| /* |
| * 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" |
| #include "main/framebuffer.h" |
| |
| void |
| gen6_get_sample_position(struct gl_context *ctx, |
| struct gl_framebuffer *fb, |
| GLuint index, GLfloat *result) |
| { |
| uint8_t bits; |
| |
| switch (_mesa_geometric_samples(fb)) { |
| 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; |
| case 16: |
| bits = brw_multisample_positions_16x[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 | |
| * --------- --------- |
| * |
| * 16X MSAA sample index layout 16x MSAA sample number layout |
| * ----------------- ----------------- |
| * | 0 | 1 | 2 | 3 | |15 |10 | 9 | 7 | |
| * ----------------- ----------------- |
| * | 4 | 5 | 6 | 7 | | 4 | 1 | 3 |13 | |
| * ----------------- ----------------- |
| * | 8 | 9 |10 |11 | |12 | 2 | 0 | 6 | |
| * ----------------- ----------------- |
| * |12 |13 |14 |15 | |11 | 8 | 5 |14 | |
| * ----------------- ----------------- |
| * |
| * 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] = {3, 7, 5, 0, 1, 2, 4, 6}; |
| uint8_t map_16x[16] = { 15, 10, 9, 7, 4, 1, 3, 13, |
| 12, 2, 0, 6, 11, 8, 5, 14 }; |
| |
| 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)); |
| memcpy(ctx->Const.SampleMap16x, map_16x, sizeof(map_16x)); |
| } |
| |
| /** |
| * 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 = 1.0f; |
| float coverage_invert = false; |
| unsigned sample_mask = ~0u; |
| |
| /* BRW_NEW_NUM_SAMPLES */ |
| unsigned num_samples = brw->num_samples; |
| |
| if (_mesa_is_multisample_enabled(ctx)) { |
| 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 + 0.5f); |
| 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_BLORP | |
| BRW_NEW_CONTEXT | |
| BRW_NEW_NUM_SAMPLES, |
| }, |
| .emit = upload_multisample_state |
| }; |
