X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fmesa%2Fstate_tracker%2Fst_cb_readpixels.c;h=18ea43fa71a1c11e5d517c765576974058953ea2;hb=d082c5324914212f76e45be497229c7a0681f706;hp=6b824b1615e0ecea8f15c1a0e849c35eace1f18b;hpb=94780b5ee6dc118e22c29b5543c4db8e0ab1f393;p=mesa.git diff --git a/src/mesa/state_tracker/st_cb_readpixels.c b/src/mesa/state_tracker/st_cb_readpixels.c index 6b824b1615e..18ea43fa71a 100644 --- a/src/mesa/state_tracker/st_cb_readpixels.c +++ b/src/mesa/state_tracker/st_cb_readpixels.c @@ -1,6 +1,6 @@ /************************************************************************** * - * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas. + * Copyright 2007 VMware, Inc. * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a @@ -18,42 +18,242 @@ * 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 TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR + * 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" + +static boolean +needs_integer_signed_unsigned_conversion(const struct gl_context *ctx, + GLenum format, GLenum type) +{ + struct gl_renderbuffer *rb = + _mesa_get_read_renderbuffer_for_format(ctx, format); + + assert(rb); + GLenum srcType = _mesa_get_format_datatype(rb->Format); + + if ((srcType == GL_INT && + (type == GL_UNSIGNED_INT || + type == GL_UNSIGNED_SHORT || + type == GL_UNSIGNED_BYTE)) || + (srcType == GL_UNSIGNED_INT && + (type == GL_INT || + type == GL_SHORT || + type == GL_BYTE))) { + return TRUE; + } + + return FALSE; +} /** - * The only special thing we need to do for the state tracker's - * glReadPixels is to validate state (to be sure we have up-to-date - * framebuffer surfaces) and flush the bitmap cache prior to reading. + * 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 *dest) + 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); - _mesa_readpixels(ctx, x, y, width, height, format, type, pack, dest); -} + 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; + } + + if (needs_integer_signed_unsigned_conversion(ctx, format, type)) { + 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) {