*
**************************************************************************/
+#include "main/bufferobj.h"
#include "main/image.h"
#include "main/pbo.h"
#include "main/imports.h"
#include "main/framebuffer.h"
#include "util/u_inlines.h"
#include "util/u_format.h"
+#include "cso_cache/cso_context.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 "st_debug.h"
#include "state_tracker/st_cb_texture.h"
#include "state_tracker/st_format.h"
+#include "state_tracker/st_pbo.h"
#include "state_tracker/st_texture.h"
+/* The readpixels cache caches a blitted staging texture so that back-to-back
+ * calls to glReadPixels with user pointers require less CPU-GPU synchronization.
+ *
+ * Assumptions:
+ *
+ * (1) Blits have high synchronization overheads, and it is beneficial to
+ * use a single blit of the entire framebuffer instead of many smaller
+ * blits (because the smaller blits cannot be batched, and we have to wait
+ * for the GPU after each one).
+ *
+ * (2) transfer_map implicitly involves a blit as well (for de-tiling, copy
+ * from VRAM, etc.), so that it is beneficial to replace the
+ * _mesa_readpixels path as well when possible.
+ *
+ * Change this #define to true to fill and use the cache whenever possible
+ * (this is inefficient and only meant for testing / debugging).
+ */
+#define ALWAYS_READPIXELS_CACHE false
+
static boolean
needs_integer_signed_unsigned_conversion(const struct gl_context *ctx,
GLenum format, GLenum type)
return FALSE;
}
+static bool
+try_pbo_readpixels(struct st_context *st, struct st_renderbuffer *strb,
+ bool invert_y,
+ GLint x, GLint y, GLsizei width, GLsizei height,
+ enum pipe_format src_format, enum pipe_format dst_format,
+ const struct gl_pixelstore_attrib *pack, void *pixels)
+{
+ struct pipe_context *pipe = st->pipe;
+ struct pipe_screen *screen = pipe->screen;
+ struct cso_context *cso = st->cso_context;
+ struct pipe_surface *surface = strb->surface;
+ struct pipe_resource *texture = strb->texture;
+ const struct util_format_description *desc;
+ struct st_pbo_addresses addr;
+ struct pipe_framebuffer_state fb;
+ enum pipe_texture_target view_target;
+ bool success = false;
+
+ if (texture->nr_samples > 1)
+ return false;
+
+ if (!screen->is_format_supported(screen, dst_format, PIPE_TEXTURE_2D,
+ texture->nr_samples,
+ PIPE_BIND_SHADER_IMAGE))
+ return false;
+
+ desc = util_format_description(dst_format);
+
+ /* Compute PBO addresses */
+ addr.bytes_per_pixel = desc->block.bits / 8;
+ addr.xoffset = x;
+ addr.yoffset = y;
+ addr.width = width;
+ addr.height = height;
+ addr.depth = 1;
+ if (!st_pbo_addresses_pixelstore(st, GL_TEXTURE_2D, false, pack, pixels, &addr))
+ return false;
+
+ cso_save_state(cso, (CSO_BIT_FRAGMENT_SAMPLER_VIEWS |
+ CSO_BIT_FRAGMENT_SAMPLERS |
+ CSO_BIT_FRAGMENT_IMAGE0 |
+ CSO_BIT_VERTEX_ELEMENTS |
+ CSO_BIT_AUX_VERTEX_BUFFER_SLOT |
+ CSO_BIT_FRAMEBUFFER |
+ CSO_BIT_VIEWPORT |
+ CSO_BIT_RASTERIZER |
+ CSO_BIT_DEPTH_STENCIL_ALPHA |
+ CSO_BIT_STREAM_OUTPUTS |
+ CSO_BIT_PAUSE_QUERIES |
+ CSO_BITS_ALL_SHADERS));
+ cso_save_constant_buffer_slot0(cso, PIPE_SHADER_FRAGMENT);
+
+ /* Set up the sampler_view */
+ {
+ struct pipe_sampler_view templ;
+ struct pipe_sampler_view *sampler_view;
+ struct pipe_sampler_state sampler = {0};
+ const struct pipe_sampler_state *samplers[1] = {&sampler};
+
+ u_sampler_view_default_template(&templ, texture, src_format);
+
+ switch (texture->target) {
+ case PIPE_TEXTURE_CUBE:
+ case PIPE_TEXTURE_CUBE_ARRAY:
+ view_target = PIPE_TEXTURE_2D_ARRAY;
+ break;
+ default:
+ view_target = texture->target;
+ break;
+ }
+
+ templ.target = view_target;
+ templ.u.tex.first_level = surface->u.tex.level;
+ templ.u.tex.last_level = templ.u.tex.first_level;
+
+ if (view_target != PIPE_TEXTURE_3D) {
+ templ.u.tex.first_layer = surface->u.tex.first_layer;
