return attr_override;
}
static void
upload_sf_state(struct brw_context *brw)
{
struct intel_context *intel = &brw->intel;
struct gl_context *ctx = &intel->ctx;
struct brw_vue_map vue_map;
uint32_t urb_entry_read_length;
/* CACHE_NEW_VS_PROG */
GLbitfield64 vs_outputs_written = brw->vs.prog_data->outputs_written;
/* BRW_NEW_FRAGMENT_PROGRAM */
uint32_t num_outputs = _mesa_bitcount_64(brw->fragment_program->Base.InputsRead);
/* _NEW_LIGHT */
bool shade_model_flat = ctx->Light.ShadeModel == GL_FLAT;
uint32_t dw1, dw2, dw3, dw4, dw16, dw17;
int i;
/* _NEW_BUFFER */
bool render_to_fbo = brw->intel.ctx.DrawBuffer->Name != 0;
int attr = 0, input_index = 0;
int urb_entry_read_offset = 1;
float point_size;
uint16_t attr_overrides[FRAG_ATTRIB_MAX];
bool userclip_active;
/* _NEW_TRANSFORM */
userclip_active = (ctx->Transform.ClipPlanesEnabled != 0);
brw_compute_vue_map(&vue_map, intel, userclip_active, vs_outputs_written);
urb_entry_read_length = (vue_map.num_slots + 1)/2 - urb_entry_read_offset;
if (urb_entry_read_length == 0) {
/* Setting the URB entry read length to 0 causes undefined behavior, so
* if we have no URB data to read, set it to 1.
*/
urb_entry_read_length = 1;
}
dw1 =
GEN6_SF_SWIZZLE_ENABLE |
num_outputs << GEN6_SF_NUM_OUTPUTS_SHIFT |
urb_entry_read_length << GEN6_SF_URB_ENTRY_READ_LENGTH_SHIFT |
urb_entry_read_offset << GEN6_SF_URB_ENTRY_READ_OFFSET_SHIFT;
dw2 = GEN6_SF_STATISTICS_ENABLE;
/* Enable viewport transform only if no HiZ operation is progress
*
* From page 11 of the SandyBridge PRM, Volume 2, Part 1, Section 1.3, "3D
* Primitives Overview":
* RECTLIST: Viewport Mapping must be DISABLED (as is typical with the
* use of screen- space coordinates).
*/
if (!brw->hiz.op)
dw2 |= GEN6_SF_VIEWPORT_TRANSFORM_ENABLE;
dw3 = 0;
dw4 = 0;
dw16 = 0;
dw17 = 0;
/* _NEW_POLYGON */
if ((ctx->Polygon.FrontFace == GL_CCW) ^ render_to_fbo)
dw2 |= GEN6_SF_WINDING_CCW;
if (ctx->Polygon.OffsetFill)
dw2 |= GEN6_SF_GLOBAL_DEPTH_OFFSET_SOLID;
if (ctx->Polygon.OffsetLine)
dw2 |= GEN6_SF_GLOBAL_DEPTH_OFFSET_WIREFRAME;
if (ctx->Polygon.OffsetPoint)
dw2 |= GEN6_SF_GLOBAL_DEPTH_OFFSET_POINT;
switch (ctx->Polygon.FrontMode) {
case GL_FILL:
dw2 |= GEN6_SF_FRONT_SOLID;
break;
case GL_LINE:
dw2 |= GEN6_SF_FRONT_WIREFRAME;
break;
case GL_POINT:
dw2 |= GEN6_SF_FRONT_POINT;
break;
default:
assert(0);
break;
}
switch (ctx->Polygon.BackMode) {
case GL_FILL:
dw2 |= GEN6_SF_BACK_SOLID;
break;
case GL_LINE:
dw2 |= GEN6_SF_BACK_WIREFRAME;
break;
case GL_POINT:
dw2 |= GEN6_SF_BACK_POINT;
break;
default:
assert(0);
break;
}
/* _NEW_SCISSOR */
if (ctx->Scissor.Enabled)
dw3 |= GEN6_SF_SCISSOR_ENABLE;
/* _NEW_POLYGON */
if (ctx->Polygon.CullFlag) {
switch (ctx->Polygon.CullFaceMode) {
case GL_FRONT:
dw3 |= GEN6_SF_CULL_FRONT;
break;
case GL_BACK:
dw3 |= GEN6_SF_CULL_BACK;
break;
case GL_FRONT_AND_BACK:
dw3 |= GEN6_SF_CULL_BOTH;
break;
default:
assert(0);
break;
}
} else {
dw3 |= GEN6_SF_CULL_NONE;
}
/* _NEW_LINE */
dw3 |= U_FIXED(CLAMP(ctx->Line.Width, 0.0, 7.99), 7) <<
GEN6_SF_LINE_WIDTH_SHIFT;
if (ctx->Line.SmoothFlag) {
dw3 |= GEN6_SF_LINE_AA_ENABLE;
