567 lines
19 KiB
C
567 lines
19 KiB
C
/**************************************************************************
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*
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* Copyright 2007 VMware, Inc.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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#include "main/bufferobj.h"
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#include "main/image.h"
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#include "main/pbo.h"
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#include "main/readpix.h"
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#include "main/enums.h"
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#include "main/framebuffer.h"
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#include "util/u_inlines.h"
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#include "util/format/u_format.h"
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#include "cso_cache/cso_context.h"
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#include "st_atom.h"
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#include "st_context.h"
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#include "st_cb_bitmap.h"
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#include "st_cb_readpixels.h"
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#include "st_debug.h"
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#include "state_tracker/st_cb_texture.h"
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#include "state_tracker/st_format.h"
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#include "state_tracker/st_pbo.h"
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#include "state_tracker/st_texture.h"
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#include "state_tracker/st_util.h"
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/* The readpixels cache caches a blitted staging texture so that back-to-back
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* calls to glReadPixels with user pointers require less CPU-GPU synchronization.
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*
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* Assumptions:
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*
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* (1) Blits have high synchronization overheads, and it is beneficial to
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* use a single blit of the entire framebuffer instead of many smaller
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* blits (because the smaller blits cannot be batched, and we have to wait
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* for the GPU after each one).
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*
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* (2) texture_map implicitly involves a blit as well (for de-tiling, copy
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* from VRAM, etc.), so that it is beneficial to replace the
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* _mesa_readpixels path as well when possible.
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*
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* Change this #define to true to fill and use the cache whenever possible
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* (this is inefficient and only meant for testing / debugging).
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*/
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#define ALWAYS_READPIXELS_CACHE false
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static boolean
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needs_integer_signed_unsigned_conversion(const struct gl_context *ctx,
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GLenum format, GLenum type)
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{
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struct gl_renderbuffer *rb =
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_mesa_get_read_renderbuffer_for_format(ctx, format);
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assert(rb);
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GLenum srcType = _mesa_get_format_datatype(rb->Format);
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if ((srcType == GL_INT &&
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(type == GL_UNSIGNED_INT ||
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type == GL_UNSIGNED_SHORT ||
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type == GL_UNSIGNED_BYTE)) ||
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(srcType == GL_UNSIGNED_INT &&
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(type == GL_INT ||
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type == GL_SHORT ||
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type == GL_BYTE))) {
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return TRUE;
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}
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return FALSE;
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}
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static bool
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try_pbo_readpixels(struct st_context *st, struct gl_renderbuffer *rb,
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bool invert_y,
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GLint x, GLint y, GLsizei width, GLsizei height,
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GLenum gl_format,
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enum pipe_format src_format, enum pipe_format dst_format,
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const struct gl_pixelstore_attrib *pack, void *pixels)
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{
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struct pipe_context *pipe = st->pipe;
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struct pipe_screen *screen = st->screen;
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struct cso_context *cso = st->cso_context;
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struct pipe_surface *surface = rb->surface;
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struct pipe_resource *texture = rb->texture;
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const struct util_format_description *desc;
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struct st_pbo_addresses addr;
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struct pipe_framebuffer_state fb;
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enum pipe_texture_target view_target;
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bool success = false;
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/* Make sure we have stencil format in case of GL_STENCIL_INDEX to
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* create correct type of a sampler view.