+ templ.u.tex.last_layer = templ.u.tex.last_layer;
+ } else {
+ addr.constants.layer_offset = surface->u.tex.first_layer;
+ }
+
+ sampler_view = pipe->create_sampler_view(pipe, texture, &templ);
+ if (sampler_view == NULL)
+ goto fail;
+
+ cso_set_sampler_views(cso, PIPE_SHADER_FRAGMENT, 1, &sampler_view);
+
+ pipe_sampler_view_reference(&sampler_view, NULL);
+
+ cso_set_samplers(cso, PIPE_SHADER_FRAGMENT, 1, samplers);
+ }
+
+ /* Set up destination image */
+ {
+ struct pipe_image_view image;
+
+ memset(&image, 0, sizeof(image));
+ image.resource = addr.buffer;
+ image.format = dst_format;
+ image.access = PIPE_IMAGE_ACCESS_WRITE;
+ image.u.buf.first_element = addr.first_element;
+ image.u.buf.last_element = addr.last_element;
+
+ cso_set_shader_images(cso, PIPE_SHADER_FRAGMENT, 0, 1, &image);
+ }
+
+ /* Set up no-attachment framebuffer */
+ memset(&fb, 0, sizeof(fb));
+ fb.width = surface->width;
+ fb.height = surface->height;
+ fb.samples = 1;
+ fb.layers = 1;
+ cso_set_framebuffer(cso, &fb);
+
+ cso_set_viewport_dims(cso, fb.width, fb.height, invert_y);
+
+ if (invert_y)
+ st_pbo_addresses_invert_y(&addr, fb.height);
+
+ {
+ struct pipe_depth_stencil_alpha_state dsa;
+ memset(&dsa, 0, sizeof(dsa));
+ cso_set_depth_stencil_alpha(cso, &dsa);
+ }
+
+ /* Set up the fragment shader */
+ {
+ void *fs = st_pbo_get_download_fs(st, view_target);
+ if (!fs)
+ goto fail;
+
+ cso_set_fragment_shader_handle(cso, fs);
+ }
+
+ success = st_pbo_draw(st, &addr, fb.width, fb.height);
+
+ /* Buffer written via shader images needs explicit synchronization. */
+ pipe->memory_barrier(pipe, PIPE_BARRIER_ALL);
+
+fail:
+ cso_restore_state(cso);
+ cso_restore_constant_buffer_slot0(cso, PIPE_SHADER_FRAGMENT);
+
+ return success;
+}
+
+/* Invalidate the readpixels cache to ensure we don't read stale data.
+ */
+void st_invalidate_readpix_cache(struct st_context *st)
+{
+ pipe_resource_reference(&st->readpix_cache.src, NULL);
+ pipe_resource_reference(&st->readpix_cache.cache, NULL);
+}
+
+/**
+ * Create a staging texture and blit the requested region to it.
+ */
+static struct pipe_resource *
+blit_to_staging(struct st_context *st, struct st_renderbuffer *strb,
+ bool invert_y,
+ GLint x, GLint y, GLsizei width, GLsizei height,
+ GLenum format,
+ enum pipe_format src_format, enum pipe_format dst_format)
+{
+ struct pipe_context *pipe = st->pipe;
+ struct pipe_screen *screen = pipe->screen;
+ struct pipe_resource dst_templ;
+ struct pipe_resource *dst;
+ struct pipe_blit_info blit;
+
+ /* 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)))
+ return NULL;
+
+ /* 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 = PIPE_BIND_TRANSFER_READ;
+ if (util_format_is_depth_or_stencil(dst_format))
+ dst_templ.bind |= PIPE_BIND_DEPTH_STENCIL;
+ else
+ dst_templ.bind |= PIPE_BIND_RENDER_TARGET;
+ 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)
+ return NULL;
+
+ memset(&blit, 0, sizeof(blit));
+ blit.src.resource = strb->texture;
+ 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(strb->Base._BaseFormat, format);
+ blit.filter = PIPE_TEX_FILTER_NEAREST;
+ blit.scissor_enable = FALSE;
+
+ if (invert_y) {
+ blit.src.box.y = strb->Base.Height - blit.src.box.y;
+ blit.src.box.height = -blit.src.box.height;
+ }
+
+ /* blit */
+ st->pipe->blit(st->pipe, &blit);
+
+ return dst;
+}
+
+static struct pipe_resource *
+try_cached_readpixels(struct st_context *st, struct st_renderbuffer *strb,
+ bool invert_y,
+ GLsizei width, GLsizei height,
+ GLenum format,
+ enum pipe_format src_format, enum pipe_format dst_format)
+{
+ struct pipe_resource *src = strb->texture;
+ struct pipe_resource *dst = NULL;
+
+ if (ST_DEBUG & DEBUG_NOREADPIXCACHE)
+ return NULL;
+
+ /* Reset cache after invalidation or switch of parameters. */
+ if (st->readpix_cache.src != src ||
