| /************************************************************************** |
| * |
| * Copyright 2010 VMware, Inc. |
| * All Rights Reserved. |
| * |
| * 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, sub license, 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 NON-INFRINGEMENT. |
| * IN NO EVENT SHALL THE AUTHORS AND/OR ITS SUPPLIERS 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 "st_context.h" |
| #include "pipe/p_screen.h" |
| #include "pipe/p_context.h" |
| #include "st_atom.h" |
| #include "st_program.h" |
| #include "st_util.h" |
| |
| #include "cso_cache/cso_context.h" |
| #include "util/u_framebuffer.h" |
| #include "main/framebuffer.h" |
| |
| |
| /** |
| * Update the sample locations |
| */ |
| static void |
| update_sample_locations(struct st_context *st) |
| { |
| struct gl_framebuffer *fb = st->ctx->DrawBuffer; |
| |
| if (!st->ctx->Extensions.ARB_sample_locations) |
| return; |
| |
| if (fb->ProgrammableSampleLocations) { |
| unsigned grid_width, grid_height, size, pixel, sample_index; |
| unsigned samples = st->state.fb_num_samples; |
| bool sample_location_pixel_grid = fb->SampleLocationPixelGrid; |
| uint8_t locations[ |
| PIPE_MAX_SAMPLE_LOCATION_GRID_SIZE * |
| PIPE_MAX_SAMPLE_LOCATION_GRID_SIZE * 32]; |
| |
| st->pipe->screen->get_sample_pixel_grid( |
| st->pipe->screen, samples, &grid_width, &grid_height); |
| size = grid_width * grid_height * samples; |
| |
| /** |
| * when a dimension is greater than MAX_SAMPLE_LOCATION_GRID_SIZE, |
| * st->ctx->Driver.GetSamplePixelGrid() returns 1 for both dimensions. |
| */ |
| if (grid_width > MAX_SAMPLE_LOCATION_GRID_SIZE || |
| grid_height > MAX_SAMPLE_LOCATION_GRID_SIZE) |
| sample_location_pixel_grid = false; |
| |
| for (pixel = 0; pixel < grid_width * grid_height; pixel++) { |
| for (sample_index = 0; sample_index < samples; sample_index++) { |
| int table_index = sample_index; |
| float x = 0.5f, y = 0.5f; |
| uint8_t loc; |
| if (sample_location_pixel_grid) |
| table_index = pixel * samples + sample_index; |
| if (fb->SampleLocationTable) { |
| x = fb->SampleLocationTable[table_index*2]; |
| y = fb->SampleLocationTable[table_index*2+1]; |
| } |
| if (st->state.fb_orientation == Y_0_BOTTOM) |
| y = 1.0 - y; |
| |
| loc = roundf(CLAMP(x * 16.0f, 0.0f, 15.0f)); |
| loc |= (int)roundf(CLAMP(y * 16.0f, 0.0f, 15.0f)) << 4; |
| locations[pixel * samples + sample_index] = loc; |
| } |
| } |
| |
| util_sample_locations_flip_y( |
| st->pipe->screen, st->state.fb_height, samples, locations); |
| |
| if (!st->state.enable_sample_locations || |
| st->state.sample_locations_samples != samples || |
| memcmp(locations, st->state.sample_locations, size) != 0) { |
| st->pipe->set_sample_locations( st->pipe, size, locations); |
| |
| st->state.sample_locations_samples = samples; |
| memcpy(st->state.sample_locations, locations, size); |
| } |
| } else if (st->state.enable_sample_locations) { |
| st->pipe->set_sample_locations(st->pipe, 0, NULL); |
| } |
| |
| st->state.enable_sample_locations = fb->ProgrammableSampleLocations; |
| } |
| |
| |
| /* Update the sample mask and locations for MSAA. |
| */ |
| void |
| st_update_sample_state(struct st_context *st) |
| { |
| unsigned sample_mask = 0xffffffff; |
| unsigned sample_count = st->state.fb_num_samples; |
| |
| if (_mesa_is_multisample_enabled(st->ctx) && sample_count > 1) { |
| /* unlike in gallium/d3d10 the mask is only active if msaa is enabled */ |
| if (st->ctx->Multisample.SampleCoverage) { |
| unsigned nr_bits = (unsigned) |
| (st->ctx->Multisample.SampleCoverageValue * (float) sample_count); |
| /* there's lot of ways how to do this. We just use first few bits, |
| * since we have no knowledge of sample positions here. When |
| * app-supplied mask though is used too might need to be smarter. |
| * Also, there's an interface restriction here in theory it is |
| * encouraged this mask not be the same at each pixel. |
| */ |
| sample_mask = (1 << nr_bits) - 1; |
| if (st->ctx->Multisample.SampleCoverageInvert) |
| sample_mask = ~sample_mask; |
| } |
| if (st->ctx->Multisample.SampleMask) |
| sample_mask &= st->ctx->Multisample.SampleMaskValue; |
| } |
| |
| cso_set_sample_mask(st->cso_context, sample_mask); |
| |
| update_sample_locations(st); |
| } |
| |
| |
| void |
| st_update_sample_shading(struct st_context *st) |
| { |
| if (!st->fp) |
| return; |
| |
| if (!st->ctx->Extensions.ARB_sample_shading) |
| return; |
| |
| cso_set_min_samples(st->cso_context, |
| _mesa_get_min_invocations_per_fragment(st->ctx, &st->fp->Base)); |
| } |