| /************************************************************************** |
| * |
| * Copyright 2009-2010 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 VMWARE 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. |
| * |
| **************************************************************************/ |
| |
| /** |
| * @file |
| * Framebuffer utility functions. |
| * |
| * @author Brian Paul |
| */ |
| |
| |
| #include "pipe/p_screen.h" |
| #include "pipe/p_state.h" |
| #include "pipe/p_defines.h" |
| #include "util/u_inlines.h" |
| |
| #include "util/u_memory.h" |
| #include "util/u_framebuffer.h" |
| |
| |
| /** |
| * Compare pipe_framebuffer_state objects. |
| * \return TRUE if same, FALSE if different |
| */ |
| boolean |
| util_framebuffer_state_equal(const struct pipe_framebuffer_state *dst, |
| const struct pipe_framebuffer_state *src) |
| { |
| unsigned i; |
| |
| if (dst->width != src->width || |
| dst->height != src->height) |
| return FALSE; |
| |
| if (dst->samples != src->samples || |
| dst->layers != src->layers) |
| return FALSE; |
| |
| if (dst->nr_cbufs != src->nr_cbufs) { |
| return FALSE; |
| } |
| |
| for (i = 0; i < src->nr_cbufs; i++) { |
| if (dst->cbufs[i] != src->cbufs[i]) { |
| return FALSE; |
| } |
| } |
| |
| if (dst->zsbuf != src->zsbuf) { |
| return FALSE; |
| } |
| |
| return TRUE; |
| } |
| |
| |
| /** |
| * Copy framebuffer state from src to dst, updating refcounts. |
| */ |
| void |
| util_copy_framebuffer_state(struct pipe_framebuffer_state *dst, |
| const struct pipe_framebuffer_state *src) |
| { |
| unsigned i; |
| |
| if (src) { |
| dst->width = src->width; |
| dst->height = src->height; |
| |
| dst->samples = src->samples; |
| dst->layers = src->layers; |
| |
| for (i = 0; i < src->nr_cbufs; i++) |
| pipe_surface_reference(&dst->cbufs[i], src->cbufs[i]); |
| |
| /* Set remaining dest cbuf pointers to NULL */ |
| for ( ; i < ARRAY_SIZE(dst->cbufs); i++) |
| pipe_surface_reference(&dst->cbufs[i], NULL); |
| |
| dst->nr_cbufs = src->nr_cbufs; |
| |
| pipe_surface_reference(&dst->zsbuf, src->zsbuf); |
| } else { |
| dst->width = 0; |
| dst->height = 0; |
| |
| dst->samples = 0; |
| dst->layers = 0; |
| |
| for (i = 0 ; i < ARRAY_SIZE(dst->cbufs); i++) |
| pipe_surface_reference(&dst->cbufs[i], NULL); |
| |
| dst->nr_cbufs = 0; |
| |
| pipe_surface_reference(&dst->zsbuf, NULL); |
| } |
| } |
| |
| |
| void |
| util_unreference_framebuffer_state(struct pipe_framebuffer_state *fb) |
| { |
| unsigned i; |
| |
| for (i = 0; i < fb->nr_cbufs; i++) { |
| pipe_surface_reference(&fb->cbufs[i], NULL); |
| } |
| |
| pipe_surface_reference(&fb->zsbuf, NULL); |
| |
| fb->samples = fb->layers = 0; |
| fb->width = fb->height = 0; |
| fb->nr_cbufs = 0; |
| } |
| |
| |
| /* Where multiple sizes are allowed for framebuffer surfaces, find the |
| * minimum width and height of all bound surfaces. |
| */ |
| boolean |
| util_framebuffer_min_size(const struct pipe_framebuffer_state *fb, |
| unsigned *width, |
| unsigned *height) |
| { |
| unsigned w = ~0; |
| unsigned h = ~0; |
| unsigned i; |
| |
| for (i = 0; i < fb->nr_cbufs; i++) { |
| if (!fb->cbufs[i]) |
| continue; |
| |
| w = MIN2(w, fb->cbufs[i]->width); |
| h = MIN2(h, fb->cbufs[i]->height); |
