1 /*
2 * Copyright © 2011 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 */
23
24 /** \file gen6_sol.c
25 *
26 * Code to initialize the binding table entries used by transform feedback.
27 */
28
29 #include "main/macros.h"
30 #include "brw_context.h"
31 #include "intel_batchbuffer.h"
32 #include "brw_defines.h"
33 #include "brw_state.h"
34
35 static void
gen6_update_sol_surfaces(struct brw_context * brw)36 gen6_update_sol_surfaces(struct brw_context *brw)
37 {
38 struct gl_context *ctx = &brw->intel.ctx;
39 /* _NEW_TRANSFORM_FEEDBACK */
40 struct gl_transform_feedback_object *xfb_obj =
41 ctx->TransformFeedback.CurrentObject;
42 /* BRW_NEW_VERTEX_PROGRAM */
43 const struct gl_shader_program *shaderprog =
44 ctx->Shader.CurrentVertexProgram;
45 const struct gl_transform_feedback_info *linked_xfb_info =
46 &shaderprog->LinkedTransformFeedback;
47 int i;
48
49 for (i = 0; i < BRW_MAX_SOL_BINDINGS; ++i) {
50 const int surf_index = SURF_INDEX_SOL_BINDING(i);
51 if (xfb_obj->Active && !xfb_obj->Paused &&
52 i < linked_xfb_info->NumOutputs) {
53 unsigned buffer = linked_xfb_info->Outputs[i].OutputBuffer;
54 unsigned buffer_offset =
55 xfb_obj->Offset[buffer] / 4 +
56 linked_xfb_info->Outputs[i].DstOffset;
57 brw_update_sol_surface(
58 brw, xfb_obj->Buffers[buffer], &brw->gs.surf_offset[surf_index],
59 linked_xfb_info->Outputs[i].NumComponents,
60 linked_xfb_info->BufferStride[buffer], buffer_offset);
61 } else {
62 brw->gs.surf_offset[surf_index] = 0;
63 }
64 }
65
66 brw->state.dirty.brw |= BRW_NEW_SURFACES;
67 }
68
69 const struct brw_tracked_state gen6_sol_surface = {
70 .dirty = {
71 .mesa = _NEW_TRANSFORM_FEEDBACK,
72 .brw = (BRW_NEW_BATCH |
73 BRW_NEW_VERTEX_PROGRAM),
74 .cache = 0
75 },
76 .emit = gen6_update_sol_surfaces,
77 };
78
79 /**
80 * Constructs the binding table for the WM surface state, which maps unit
81 * numbers to surface state objects.
82 */
83 static void
brw_gs_upload_binding_table(struct brw_context * brw)84 brw_gs_upload_binding_table(struct brw_context *brw)
85 {
86 struct gl_context *ctx = &brw->intel.ctx;
87 /* BRW_NEW_VERTEX_PROGRAM */
88 const struct gl_shader_program *shaderprog =
89 ctx->Shader.CurrentVertexProgram;
90 bool has_surfaces = false;
91 uint32_t *bind;
92
93 if (shaderprog) {
94 const struct gl_transform_feedback_info *linked_xfb_info =
95 &shaderprog->LinkedTransformFeedback;
96 /* Currently we only ever upload surfaces for SOL. */
97 has_surfaces = linked_xfb_info->NumOutputs != 0;
98 }
99
100 /* Skip making a binding table if we don't have anything to put in it. */
101 if (!has_surfaces) {
102 if (brw->gs.bind_bo_offset != 0) {
103 brw->state.dirty.brw |= BRW_NEW_GS_BINDING_TABLE;
104 brw->gs.bind_bo_offset = 0;
105 }
106 return;
107 }
108
109 /* Might want to calculate nr_surfaces first, to avoid taking up so much
110 * space for the binding table.