dw3 |= GEN6_SF_LINE_AA_MODE_TRUE;
dw3 |= GEN6_SF_LINE_END_CAP_WIDTH_1_0;
}
/* _NEW_PROGRAM | _NEW_POINT */
if (!(ctx->VertexProgram.PointSizeEnabled ||
ctx->Point._Attenuated))
dw4 |= GEN6_SF_USE_STATE_POINT_WIDTH;
/* Clamp to ARB_point_parameters user limits */
point_size = CLAMP(ctx->Point.Size, ctx->Point.MinSize, ctx->Point.MaxSize);
/* Clamp to the hardware limits and convert to fixed point */
dw4 |= U_FIXED(CLAMP(point_size, 0.125, 255.875), 3);
if (ctx->Point.SpriteOrigin == GL_LOWER_LEFT)
dw1 |= GEN6_SF_POINT_SPRITE_LOWERLEFT;
/* _NEW_LIGHT */
if (ctx->Light.ProvokingVertex != GL_FIRST_VERTEX_CONVENTION) {
dw4 |=
(2 << GEN6_SF_TRI_PROVOKE_SHIFT) |
(2 << GEN6_SF_TRIFAN_PROVOKE_SHIFT) |
(1 << GEN6_SF_LINE_PROVOKE_SHIFT);
} else {
dw4 |=
(1 << GEN6_SF_TRIFAN_PROVOKE_SHIFT);
}
/* Create the mapping from the FS inputs we produce to the VS outputs
* they source from.
*/
for (; attr < FRAG_ATTRIB_MAX; attr++) {
enum glsl_interp_qualifier interp_qualifier =
brw->fragment_program->InterpQualifier[attr];
bool is_gl_Color = attr == FRAG_ATTRIB_COL0 || attr == FRAG_ATTRIB_COL1;
if (!(brw->fragment_program->Base.InputsRead & BITFIELD64_BIT(attr)))
continue;
/* _NEW_POINT */
if (ctx->Point.PointSprite &&
(attr >= FRAG_ATTRIB_TEX0 && attr <= FRAG_ATTRIB_TEX7) &&
ctx->Point.CoordReplace[attr - FRAG_ATTRIB_TEX0]) {
dw16 |= (1 << input_index);
}
if (attr == FRAG_ATTRIB_PNTC)
dw16 |= (1 << input_index);
/* flat shading */
if (interp_qualifier == INTERP_QUALIFIER_FLAT ||
(shade_model_flat && is_gl_Color &&
interp_qualifier == INTERP_QUALIFIER_NONE))
dw17 |= (1 << input_index);
/* The hardware can only do the overrides on 16 overrides at a
* time, and the other up to 16 have to be lined up so that the
* input index = the output index. We'll need to do some
* tweaking to make sure that's the case.
*/
assert(input_index < 16 || attr == input_index);
/* _NEW_LIGHT | _NEW_PROGRAM */
attr_overrides[input_index++] =
get_attr_override(&vue_map, urb_entry_read_offset, attr,
ctx->VertexProgram._TwoSideEnabled);
}
for (; input_index < FRAG_ATTRIB_MAX; input_index++)
attr_overrides[input_index] = 0;
BEGIN_BATCH(20);
OUT_BATCH(_3DSTATE_SF << 16 | (20 - 2));
OUT_BATCH(dw1);
OUT_BATCH(dw2);
OUT_BATCH(dw3);
OUT_BATCH(dw4);
OUT_BATCH_F(ctx->Polygon.OffsetUnits * 2); /* constant. copied from gen4 */
OUT_BATCH_F(ctx->Polygon.OffsetFactor); /* scale */
OUT_BATCH_F(0.0); /* XXX: global depth offset clamp */
for (i = 0; i < 8; i++) {
OUT_BATCH(attr_overrides[i * 2] | attr_overrides[i * 2 + 1] << 16);
}
OUT_BATCH(dw16); /* point sprite texcoord bitmask */
OUT_BATCH(dw17); /* constant interp bitmask */
OUT_BATCH(0); /* wrapshortest enables 0-7 */
OUT_BATCH(0); /* wrapshortest enables 8-15 */
ADVANCE_BATCH();
}
const struct brw_tracked_state gen6_sf_state = {
.dirty = {
.mesa = (_NEW_LIGHT |
_NEW_PROGRAM |
_NEW_POLYGON |
_NEW_LINE |
_NEW_SCISSOR |
_NEW_BUFFERS |
_NEW_POINT |
_NEW_TRANSFORM),
.brw = (BRW_NEW_CONTEXT |
BRW_NEW_FRAGMENT_PROGRAM |
BRW_NEW_HIZ),
.cache = CACHE_NEW_VS_PROG
},
.emit = upload_sf_state,
};
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