#include "brw_defines.h"
#include "brw_util.h"
#include "main/macros.h"
+#include "main/fbobject.h"
+#include "main/framebuffer.h"
#include "intel_batchbuffer.h"
/**
* 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)
+static uint32_t
+get_attr_override(const struct brw_vue_map *vue_map, int urb_entry_read_offset,
+ int fs_attr, bool two_side_color, uint32_t *max_source_attr)
{
- 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];
+ int slot = vue_map->varying_to_slot[fs_attr];
+
+ /* Viewport and Layer are stored in the VUE header. We need to override
+ * them to zero if earlier stages didn't write them, as GL requires that
+ * they read back as zero when not explicitly set.
+ */
+ if (fs_attr == VARYING_SLOT_VIEWPORT || fs_attr == VARYING_SLOT_LAYER) {
+ unsigned override =
+ ATTRIBUTE_0_OVERRIDE_X | ATTRIBUTE_0_OVERRIDE_W |
+ ATTRIBUTE_CONST_0000 << ATTRIBUTE_0_CONST_SOURCE_SHIFT;
+
+ if (!(vue_map->slots_valid & VARYING_BIT_LAYER))
+ override |= ATTRIBUTE_0_OVERRIDE_Y;
+ if (!(vue_map->slots_valid & VARYING_BIT_VIEWPORT))
+ override |= ATTRIBUTE_0_OVERRIDE_Z;
+
+ return override;
+ }
/* 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 && fs_attr == VARYING_SLOT_COL0)
+ slot = vue_map->varying_to_slot[VARYING_SLOT_BFC0];
+ if (slot == -1 && fs_attr == VARYING_SLOT_COL1)
+ slot = vue_map->varying_to_slot[VARYING_SLOT_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.
+ * shader did not write to it. This means that either:
+ *
+ * (a) This attribute is a texture coordinate, and it is going to be
+ * replaced with point coordinates (as a consequence of a call to
+ * glTexEnvi(GL_POINT_SPRITE, GL_COORD_REPLACE, GL_TRUE)), so the
+ * hardware will ignore whatever attribute override we supply.
+ *
+ * (b) This attribute is read by the fragment shader but not written by
+ * the vertex shader, so its value is undefined. Therefore the
+ * attribute override we supply doesn't matter.
+ *
+ * (c) This attribute is gl_PrimitiveID, and it wasn't written by the
+ * previous shader stage.
+ *
+ * Note that we don't have to worry about the cases where the attribute
+ * is gl_PointCoord or is undergoing point sprite coordinate
+ * replacement, because in those cases, this function isn't called.
+ *
+ * In case (c), we need to program the attribute overrides so that the
+ * primitive ID will be stored in this slot. In every other case, the
+ * attribute override we supply doesn't matter. So just go ahead and
+ * program primitive ID in every case.
*/
- return 0;
+ return (ATTRIBUTE_0_OVERRIDE_W |
+ ATTRIBUTE_0_OVERRIDE_Z |
+ ATTRIBUTE_0_OVERRIDE_Y |
+ ATTRIBUTE_0_OVERRIDE_X |
+ (ATTRIBUTE_CONST_PRIM_ID << ATTRIBUTE_0_CONST_SOURCE_SHIFT));
}
/* 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);
+ int source_attr = slot - 2 * urb_entry_read_offset;
+ assert(source_attr >= 0 && source_attr < 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);
+ bool swizzling = two_side_color &&
+ ((vue_map->slot_to_varying[slot] == VARYING_SLOT_COL0 &&
+ vue_map->slot_to_varying[slot+1] == VARYING_SLOT_BFC0) ||
+ (vue_map->slot_to_varying[slot] == VARYING_SLOT_COL1 &&
+ vue_map->slot_to_varying[slot+1] == VARYING_SLOT_BFC1));
+
+ /* Update max_source_attr. If swizzling, the SF will read this slot + 1. */
+ if (*max_source_attr < source_attr + swizzling)
+ *max_source_attr = source_attr + swizzling;
+
+ if (swizzling) {
+ return source_attr |
+ (ATTRIBUTE_SWIZZLE_INPUTATTR_FACING << ATTRIBUTE_SWIZZLE_SHIFT);
}
- return attr_override;
+ return source_attr;
}
+
+static bool
+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->geometry_program) {
+ /* BRW_NEW_GEOMETRY_PROGRAM */
+ return brw->geometry_program->OutputType == GL_POINTS;
+ } else {
+ /* BRW_NEW_PRIMITIVE */
+ return brw->primitive == _3DPRIM_POINTLIST;
+ }
+}
+
+
+/**
+ * Create the mapping from the FS inputs we produce to the previous pipeline
+ * stage (GS or VS) outputs they source from.