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*/
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if (gl_format == GL_STENCIL_INDEX)
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src_format = util_format_stencil_only(src_format);
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if (texture->nr_samples > 1)
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return false;
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if (!screen->is_format_supported(screen, dst_format, PIPE_BUFFER, 0, 0,
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PIPE_BIND_SHADER_IMAGE))
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return false;
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desc = util_format_description(dst_format);
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/* Compute PBO addresses */
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addr.bytes_per_pixel = desc->block.bits / 8;
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addr.xoffset = x;
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addr.yoffset = y;
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addr.width = width;
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addr.height = height;
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addr.depth = 1;
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if (!st_pbo_addresses_pixelstore(st, GL_TEXTURE_2D, false, pack, pixels, &addr))
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return false;
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cso_save_state(cso, (CSO_BIT_FRAGMENT_SAMPLERS |
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CSO_BIT_BLEND |
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CSO_BIT_VERTEX_ELEMENTS |
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CSO_BIT_FRAMEBUFFER |
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CSO_BIT_VIEWPORT |
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CSO_BIT_RASTERIZER |
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CSO_BIT_DEPTH_STENCIL_ALPHA |
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CSO_BIT_STREAM_OUTPUTS |
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(st->active_queries ? CSO_BIT_PAUSE_QUERIES : 0) |
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CSO_BIT_SAMPLE_MASK |
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CSO_BIT_MIN_SAMPLES |
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CSO_BIT_RENDER_CONDITION |
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CSO_BITS_ALL_SHADERS));
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cso_set_sample_mask(cso, ~0);
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cso_set_min_samples(cso, 1);
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cso_set_render_condition(cso, NULL, FALSE, 0);
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/* Set up the sampler_view */
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{
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struct pipe_sampler_view templ;
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struct pipe_sampler_view *sampler_view;
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struct pipe_sampler_state sampler = {0};
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const struct pipe_sampler_state *samplers[1] = {&sampler};
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u_sampler_view_default_template(&templ, texture, src_format);
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switch (texture->target) {
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case PIPE_TEXTURE_CUBE:
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case PIPE_TEXTURE_CUBE_ARRAY:
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view_target = PIPE_TEXTURE_2D_ARRAY;
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break;
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default:
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view_target = texture->target;
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break;
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}
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templ.target = view_target;
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templ.u.tex.first_level = surface->u.tex.level;
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templ.u.tex.last_level = templ.u.tex.first_level;
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if (view_target != PIPE_TEXTURE_3D) {
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templ.u.tex.first_layer = surface->u.tex.first_layer;
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templ.u.tex.last_layer = templ.u.tex.first_layer;
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} else {
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addr.constants.layer_offset = surface->u.tex.first_layer;
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}
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sampler_view = pipe->create_sampler_view(pipe, texture, &templ);
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if (sampler_view == NULL)
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goto fail;
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pipe->set_sampler_views(pipe, PIPE_SHADER_FRAGMENT, 0, 1, 0,
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false, &sampler_view);
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st->state.num_sampler_views[PIPE_SHADER_FRAGMENT] =
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MAX2(st->state.num_sampler_views[PIPE_SHADER_FRAGMENT], 1);
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pipe_sampler_view_reference(&sampler_view, NULL);
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cso_set_samplers(cso, PIPE_SHADER_FRAGMENT, 1, samplers);
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}
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/* Set up destination image */
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{
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struct pipe_image_view image;
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memset(&image, 0, sizeof(image));
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image.resource = addr.buffer;
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image.format = dst_format;
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image.access = PIPE_IMAGE_ACCESS_WRITE;
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image.shader_access = PIPE_IMAGE_ACCESS_WRITE;
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image.u.buf.offset = addr.first_element * addr.bytes_per_pixel;
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image.u.buf.size = (addr.last_element - addr.first_element + 1) *
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addr.bytes_per_pixel;
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pipe->set_shader_images(pipe, PIPE_SHADER_FRAGMENT, 0, 1, 0, &image);
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}
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/* Set up no-attachment framebuffer */
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memset(&fb, 0, sizeof(fb));
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fb.width = surface->width;
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fb.height = surface->height;
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fb.samples = 1;
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fb.layers = 1;
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cso_set_framebuffer(cso, &fb);
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/* Any blend state would do. Set this just to prevent drivers having
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* blend == NULL.
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*/
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cso_set_blend(cso, &st->pbo.upload_blend);
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cso_set_viewport_dims(cso, fb.width, fb.height, invert_y);
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if (invert_y)
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st_pbo_addresses_invert_y(&addr, fb.height);
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{
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struct pipe_depth_stencil_alpha_state dsa;
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memset(&dsa, 0, sizeof(dsa));
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cso_set_depth_stencil_alpha(cso, &dsa);
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}
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/* Set up the fragment shader */
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{
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void *fs = st_pbo_get_download_fs(st, view_target, src_format, dst_format, addr.depth != 1);
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if (!fs)
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goto fail;
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cso_set_fragment_shader_handle(cso, fs);
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}
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success = st_pbo_draw(st, &addr, fb.width, fb.height);
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/* Buffer written via shader images needs explicit synchronization. */
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pipe->memory_barrier(pipe, PIPE_BARRIER_ALL);
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fail:
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/* Unbind all because st/mesa won't do it if the current shader doesn't
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* use them.
