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 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 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 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 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 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