+ */
+void
+calculate_attr_overrides(const struct brw_context *brw,
+ uint16_t *attr_overrides,
+ uint32_t *point_sprite_enables,
+ uint32_t *flat_enables,
+ uint32_t *urb_entry_read_length,
+ uint32_t *urb_entry_read_offset)
+{
+ uint32_t max_source_attr = 0;
+
+ *point_sprite_enables = 0;
+ *flat_enables = 0;
+
+ *urb_entry_read_offset = BRW_SF_URB_ENTRY_READ_OFFSET;
+
+ /* BRW_NEW_FRAGMENT_PROGRAM
+ *
+ * If the fragment shader reads VARYING_SLOT_LAYER, then we need to pass in
+ * the full vertex header. Otherwise, we can program the SF to start
+ * reading at an offset of 1 (2 varying slots) to skip unnecessary data:
+ * - VARYING_SLOT_PSIZ and BRW_VARYING_SLOT_NDC on gen4-5
+ * - VARYING_SLOT_{PSIZ,LAYER} and VARYING_SLOT_POS on gen6+
+ */
+
+ bool fs_needs_vue_header = brw->fragment_program->Base.InputsRead &
+ (VARYING_BIT_LAYER | VARYING_BIT_VIEWPORT);
+
+ *urb_entry_read_offset = fs_needs_vue_header ? 0 : 1;
+
+ /* _NEW_LIGHT */
+ bool shade_model_flat = brw->ctx.Light.ShadeModel == GL_FLAT;
+
+ /* From the Ivybridge PRM, Vol 2 Part 1, 3DSTATE_SBE,
+ * description of dw10 Point Sprite Texture Coordinate Enable:
+ *
+ * "This field must be programmed to zero when non-point primitives
+ * are rendered."
+ *
+ * The SandyBridge PRM doesn't explicitly say that point sprite enables
+ * must be programmed to zero when rendering non-point primitives, but
+ * the IvyBridge PRM does, and if we don't, we get garbage.
+ *
+ * This is not required on Haswell, as the hardware ignores this state
+ * when drawing non-points -- although we do still need to be careful to
+ * correctly set the attr overrides.
+ */
+ /* BRW_NEW_PRIMITIVE | BRW_NEW_GEOMETRY_PROGRAM */
+ bool drawing_points = is_drawing_points(brw);
+
+ /* Initialize all the attr_overrides to 0. In the loop below we'll modify
+ * just the ones that correspond to inputs used by the fs.
+ */
+ memset(attr_overrides, 0, 16*sizeof(*attr_overrides));
+
+ for (int attr = 0; attr < VARYING_SLOT_MAX; attr++) {
+ /* BRW_NEW_FRAGMENT_PROGRAM */
+ enum glsl_interp_qualifier interp_qualifier =
+ brw->fragment_program->InterpQualifier[attr];
+ bool is_gl_Color = attr == VARYING_SLOT_COL0 || attr == VARYING_SLOT_COL1;
+ /* BRW_NEW_FS_PROG_DATA */
+ int input_index = brw->wm.prog_data->urb_setup[attr];
+
+ if (input_index < 0)
+ continue;
+
+ /* _NEW_POINT */
+ bool point_sprite = false;
+ if (drawing_points) {
+ if (brw->ctx.Point.PointSprite &&
+ (attr >= VARYING_SLOT_TEX0 && attr <= VARYING_SLOT_TEX7) &&
+ brw->ctx.Point.CoordReplace[attr - VARYING_SLOT_TEX0]) {
+ point_sprite = true;
+ }
+
+ if (attr == VARYING_SLOT_PNTC)
+ point_sprite = true;
+
+ if (point_sprite)
+ *point_sprite_enables |= (1 << input_index);
+ }
+
+ /* flat shading */
+ if (interp_qualifier == INTERP_QUALIFIER_FLAT ||
+ (shade_model_flat && is_gl_Color &&
+ interp_qualifier == INTERP_QUALIFIER_NONE))
+ *flat_enables |= (1 << input_index);
+
+ /* BRW_NEW_VUE_MAP_GEOM_OUT | _NEW_LIGHT | _NEW_PROGRAM */
+ uint16_t attr_override = point_sprite ? 0 :
+ get_attr_override(&brw->vue_map_geom_out,
+ *urb_entry_read_offset, attr,
+ brw->ctx.VertexProgram._TwoSideEnabled,
+ &max_source_attr);
+
+ /* 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.