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*/
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cso_restore_state(cso, CSO_UNBIND_FS_SAMPLERVIEWS | CSO_UNBIND_FS_IMAGE0);
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st->state.num_sampler_views[PIPE_SHADER_FRAGMENT] = 0;
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st->ctx->Array.NewVertexElements = true;
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st->dirty |= ST_NEW_FS_CONSTANTS |
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ST_NEW_FS_IMAGES |
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ST_NEW_FS_SAMPLER_VIEWS |
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ST_NEW_VERTEX_ARRAYS;
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return success;
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}
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/**
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* Create a staging texture and blit the requested region to it.
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*/
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static struct pipe_resource *
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blit_to_staging(struct st_context *st, struct gl_renderbuffer *rb,
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bool invert_y,
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GLint x, GLint y, GLsizei width, GLsizei height,
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GLenum format,
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enum pipe_format src_format, enum pipe_format dst_format)
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{
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struct pipe_screen *screen = st->screen;
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struct pipe_resource dst_templ;
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struct pipe_resource *dst;
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struct pipe_blit_info blit;
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/* We are creating a texture of the size of the region being read back.
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* Need to check for NPOT texture support. */
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if (!screen->get_param(screen, PIPE_CAP_NPOT_TEXTURES) &&
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(!util_is_power_of_two_or_zero(width) ||
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!util_is_power_of_two_or_zero(height)))
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return NULL;
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/* create the destination texture */
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memset(&dst_templ, 0, sizeof(dst_templ));
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dst_templ.target = PIPE_TEXTURE_2D;
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dst_templ.format = dst_format;
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if (util_format_is_depth_or_stencil(dst_format))
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dst_templ.bind |= PIPE_BIND_DEPTH_STENCIL;
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else
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dst_templ.bind |= PIPE_BIND_RENDER_TARGET;
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dst_templ.usage = PIPE_USAGE_STAGING;
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st_gl_texture_dims_to_pipe_dims(GL_TEXTURE_2D, width, height, 1,
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&dst_templ.width0, &dst_templ.height0,
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&dst_templ.depth0, &dst_templ.array_size);
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dst = screen->resource_create(screen, &dst_templ);
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if (!dst)
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return NULL;
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memset(&blit, 0, sizeof(blit));
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blit.src.resource = rb->texture;
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blit.src.level = rb->surface->u.tex.level;
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blit.src.format = src_format;
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blit.dst.resource = dst;
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blit.dst.level = 0;
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blit.dst.format = dst->format;
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blit.src.box.x = x;
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blit.dst.box.x = 0;
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blit.src.box.y = y;
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blit.dst.box.y = 0;
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blit.src.box.z = rb->surface->u.tex.first_layer;
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blit.dst.box.z = 0;
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blit.src.box.width = blit.dst.box.width = width;
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blit.src.box.height = blit.dst.box.height = height;
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blit.src.box.depth = blit.dst.box.depth = 1;
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blit.mask = st_get_blit_mask(rb->_BaseFormat, format);
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blit.filter = PIPE_TEX_FILTER_NEAREST;
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blit.scissor_enable = FALSE;
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if (invert_y) {
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blit.src.box.y = rb->Height - blit.src.box.y;
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blit.src.box.height = -blit.src.box.height;
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}
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/* blit */
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st->pipe->blit(st->pipe, &blit);
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return dst;
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}
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static struct pipe_resource *
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try_cached_readpixels(struct st_context *st, struct gl_renderbuffer *rb,
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bool invert_y,
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GLsizei width, GLsizei height,
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GLenum format,
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enum pipe_format src_format, enum pipe_format dst_format)
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{
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struct pipe_resource *src = rb->texture;
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struct pipe_resource *dst = NULL;
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if (ST_DEBUG & DEBUG_NOREADPIXCACHE)
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return NULL;
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/* Reset cache after invalidation or switch of parameters. */
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if (st->readpix_cache.src != src ||
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st->readpix_cache.dst_format != dst_format ||
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st->readpix_cache.level != rb->surface->u.tex.level ||
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st->readpix_cache.layer != rb->surface->u.tex.first_layer) {
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pipe_resource_reference(&st->readpix_cache.src, src);
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pipe_resource_reference(&st->readpix_cache.cache, NULL);
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st->readpix_cache.dst_format = dst_format;
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st->readpix_cache.level = rb->surface->u.tex.level;
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st->readpix_cache.layer = rb->surface->u.tex.first_layer;
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st->readpix_cache.hits = 0;
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}
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/* Decide whether to trigger the cache. */
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if (!st->readpix_cache.cache) {
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if (!rb->use_readpix_cache && !ALWAYS_READPIXELS_CACHE) {
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/* Heuristic: If previous successive calls read at least a fraction
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* of the surface _and_ we read again, trigger the cache.