+ st->readpix_cache.dst_format != dst_format ||
+ st->readpix_cache.level != strb->surface->u.tex.level ||
+ st->readpix_cache.layer != strb->surface->u.tex.first_layer) {
+ pipe_resource_reference(&st->readpix_cache.src, src);
+ pipe_resource_reference(&st->readpix_cache.cache, NULL);
+ st->readpix_cache.dst_format = dst_format;
+ st->readpix_cache.level = strb->surface->u.tex.level;
+ st->readpix_cache.layer = strb->surface->u.tex.first_layer;
+ st->readpix_cache.hits = 0;
+ }
+
+ /* Decide whether to trigger the cache. */
+ if (!st->readpix_cache.cache) {
+ if (!strb->use_readpix_cache && !ALWAYS_READPIXELS_CACHE) {
+ /* Heuristic: If previous successive calls read at least a fraction
+ * of the surface _and_ we read again, trigger the cache.
+ */
+ unsigned threshold = MAX2(1, strb->Base.Width * strb->Base.Height / 8);
+
+ if (st->readpix_cache.hits < threshold) {
+ st->readpix_cache.hits += width * height;
+ return NULL;
+ }
+
+ strb->use_readpix_cache = true;
+ }
+
+ /* Fill the cache */
+ st->readpix_cache.cache = blit_to_staging(st, strb, invert_y,
+ 0, 0,
+ strb->Base.Width,
+ strb->Base.Height, format,
+ src_format, dst_format);
+ }
+
+ /* Return an owning reference to stay consistent with the non-cached path */
+ pipe_resource_reference(&dst, st->readpix_cache.cache);
+
+ return dst;
+}
+
/**
* 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 do here should be free in such cases.
*/
static void
-st_readpixels(struct gl_context *ctx, GLint x, GLint y,
+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)
+ void *pixels)
{
struct st_context *st = st_context(ctx);
struct gl_renderbuffer *rb =
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;
+ bool window;
/* 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_validate_state(st, ST_PIPELINE_RENDER);
st_flush_bitmap_cache(st);
if (!st->prefer_blit_based_texture_transfer) {
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 !=
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, NULL)) {
- 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);
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);
+ if (st->pbo.download_enabled && _mesa_is_bufferobj(pack->BufferObj)) {
+ if (try_pbo_readpixels(st, strb,
+ st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP,
+ x, y, width, height,
+ src_format, dst_format,
+ pack, pixels))
+ return;
+ }
- dst = screen->resource_create(screen, &dst_templ);
- if (!dst) {
+ if (needs_integer_signed_unsigned_conversion(ctx, format, type)) {
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;
+ /* Cache a staging texture for back-to-back ReadPixels, to avoid CPU-GPU
+ * synchronization overhead.
+ */
+ dst = try_cached_readpixels(st, strb,
+ st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP,
+ width, height, format, src_format, dst_format);
+ if (dst) {
+ window = false;
+ } 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;
+ }
- 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;
- }
+ dst = blit_to_staging(st, strb,
+ st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP,
+ x, y, width, height, format,
+ src_format, dst_format);
+ if (!dst)
+ goto fallback;
- /* blit */
- st->pipe->blit(st->pipe, &blit);
+ window = true;
+ }
/* map resources */
pixels = _mesa_map_pbo_dest(ctx, pack, pixels);
goto fallback;
}
+ if (!window)
+ map += y * tex_xfer->stride + x * util_format_get_blocksize(dst_format);
+
/* 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,
+ void *dest = _mesa_image_address2d(pack, pixels,
width, height, format,
- type, 0, row, 0);
+ type, row, 0);
memcpy(dest, map, bytesPerRow);
map += tex_xfer->stride;
}
void st_init_readpixels_functions(struct dd_function_table *functions)
{
- functions->ReadPixels = st_readpixels;
+ functions->ReadPixels = st_ReadPixels;
}
projects / mesa.git / blobdiff