+ */
+ if (input_index < 16)
+ attr_overrides[input_index] = attr_override;
+ else
+ assert(attr_override == input_index);
+ }
+
+ /* From the Sandy Bridge PRM, Volume 2, Part 1, documentation for
+ * 3DSTATE_SF DWord 1 bits 15:11, "Vertex URB Entry Read Length":
+ *
+ * "This field should be set to the minimum length required to read the
+ * maximum source attribute. The maximum source attribute is indicated
+ * by the maximum value of the enabled Attribute # Source Attribute if
+ * Attribute Swizzle Enable is set, Number of Output Attributes-1 if
+ * enable is not set.
+ * read_length = ceiling((max_source_attr + 1) / 2)
+ *
+ * [errata] Corruption/Hang possible if length programmed larger than
+ * recommended"
+ *
+ * Similar text exists for Ivy Bridge.
+ */
+ *urb_entry_read_length = ALIGN(max_source_attr + 1, 2) / 2;
+}
+
+
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);
- uint32_t dw1, dw2, dw3, dw4, dw16, dw17;
+ struct gl_context *ctx = &brw->ctx;
+ /* BRW_NEW_FS_PROG_DATA */
+ uint32_t num_outputs = brw->wm.prog_data->num_varying_inputs;
+ uint32_t dw1, dw2, dw3, dw4;
+ uint32_t point_sprite_enables;
+ uint32_t flat_enables;
int i;
/* _NEW_BUFFER */
- GLboolean render_to_fbo = brw->intel.ctx.DrawBuffer->Name != 0;
- int attr = 0, input_index = 0;
- int urb_entry_read_offset = 1;
+ bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
+ const bool multisampled_fbo = _mesa_geometric_samples(ctx->DrawBuffer) > 1;
+
float point_size;
- uint16_t attr_overrides[FRAG_ATTRIB_MAX];
- int nr_userclip;
+ uint16_t attr_overrides[16];
+ uint32_t point_sprite_origin;
- /* _NEW_TRANSFORM */
- nr_userclip = _mesa_bitcount_64(ctx->Transform.ClipPlanesEnabled);
+ dw1 = GEN6_SF_SWIZZLE_ENABLE | num_outputs << GEN6_SF_NUM_OUTPUTS_SHIFT;
+ dw2 = GEN6_SF_STATISTICS_ENABLE;
- brw_compute_vue_map(&vue_map, intel, nr_userclip, 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;
- }
+ if (brw->sf.viewport_transform_enable)
+ dw2 |= GEN6_SF_VIEWPORT_TRANSFORM_ENABLE;
- 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_VIEWPORT_TRANSFORM_ENABLE |
- GEN6_SF_STATISTICS_ENABLE;
dw3 = 0;
dw4 = 0;
- dw16 = 0;
- dw17 = 0;
/* _NEW_POLYGON */
- if ((ctx->Polygon.FrontFace == GL_CCW) ^ render_to_fbo)
+ if (ctx->Polygon._FrontBit == render_to_fbo)
dw2 |= GEN6_SF_WINDING_CCW;
if (ctx->Polygon.OffsetFill)
break;
default:
- assert(0);
- break;
+ unreachable("not reached");
}
switch (ctx->Polygon.BackMode) {
break;
default:
- assert(0);
- break;
+ unreachable("not reached");
}
/* _NEW_SCISSOR */
- if (ctx->Scissor.Enabled)
+ if (ctx->Scissor.EnableFlags)
dw3 |= GEN6_SF_SCISSOR_ENABLE;
/* _NEW_POLYGON */
dw3 |= GEN6_SF_CULL_BOTH;
break;
default:
- assert(0);
- break;
+ unreachable("not reached");
}
} 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;
+ {
+ uint32_t line_width_u3_7 = brw_get_line_width(brw);
+ dw3 |= line_width_u3_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_MULTISAMPLE */
+ if (multisampled_fbo && ctx->Multisample.Enabled)
+ dw3 |= GEN6_SF_MSRAST_ON_PATTERN;
- /* _NEW_POINT */
+ /* _NEW_PROGRAM | _NEW_POINT */
if (!(ctx->VertexProgram.PointSizeEnabled ||
ctx->Point._Attenuated))
dw4 |= GEN6_SF_USE_STATE_POINT_WIDTH;
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);
+ dw4 |= U_FIXED(CLAMP(point_size, 0.125f, 255.875f), 3);
- if (ctx->Point.SpriteOrigin == GL_LOWER_LEFT)
- dw1 |= GEN6_SF_POINT_SPRITE_LOWERLEFT;
+ /*
+ * Window coordinates in an FBO are inverted, which means point
+ * sprite origin must be inverted, too.