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*/
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unsigned threshold = MAX2(1, rb->Width * rb->Height / 8);
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if (st->readpix_cache.hits < threshold) {
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st->readpix_cache.hits += width * height;
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return NULL;
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}
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rb->use_readpix_cache = true;
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}
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/* Fill the cache */
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st->readpix_cache.cache = blit_to_staging(st, rb, invert_y,
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0, 0,
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rb->Width,
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rb->Height, format,
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src_format, dst_format);
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}
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/* Return an owning reference to stay consistent with the non-cached path */
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pipe_resource_reference(&dst, st->readpix_cache.cache);
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return dst;
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}
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/**
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* This uses a blit to copy the read buffer to a texture format which matches
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* the format and type combo and then a fast read-back is done using memcpy.
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* We can do arbitrary X/Y/Z/W/0/1 swizzling here as long as there is
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* a format which matches the swizzling.
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*
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* If such a format isn't available, we fall back to _mesa_readpixels.
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*
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* NOTE: Some drivers use a blit to convert between tiled and linear
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* texture layouts during texture uploads/downloads, so the blit
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* we do here should be free in such cases.
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*/
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void
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st_ReadPixels(struct gl_context *ctx, GLint x, GLint y,
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GLsizei width, GLsizei height,
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GLenum format, GLenum type,
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const struct gl_pixelstore_attrib *pack,
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void *pixels)
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{
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struct st_context *st = st_context(ctx);
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struct gl_renderbuffer *rb =
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_mesa_get_read_renderbuffer_for_format(ctx, format);
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struct pipe_context *pipe = st->pipe;
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struct pipe_screen *screen = st->screen;
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struct pipe_resource *src;
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struct pipe_resource *dst = NULL;
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enum pipe_format dst_format, src_format;
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unsigned bind;
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struct pipe_transfer *tex_xfer;
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ubyte *map = NULL;
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int dst_x, dst_y;
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/* Validate state (to be sure we have up-to-date framebuffer surfaces)
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* and flush the bitmap cache prior to reading. */
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st_validate_state(st, ST_PIPELINE_UPDATE_FRAMEBUFFER);
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st_flush_bitmap_cache(st);
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if (!st->prefer_blit_based_texture_transfer) {
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goto fallback;
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}
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/* This must be done after state validation. */
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src = rb->texture;
