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| /************************************************************************** |
| * |
| * Copyright 2007 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. |
| * |
| **************************************************************************/ |
| |
| #include "main/image.h" |
| #include "main/pbo.h" |
| #include "main/imports.h" |
| #include "main/readpix.h" |
| #include "main/enums.h" |
| #include "main/framebuffer.h" |
| #include "util/u_inlines.h" |
| #include "util/u_format.h" |
| |
| #include "st_cb_fbo.h" |
| #include "st_atom.h" |
| #include "st_context.h" |
| #include "st_cb_bitmap.h" |
| #include "st_cb_readpixels.h" |
| #include "state_tracker/st_cb_texture.h" |
| #include "state_tracker/st_format.h" |
| #include "state_tracker/st_texture.h" |
| |
| |
| /** |
| * This uses a blit to copy the read buffer to a texture format which matches |
| * the format and type combo and then a fast read-back is done using memcpy. |
| * We can do arbitrary X/Y/Z/W/0/1 swizzling here as long as there is |
| * a format which matches the swizzling. |
| * |
| * If such a format isn't available, we fall back to _mesa_readpixels. |
| * |
| * NOTE: Some drivers use a blit to convert between tiled and linear |
| * texture layouts during texture uploads/downloads, so the blit |
| * we do here should be free in such cases. |
| */ |
| static void |
| st_readpixels(struct gl_context *ctx, GLint x, GLint y, |
| GLsizei width, GLsizei height, |
| GLenum format, GLenum type, |
| const struct gl_pixelstore_attrib *pack, |
| GLvoid *pixels) |
| { |
| struct st_context *st = st_context(ctx); |
| struct gl_renderbuffer *rb = |
| _mesa_get_read_renderbuffer_for_format(ctx, format); |
| struct st_renderbuffer *strb = st_renderbuffer(rb); |
| struct pipe_context *pipe = st->pipe; |
| struct pipe_screen *screen = pipe->screen; |
| struct pipe_resource *src; |
| struct pipe_resource *dst = NULL; |
| struct pipe_resource dst_templ; |
| enum pipe_format dst_format, src_format; |
| struct pipe_blit_info blit; |
| unsigned bind = PIPE_BIND_TRANSFER_READ; |
| struct pipe_transfer *tex_xfer; |
| ubyte *map = NULL; |
| |
| /* Validate state (to be sure we have up-to-date framebuffer surfaces) |
| * and flush the bitmap cache prior to reading. */ |
| st_validate_state(st); |
| st_flush_bitmap_cache(st); |
| |
| if (!st->prefer_blit_based_texture_transfer) { |
| goto fallback; |
| } |
| |
| /* This must be done after state validation. */ |
| src = strb->texture; |
| |
| /* XXX Fallback for depth-stencil formats due to an incomplete |
| * stencil blit implementation in some drivers. */ |
| if (format == GL_DEPTH_STENCIL) { |
| goto fallback; |
| } |
| |
| /* We are creating a texture of the size of the region being read back. |
| * Need to check for NPOT texture support. */ |
| if (!screen->get_param(screen, PIPE_CAP_NPOT_TEXTURES) && |
| (!util_is_power_of_two(width) || |
| !util_is_power_of_two(height))) { |
| goto fallback; |
| } |
| |
| /* If the base internal format and the texture format don't match, we have |
| * to use the slow path. */ |
| if (rb->_BaseFormat != |
| _mesa_get_format_base_format(rb->Format)) { |
| goto fallback; |
| } |
| |
| /* 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)) { |
| goto fallback; |
| } |
| |
| if (_mesa_readpixels_needs_slow_path(ctx, format, type, GL_TRUE)) { |
| goto fallback; |
| } |
| |
| /* Convert the source format to what is expected by ReadPixels |
| * and see if it's supported. */ |
| src_format = util_format_linear(src->format); |
| src_format = util_format_luminance_to_red(src_format); |
| src_format = util_format_intensity_to_red(src_format); |
| |
| if (!src_format || |
| !screen->is_format_supported(screen, src_format, src->target, |
| src->nr_samples, |
| PIPE_BIND_SAMPLER_VIEW)) { |
| goto fallback; |
| } |
| |
| if (format == GL_DEPTH_COMPONENT || format == GL_DEPTH_STENCIL) |
| bind |= PIPE_BIND_DEPTH_STENCIL; |
| 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; |
| } |
| |
| /* create the destination texture */ |
| memset(&dst_templ, 0, sizeof(dst_templ)); |
| dst_templ.target = PIPE_TEXTURE_2D; |
| dst_templ.format = dst_format; |
| dst_templ.bind = bind; |
| dst_templ.usage = PIPE_USAGE_STAGING; |
| |
| st_gl_texture_dims_to_pipe_dims(GL_TEXTURE_2D, width, height, 1, |
| &dst_templ.width0, &dst_templ.height0, |
| &dst_templ.depth0, &dst_templ.array_size); |
| |
| dst = screen->resource_create(screen, &dst_templ); |
| if (!dst) { |
| goto fallback; |
| } |
| |
| memset(&blit, 0, sizeof(blit)); |
| blit.src.resource = src; |
| blit.src.level = strb->surface->u.tex.level; |
| blit.src.format = src_format; |
| blit.dst.resource = dst; |
| blit.dst.level = 0; |
| blit.dst.format = dst->format; |
| blit.src.box.x = x; |
| blit.dst.box.x = 0; |
| blit.src.box.y = y; |
| blit.dst.box.y = 0; |
| blit.src.box.z = strb->surface->u.tex.first_layer; |
| blit.dst.box.z = 0; |
| blit.src.box.width = blit.dst.box.width = width; |
| blit.src.box.height = blit.dst.box.height = height; |
| blit.src.box.depth = blit.dst.box.depth = 1; |
| blit.mask = st_get_blit_mask(rb->_BaseFormat, format); |
| blit.filter = PIPE_TEX_FILTER_NEAREST; |
| blit.scissor_enable = FALSE; |
| |
| if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) { |
| blit.src.box.y = rb->Height - blit.src.box.y; |
| blit.src.box.height = -blit.src.box.height; |
| } |
| |
| /* blit */ |
| st->pipe->blit(st->pipe, &blit); |
| |
| /* map resources */ |
| pixels = _mesa_map_pbo_dest(ctx, pack, pixels); |
| |
| map = pipe_transfer_map_3d(pipe, dst, 0, PIPE_TRANSFER_READ, |
| 0, 0, 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); |
| GLuint row; |
| |
| for (row = 0; row < (unsigned) height; row++) { |
| GLvoid *dest = _mesa_image_address3d(pack, pixels, |
| width, height, format, |
| type, 0, row, 0); |
| memcpy(dest, map, bytesPerRow); |
| map += tex_xfer->stride; |
| } |
| } |
| |
| pipe_transfer_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); |
| } |
| |
| void st_init_readpixels_functions(struct dd_function_table *functions) |
| { |
| functions->ReadPixels = st_readpixels; |
| } |