+ */
+ if ((ctx->Point.SpriteOrigin == GL_LOWER_LEFT) != render_to_fbo) {
+ point_sprite_origin = GEN6_SF_POINT_SPRITE_LOWERLEFT;
+ } else {
+ point_sprite_origin = GEN6_SF_POINT_SPRITE_UPPERLEFT;
+ }
+ dw1 |= point_sprite_origin;
/* _NEW_LIGHT */
if (ctx->Light.ProvokingVertex != GL_FIRST_VERTEX_CONVENTION) {
(1 << GEN6_SF_TRIFAN_PROVOKE_SHIFT);
}
- /* Create the mapping from the FS inputs we produce to the VS outputs
- * they source from.
+ /* BRW_NEW_VUE_MAP_GEOM_OUT | BRW_NEW_FRAGMENT_PROGRAM |
+ * _NEW_POINT | _NEW_LIGHT | _NEW_PROGRAM | BRW_NEW_FS_PROG_DATA
*/
- for (; attr < FRAG_ATTRIB_MAX; attr++) {
- 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 (ctx->Light.ShadeModel == GL_FLAT) {
- /*
- * Setup the Constant Interpolation Enable bit mask for each
- * corresponding attribute(currently, we only care two attrs:
- * FRAG_BIT_COL0 and FRAG_BIT_COL1).
- *
- * FIXME: should we care other attributes?
- */
- if (attr == FRAG_ATTRIB_COL0 || attr == FRAG_ATTRIB_COL1)
- 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;
+ uint32_t urb_entry_read_length;
+ uint32_t urb_entry_read_offset;
+ calculate_attr_overrides(brw, attr_overrides, &point_sprite_enables,
+ &flat_enables, &urb_entry_read_length,
+ &urb_entry_read_offset);
+ dw1 |= (urb_entry_read_length << GEN6_SF_URB_ENTRY_READ_LENGTH_SHIFT |
+ urb_entry_read_offset << GEN6_SF_URB_ENTRY_READ_OFFSET_SHIFT);
BEGIN_BATCH(20);
OUT_BATCH(_3DSTATE_SF << 16 | (20 - 2));
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 */
+ OUT_BATCH_F(ctx->Polygon.OffsetClamp); /* 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(point_sprite_enables); /* dw16 */
+ OUT_BATCH(flat_enables);
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),
- .cache = CACHE_NEW_VS_PROG
+ .mesa = _NEW_BUFFERS |
+ _NEW_LIGHT |
+ _NEW_LINE |
+ _NEW_MULTISAMPLE |
+ _NEW_POINT |
+ _NEW_POLYGON |
+ _NEW_PROGRAM |
+ _NEW_SCISSOR,
+ .brw = BRW_NEW_CONTEXT |
+ BRW_NEW_FRAGMENT_PROGRAM |
+ BRW_NEW_FS_PROG_DATA |
+ BRW_NEW_GEOMETRY_PROGRAM |
+ BRW_NEW_PRIMITIVE |
+ BRW_NEW_VUE_MAP_GEOM_OUT,
},
.emit = upload_sf_state,
};
projects / mesa.git / blobdiff