| /* |
| * 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 "compiler/nir/nir.h" |
| #include "main/macros.h" |
| #include "main/fbobject.h" |
| #include "main/framebuffer.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(const struct brw_vue_map *vue_map, int urb_entry_read_offset, |
| int fs_attr, bool two_side_color, uint32_t *max_source_attr) |
| { |
| /* Find the VUE slot for this attribute. */ |
| 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 && 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)); |
| } |
| |
| /* 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. |
| */ |
| 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; |
| } |
| |
| |
| /** |
| * 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 *urb_entry_read_length, |
| uint32_t *urb_entry_read_offset) |
| { |
| /* BRW_NEW_FS_PROG_DATA */ |
| const struct brw_wm_prog_data *wm_prog_data = |
| brw_wm_prog_data(brw->wm.base.prog_data); |
| uint32_t max_source_attr = 0; |
| |
| *point_sprite_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->info.inputs_read & |
| (VARYING_BIT_LAYER | VARYING_BIT_VIEWPORT); |
| |
| *urb_entry_read_offset = fs_needs_vue_header ? 0 : 1; |
| |
| /* 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. |
| * |
| * _NEW_POLYGON |
| * BRW_NEW_PRIMITIVE | BRW_NEW_GS_PROG_DATA | BRW_NEW_TES_PROG_DATA |
| */ |
| bool drawing_points = brw_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++) { |
| int input_index = 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 & (1u << (attr - VARYING_SLOT_TEX0)))) { |
| point_sprite = true; |
| } |
| |
| if (attr == VARYING_SLOT_PNTC) |
| point_sprite = true; |
| |
| if (point_sprite) |
| *point_sprite_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 gl_context *ctx = &brw->ctx; |
| /* BRW_NEW_FS_PROG_DATA */ |
| const struct brw_wm_prog_data *wm_prog_data = |
| brw_wm_prog_data(brw->wm.base.prog_data); |
| uint32_t num_outputs = wm_prog_data->num_varying_inputs; |
| uint32_t dw1, dw2, dw3, dw4; |
| uint32_t point_sprite_enables; |
| int i; |
| /* _NEW_BUFFER */ |
| 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[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; |
| |
| /* _NEW_POLYGON */ |
| 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 | _NEW_POLYGON, |
| * BRW_NEW_GS_PROG_DATA | BRW_NEW_TES_PROG_DATA | BRW_NEW_PRIMITIVE |
| */ |
| if (ctx->Scissor.EnableFlags || |
| brw_is_drawing_points(brw) || brw_is_drawing_lines(brw)) |
| 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: |
| unreachable("not reached"); |
| } |
| } else { |
| dw3 |= GEN6_SF_CULL_NONE; |
| } |
| |
| /* _NEW_LINE */ |
| { |
| 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_PROGRAM | _NEW_POINT, BRW_NEW_VUE_MAP_GEOM_OUT */ |
| if (use_state_point_size(brw)) |
| dw4 |= GEN6_SF_USE_STATE_POINT_WIDTH; |
| |
| /* _NEW_POINT - 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, 0.125f, 255.875f), 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) { |
| 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); |
| } |
| |
| /* 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; |
| uint32_t urb_entry_read_offset; |
| calculate_attr_overrides(brw, attr_overrides, &point_sprite_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(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(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(point_sprite_enables); /* dw16 */ |
| OUT_BATCH(wm_prog_data->flat_inputs); |
| 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_BUFFERS | |
| _NEW_LIGHT | |
| _NEW_LINE | |
| _NEW_MULTISAMPLE | |
| _NEW_POINT | |
| _NEW_POLYGON | |
| _NEW_PROGRAM | |
| _NEW_SCISSOR, |
| .brw = BRW_NEW_BLORP | |
| BRW_NEW_CONTEXT | |
| BRW_NEW_FRAGMENT_PROGRAM | |
| BRW_NEW_FS_PROG_DATA | |
| BRW_NEW_GS_PROG_DATA | |
| BRW_NEW_PRIMITIVE | |
| BRW_NEW_TES_PROG_DATA | |
| BRW_NEW_VUE_MAP_GEOM_OUT, |
| }, |
| .emit = upload_sf_state, |
| }; |
