#include "brw_defines.h"
#include "brw_util.h"
#include "main/macros.h"
+#include "main/fbobject.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.
+ */
static uint32_t
-get_attr_override(struct brw_context *brw, int fs_attr)
+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_index = 0, i, vs_attr;
-
- if (fs_attr <= FRAG_ATTRIB_TEX7)
- vs_attr = fs_attr;
- else if (fs_attr == FRAG_ATTRIB_FACE)
- vs_attr = 0; /* XXX */
- else if (fs_attr == FRAG_ATTRIB_PNTC)
- vs_attr = 0; /* XXX */
- else {
- assert(fs_attr >= FRAG_ATTRIB_VAR0);
- vs_attr = fs_attr - FRAG_ATTRIB_VAR0 + VERT_RESULT_VAR0;
+ /* Find the VUE slot for this attribute. */
+ int slot = vue_map->varying_to_slot[fs_attr];
+
+ /* If there was only a back color written but not front, use back
+ * as the color instead of undefined
+ */
+ 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. 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 (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));
}
- /* Find the source index (0 = first attribute after the 4D position)
- * for this output attribute. attr is currently a VERT_RESULT_* but should
- * be FRAG_ATTRIB_*.
+ /* 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.
+ */
+ 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.
*/
- for (i = 1; i < vs_attr; i++) {
- if (brw->vs.prog_data->outputs_written & BITFIELD64_BIT(i))
- attr_index++;
+ 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 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)
+{
+ const int urb_entry_read_offset = BRW_SF_URB_ENTRY_READ_OFFSET;
+ uint32_t max_source_attr = 0;
+
+ *point_sprite_enables = 0;
+ *flat_enables = 0;
+
+ /* _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);
}
- return attr_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;
- /* CACHE_NEW_VS_PROG */
- uint32_t num_inputs = brw_count_bits(brw->vs.prog_data->outputs_written);
- uint32_t num_outputs = brw_count_bits(brw->fragment_program->Base.InputsRead);
- uint32_t dw1, dw2, dw3, dw4, dw16;
+ 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;
-
- dw1 =
- GEN6_SF_SWIZZLE_ENABLE |
- num_outputs << GEN6_SF_NUM_OUTPUTS_SHIFT |
- (num_inputs + 1) / 2 << GEN6_SF_URB_ENTRY_READ_LENGTH_SHIFT |
- 1 << GEN6_SF_URB_ENTRY_READ_OFFSET_SHIFT;
- dw2 = GEN6_SF_VIEWPORT_TRANSFORM_ENABLE |
- GEN6_SF_STATISTICS_ENABLE;
+ bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer);
+ bool multisampled_fbo = ctx->DrawBuffer->Visual.samples > 1;
+
+ const int urb_entry_read_offset = BRW_SF_URB_ENTRY_READ_OFFSET;
+ float point_size;
+ uint16_t attr_overrides[16];
+ uint32_t point_sprite_origin;
+
+ dw1 = GEN6_SF_SWIZZLE_ENABLE | num_outputs << GEN6_SF_NUM_OUTPUTS_SHIFT;
+ dw2 = GEN6_SF_STATISTICS_ENABLE;
+
+ if (brw->sf.viewport_transform_enable)
+ dw2 |= GEN6_SF_VIEWPORT_TRANSFORM_ENABLE;
+
dw3 = 0;
dw4 = 0;
- dw16 = 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)
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:
+ unreachable("not reached");
+ }
+
+ 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:
+ 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;
+ {
+ /* OpenGL dictates that line width should be rounded to the nearest
+ * integer
+ */
+ float line_width =
+ roundf(CLAMP(ctx->Line.Width, 0.0, ctx->Const.MaxLineWidth));
+ uint32_t line_width_u3_7 = U_FIXED(line_width, 7);
+
+ /* Line width of 0 is not allowed when MSAA enabled */
+ if (ctx->Multisample._Enabled) {
+ if (line_width_u3_7 == 0)
+ line_width_u3_7 = 1;
+ } else if (ctx->Line.SmoothFlag && ctx->Line.Width < 1.5) {
+ /* For 1 pixel line thickness or less, the general
+ * anti-aliasing algorithm gives up, and a garbage line is
+ * generated. Setting a Line Width of 0.0 specifies the
+ * rasterization of the "thinnest" (one-pixel-wide),
+ * non-antialiased lines.
+ *
+ * Lines rendered with zero Line Width are rasterized using
+ * Grid Intersection Quantization rules as specified by
+ * bspec section 6.3.12.1 Zero-Width (Cosmetic) Line
+ * Rasterization.
+ */
+ line_width_u3_7 = 0;
+ }
+ 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;
- dw4 |= U_FIXED(CLAMP(ctx->Point.Size, 0.125, 225.875), 3) <<
- GEN6_SF_POINT_WIDTH_SHIFT;
- if (ctx->Point.SpriteOrigin == GL_LOWER_LEFT)
- dw1 |= GEN6_SF_POINT_SPRITE_LOWERLEFT;
+ /* 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);
+
+ /*
+ * 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);
}
- if (ctx->Point.PointSprite) {
- for (i = 0; i < 8; i++) {
- if (ctx->Point.CoordReplace[i])
- dw16 |= (1 << i);
- }
- }
+ /* BRW_NEW_VUE_MAP_GEOM_OUT | BRW_NEW_FRAGMENT_PROGRAM |
+ * _NEW_POINT | _NEW_LIGHT | _NEW_PROGRAM | BRW_NEW_FS_PROG_DATA
+ */
+ uint32_t urb_entry_read_length;
+ calculate_attr_overrides(brw, attr_overrides, &point_sprite_enables,
+ &flat_enables, &urb_entry_read_length);
+ 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(CMD_3D_SF_STATE << 16 | (20 - 2));
+ 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 */
+ OUT_BATCH_F(ctx->Polygon.OffsetClamp); /* global depth offset clamp */
for (i = 0; i < 8; i++) {
- uint32_t attr_overrides = 0;
-
- for (; attr < 64; attr++) {
- if (brw->fragment_program->Base.InputsRead & BITFIELD64_BIT(attr)) {
- attr_overrides |= get_attr_override(brw, attr);
- attr++;
- break;
- }
- }
-
- for (; attr < 64; attr++) {
- if (brw->fragment_program->Base.InputsRead & BITFIELD64_BIT(attr)) {
- attr_overrides |= get_attr_override(brw, attr) << 16;
- attr++;
- break;
- }
- }
- OUT_BATCH(attr_overrides);
+ OUT_BATCH(attr_overrides[i * 2] | attr_overrides[i * 2 + 1] << 16);
}
- OUT_BATCH(dw16); /* point sprite texcoord bitmask */
- OUT_BATCH(0); /* 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_POLYGON |
- _NEW_LINE |
- _NEW_SCISSOR |
- _NEW_BUFFERS),
- .brw = BRW_NEW_CONTEXT,
- .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