| } |
| |
| if (fb->zsbuf) { |
| w = MIN2(w, fb->zsbuf->width); |
| h = MIN2(h, fb->zsbuf->height); |
| } |
| |
| if (w == ~0u) { |
| *width = 0; |
| *height = 0; |
| return FALSE; |
| } |
| else { |
| *width = w; |
| *height = h; |
| return TRUE; |
| } |
| } |
| |
| |
| /** |
| * Return the number of layers set in the framebuffer state. |
| */ |
| unsigned |
| util_framebuffer_get_num_layers(const struct pipe_framebuffer_state *fb) |
| { |
| unsigned i, num_layers = 0; |
| |
| /** |
| * In the case of ARB_framebuffer_no_attachment |
| * we obtain the number of layers directly from |
| * the framebuffer state. |
| */ |
| if (!(fb->nr_cbufs || fb->zsbuf)) |
| return fb->layers; |
| |
| for (i = 0; i < fb->nr_cbufs; i++) { |
| if (fb->cbufs[i]) { |
| unsigned num = fb->cbufs[i]->u.tex.last_layer - |
| fb->cbufs[i]->u.tex.first_layer + 1; |
| num_layers = MAX2(num_layers, num); |
| } |
| } |
| if (fb->zsbuf) { |
| unsigned num = fb->zsbuf->u.tex.last_layer - |
| fb->zsbuf->u.tex.first_layer + 1; |
| num_layers = MAX2(num_layers, num); |
| } |
| return num_layers; |
| } |
| |
| |
| /** |
| * Return the number of MSAA samples. |
| */ |
| unsigned |
| util_framebuffer_get_num_samples(const struct pipe_framebuffer_state *fb) |
| { |
| unsigned i; |
| |
| /** |
| * In the case of ARB_framebuffer_no_attachment |
| * we obtain the number of samples directly from |
| * the framebuffer state. |
| * |
| * NOTE: fb->samples may wind up as zero due to memset()'s on internal |
| * driver structures on their initialization and so we take the |
| * MAX here to ensure we have a valid number of samples. However, |
| * if samples is legitimately not getting set somewhere |
| * multi-sampling will evidently break. |
| */ |
| if (!(fb->nr_cbufs || fb->zsbuf)) |
| return MAX2(fb->samples, 1); |
| |
| /** |
| * If a driver doesn't advertise PIPE_CAP_SURFACE_SAMPLE_COUNT, |
| * pipe_surface::nr_samples will always be 0. |
| */ |
| for (i = 0; i < fb->nr_cbufs; i++) { |
| if (fb->cbufs[i]) { |
| return MAX3(1, fb->cbufs[i]->texture->nr_samples, |
| fb->cbufs[i]->nr_samples); |
| } |
| } |
| if (fb->zsbuf) { |
| return MAX3(1, fb->zsbuf->texture->nr_samples, |
| fb->zsbuf->nr_samples); |
| } |
| |
| return 1; |
| } |
| |
| |
| /** |
| * Flip the sample location state along the Y axis. |
| */ |
| void |
| util_sample_locations_flip_y(struct pipe_screen *screen, unsigned fb_height, |
| unsigned samples, uint8_t *locations) |
| { |
| unsigned row, i, shift, grid_width, grid_height; |
| uint8_t new_locations[ |
| PIPE_MAX_SAMPLE_LOCATION_GRID_SIZE * |
| PIPE_MAX_SAMPLE_LOCATION_GRID_SIZE * 32]; |
| |
| screen->get_sample_pixel_grid(screen, samples, &grid_width, &grid_height); |
| |
| shift = fb_height % grid_height; |
| |
| for (row = 0; row < grid_height; row++) { |
| unsigned row_size = grid_width * samples; |
| for (i = 0; i < row_size; i++) { |
| unsigned dest_row = grid_height - row - 1; |
| /* this relies on unsigned integer wraparound behaviour */ |
| dest_row = (dest_row - shift) % grid_height; |
| new_locations[dest_row * row_size + i] = locations[row * row_size + i]; |
| } |
| } |
| |
| memcpy(locations, new_locations, grid_width * grid_height * samples); |
| } |