/* * Copyright © 2012 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. */ #include "intel_batchbuffer.h" #include "brw_context.h" #include "brw_defines.h" #include "brw_multisample_state.h" void gen6_get_sample_position(struct gl_context *ctx, struct gl_framebuffer *fb, GLuint index, GLfloat *result) { uint8_t bits; switch (fb->Visual.samples) { case 1: result[0] = result[1] = 0.5f; return; case 2: bits = brw_multisample_positions_1x_2x >> (8 * index); break; case 4: bits = brw_multisample_positions_4x >> (8 * index); break; case 8: bits = brw_multisample_positions_8x[index >> 2] >> (8 * (index & 3)); break; default: unreachable("Not implemented"); } /* Convert from U0.4 back to a floating point coordinate. */ result[0] = ((bits >> 4) & 0xf) / 16.0f; result[1] = (bits & 0xf) / 16.0f; } /** * Sample index layout shows the numbering of slots in a rectangular * grid of samples with in a pixel. Sample number layout shows the * rectangular grid of samples roughly corresponding to the real sample * locations with in a pixel. Sample number layout matches the sample * index layout in case of 2X and 4x MSAA, but they are different in * case of 8X MSAA. * * 2X MSAA sample index / number layout * --------- * | 0 | 1 | * --------- * * 4X MSAA sample index / number layout * --------- * | 0 | 1 | * --------- * | 2 | 3 | * --------- * * 8X MSAA sample index layout 8x MSAA sample number layout * --------- --------- * | 0 | 1 | | 5 | 2 | * --------- --------- * | 2 | 3 | | 4 | 6 | * --------- --------- * | 4 | 5 | | 0 | 3 | * --------- --------- * | 6 | 7 | | 7 | 1 | * --------- --------- * * A sample map is used to map sample indices to sample numbers. */ void gen6_set_sample_maps(struct gl_context *ctx) { uint8_t map_2x[2] = {0, 1}; uint8_t map_4x[4] = {0, 1, 2, 3}; uint8_t map_8x[8] = {5, 2, 4, 6, 0, 3, 7, 1}; memcpy(ctx->Const.SampleMap2x, map_2x, sizeof(map_2x)); memcpy(ctx->Const.SampleMap4x, map_4x, sizeof(map_4x)); memcpy(ctx->Const.SampleMap8x, map_8x, sizeof(map_8x)); } /** * 3DSTATE_MULTISAMPLE */ void gen6_emit_3dstate_multisample(struct brw_context *brw, unsigned num_samples) { uint32_t number_of_multisamples = 0; uint32_t sample_positions_3210 = 0; uint32_t sample_positions_7654 = 0; assert(brw->gen < 8); switch (num_samples) { case 0: case 1: number_of_multisamples = MS_NUMSAMPLES_1; break; case 4: number_of_multisamples = MS_NUMSAMPLES_4; sample_positions_3210 = brw_multisample_positions_4x; break; case 8: number_of_multisamples = MS_NUMSAMPLES_8; sample_positions_3210 = brw_multisample_positions_8x[0]; sample_positions_7654 = brw_multisample_positions_8x[1]; break; default: unreachable("Unrecognized num_samples in gen6_emit_3dstate_multisample"); } int len = brw->gen >= 7 ? 4 : 3; BEGIN_BATCH(len); OUT_BATCH(_3DSTATE_MULTISAMPLE << 16 | (len - 2)); OUT_BATCH(MS_PIXEL_LOCATION_CENTER | number_of_multisamples); OUT_BATCH(sample_positions_3210); if (brw->gen >= 7) OUT_BATCH(sample_positions_7654); ADVANCE_BATCH(); } unsigned gen6_determine_sample_mask(struct brw_context *brw) { struct gl_context *ctx = &brw->ctx; float coverage = 1.0; float coverage_invert = false; unsigned sample_mask = ~0u; /* BRW_NEW_NUM_SAMPLES */ unsigned num_samples = brw->num_samples; if (ctx->Multisample._Enabled) { if (ctx->Multisample.SampleCoverage) { coverage = ctx->Multisample.SampleCoverageValue; coverage_invert = ctx->Multisample.SampleCoverageInvert; } if (ctx->Multisample.SampleMask) { sample_mask = ctx->Multisample.SampleMaskValue; } } if (num_samples > 1) { int coverage_int = (int) (num_samples * coverage + 0.5); uint32_t coverage_bits = (1 << coverage_int) - 1; if (coverage_invert) coverage_bits ^= (1 << num_samples) - 1; return coverage_bits & sample_mask; } else { return 1; } } /** * 3DSTATE_SAMPLE_MASK */ void gen6_emit_3dstate_sample_mask(struct brw_context *brw, unsigned mask) { BEGIN_BATCH(2); OUT_BATCH(_3DSTATE_SAMPLE_MASK << 16 | (2 - 2)); OUT_BATCH(mask); ADVANCE_BATCH(); } static void upload_multisample_state(struct brw_context *brw) { /* BRW_NEW_NUM_SAMPLES */ gen6_emit_3dstate_multisample(brw, brw->num_samples); gen6_emit_3dstate_sample_mask(brw, gen6_determine_sample_mask(brw)); } const struct brw_tracked_state gen6_multisample_state = { .dirty = { .mesa = _NEW_MULTISAMPLE, .brw = BRW_NEW_CONTEXT | BRW_NEW_NUM_SAMPLES, }, .emit = upload_multisample_state };