111 */
112 bind = brw_state_batch(brw, AUB_TRACE_BINDING_TABLE,
113 sizeof(uint32_t) * BRW_MAX_GS_SURFACES,
114 32, &brw->gs.bind_bo_offset);
115
116 /* BRW_NEW_SURFACES */
117 memcpy(bind, brw->gs.surf_offset, BRW_MAX_GS_SURFACES * sizeof(uint32_t));
118
119 brw->state.dirty.brw |= BRW_NEW_GS_BINDING_TABLE;
120 }
121
122 const struct brw_tracked_state gen6_gs_binding_table = {
123 .dirty = {
124 .mesa = 0,
125 .brw = (BRW_NEW_BATCH |
126 BRW_NEW_VERTEX_PROGRAM |
127 BRW_NEW_SURFACES),
128 .cache = 0
129 },
130 .emit = brw_gs_upload_binding_table,
131 };
132
133 static void
gen6_update_sol_indices(struct brw_context * brw)134 gen6_update_sol_indices(struct brw_context *brw)
135 {
136 struct intel_context *intel = &brw->intel;
137
138 BEGIN_BATCH(4);
139 OUT_BATCH(_3DSTATE_GS_SVB_INDEX << 16 | (4 - 2));
140 OUT_BATCH(0);
141 OUT_BATCH(brw->sol.svbi_0_starting_index); /* BRW_NEW_SOL_INDICES */
142 OUT_BATCH(brw->sol.svbi_0_max_index); /* BRW_NEW_SOL_INDICES */
143 ADVANCE_BATCH();
144 }
145
146 const struct brw_tracked_state gen6_sol_indices = {
147 .dirty = {
148 .mesa = 0,
149 .brw = (BRW_NEW_BATCH |
150 BRW_NEW_SOL_INDICES),
151 .cache = 0
152 },
153 .emit = gen6_update_sol_indices,
154 };
155
156 void
brw_begin_transform_feedback(struct gl_context * ctx,GLenum mode,struct gl_transform_feedback_object * obj)157 brw_begin_transform_feedback(struct gl_context *ctx, GLenum mode,
158 struct gl_transform_feedback_object *obj)
159 {
160 struct brw_context *brw = brw_context(ctx);
161 const struct gl_shader_program *vs_prog =
162 ctx->Shader.CurrentVertexProgram;
163 const struct gl_transform_feedback_info *linked_xfb_info =
164 &vs_prog->LinkedTransformFeedback;
165 struct gl_transform_feedback_object *xfb_obj =
166 ctx->TransformFeedback.CurrentObject;
167
168 unsigned max_index = 0xffffffff;
169
170 /* Compute the maximum number of vertices that we can write without
171 * overflowing any of the buffers currently being used for feedback.
172 */
173 for (int i = 0; i < BRW_MAX_SOL_BUFFERS; ++i) {
174 unsigned stride = linked_xfb_info->BufferStride[i];
175
176 /* Skip any inactive buffers, which have a stride of 0. */
177 if (stride == 0)
178 continue;
179
180 unsigned max_for_this_buffer = xfb_obj->Size[i] / (4 * stride);
181 max_index = MIN2(max_index, max_for_this_buffer);
182 }
183
184 /* Initialize the SVBI 0 register to zero and set the maximum index.
185 * These values will be sent to the hardware on the next draw.
186 */
187 brw->state.dirty.brw |= BRW_NEW_SOL_INDICES;
188 brw->sol.svbi_0_starting_index = 0;
189 brw->sol.svbi_0_max_index = max_index;
190 brw->sol.offset_0_batch_start = 0;
191 }
192
193 void
brw_end_transform_feedback(struct gl_context * ctx,struct gl_transform_feedback_object * obj)194 brw_end_transform_feedback(struct gl_context *ctx,
195 struct gl_transform_feedback_object *obj)
196 {
197 /* After EndTransformFeedback, it's likely that the client program will try
198 * to draw using the contents of the transform feedback buffer as vertex
199 * input. In order for this to work, we need to flush the data through at
200 * least the GS stage of the pipeline, and flush out the render cache. For
201 * simplicity, just do a full flush.
202 */
203 struct brw_context *brw = brw_context(ctx);
204 struct intel_context *intel = &brw->intel;
205 intel_batchbuffer_emit_mi_flush(intel);
206 }
207