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/* XXX Fallback for depth-stencil formats due to an incomplete
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* stencil blit implementation in some drivers. */
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if (format == GL_DEPTH_STENCIL) {
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goto fallback;
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}
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/* If the base internal format and the texture format don't match, we have
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* to use the slow path. */
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if (rb->_BaseFormat !=
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_mesa_get_format_base_format(rb->Format)) {
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goto fallback;
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}
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if (_mesa_readpixels_needs_slow_path(ctx, format, type, GL_TRUE)) {
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goto fallback;
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}
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/* Convert the source format to what is expected by ReadPixels
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* and see if it's supported. */
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src_format = util_format_linear(rb->Format);
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src_format = util_format_luminance_to_red(src_format);
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src_format = util_format_intensity_to_red(src_format);
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if (!src_format ||
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!screen->is_format_supported(screen, src_format, src->target,
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src->nr_samples, src->nr_storage_samples,
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PIPE_BIND_SAMPLER_VIEW)) {
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goto fallback;
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}
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if (format == GL_DEPTH_COMPONENT || format == GL_DEPTH_STENCIL)
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bind = PIPE_BIND_DEPTH_STENCIL;
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else
|
|
bind = PIPE_BIND_RENDER_TARGET;
|
|
|
|
/* Choose the destination format by finding the best match
|
|
* for the format+type combo. */
|
|
dst_format = st_choose_matching_format(st, bind, format, type,
|
|
pack->SwapBytes);
|
|
if (dst_format == PIPE_FORMAT_NONE) {
|
|
goto fallback;
|
|
}
|
|
|
|
if (st->pbo.download_enabled && pack->BufferObj) {
|
|
if (try_pbo_readpixels(st, rb,
|
|
_mesa_fb_orientation(ctx->ReadBuffer) == Y_0_TOP,
|
|
x, y, width, height,
|
|
format, src_format, dst_format,
|
|
pack, pixels))
|
|
return;
|
|
}
|
|
|
|
if (needs_integer_signed_unsigned_conversion(ctx, format, type)) {
|
|
goto fallback;
|
|
}
|
|
|
|
/* Cache a staging texture for back-to-back ReadPixels, to avoid CPU-GPU
|
|
* synchronization overhead.
|
|
*/
|
|
dst = try_cached_readpixels(st, rb,
|
|
_mesa_fb_orientation(ctx->ReadBuffer) == Y_0_TOP,
|
|
width, height, format, src_format, dst_format);
|
|
if (dst) {
|
|
dst_x = x;
|
|
dst_y = y;
|
|
} else {
|
|
/* See if the texture format already matches the format and type,
|
|
* in which case the memcpy-based fast path will likely be used and
|
|
* we don't have to blit. */
|
|
if (_mesa_format_matches_format_and_type(rb->Format, format,
|
|
type, pack->SwapBytes, NULL)) {
|
|
goto fallback;
|
|
}
|
|
|
|
dst = blit_to_staging(st, rb,
|
|
_mesa_fb_orientation(ctx->ReadBuffer) == Y_0_TOP,
|
|
x, y, width, height, format,
|
|
src_format, dst_format);
|
|
if (!dst)
|
|
goto fallback;
|
|
|
|
dst_x = 0;
|
|
dst_y = 0;
|
|
}
|
|
|
|
/* map resources */
|
|
pixels = _mesa_map_pbo_dest(ctx, pack, pixels);
|
|
|
|
map = pipe_texture_map_3d(pipe, dst, 0, PIPE_MAP_READ,
|
|
dst_x, dst_y, 0, width, height, 1, &tex_xfer);
|
|
if (!map) {
|
|
_mesa_unmap_pbo_dest(ctx, pack);
|
|
pipe_resource_reference(&dst, NULL);
|
|
goto fallback;
|
|
}
|
|
|
|
/* memcpy data into a user buffer */
|
|
{
|
|
const uint bytesPerRow = width * util_format_get_blocksize(dst_format);
|
|
const int destStride = _mesa_image_row_stride(pack, width, format, type);
|
|
char *dest = _mesa_image_address2d(pack, pixels,
|
|
width, height, format,
|
|
type, 0, 0);
|
|
|
|
if (tex_xfer->stride == bytesPerRow && destStride == bytesPerRow) {
|
|
memcpy(dest, map, bytesPerRow * height);
|
|
} else {
|
|
GLuint row;
|
|
|
|
for (row = 0; row < (unsigned) height; row++) {
|
|
memcpy(dest, map, bytesPerRow);
|
|
map += tex_xfer->stride;
|
|
dest += destStride;
|
|
}
|
|
}
|
|
}
|
|
|
|
pipe_texture_unmap(pipe, tex_xfer);
|
|
_mesa_unmap_pbo_dest(ctx, pack);
|
|
pipe_resource_reference(&dst, NULL);
|
|
return;
|
|
|
|
fallback:
|
|
_mesa_readpixels(ctx, x, y, width, height, format, type, pack, pixels);
|
|
}
|