+++ /dev/null
-/*
- * Mesa 3-D graphics library
- * Version: 7.0.3
- *
- * Copyright (C) 1999-2007 Brian Paul 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, sublicense,
- * 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 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 NONINFRINGEMENT. IN NO EVENT SHALL
- * BRIAN PAUL 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/glheader.h"
-#include "main/colormac.h"
-#include "main/feedback.h"
-#include "main/formats.h"
-#include "main/format_unpack.h"
-#include "main/image.h"
-#include "main/imports.h"
-#include "main/macros.h"
-#include "main/pack.h"
-#include "main/pbo.h"
-#include "main/state.h"
-
-#include "s_context.h"
-#include "s_depth.h"
-#include "s_span.h"
-#include "s_stencil.h"
-
-/**
- * Tries to implement glReadPixels() of GL_DEPTH_COMPONENT using memcpy of the
- * mapping.
- */
-static GLboolean
-fast_read_depth_pixels( struct gl_context *ctx,
- GLint x, GLint y,
- GLsizei width, GLsizei height,
- GLenum type, GLvoid *pixels,
- const struct gl_pixelstore_attrib *packing )
-{
- struct gl_framebuffer *fb = ctx->ReadBuffer;
- struct gl_renderbuffer *rb = fb->Attachment[BUFFER_DEPTH].Renderbuffer;
- GLubyte *map, *dst;
- int stride, dstStride, j;
-
- if (ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0)
- return GL_FALSE;
-
- if (packing->SwapBytes)
- return GL_FALSE;
-
- if (_mesa_get_format_datatype(rb->Format) != GL_UNSIGNED_INT)
- return GL_FALSE;
-
- if (!((type == GL_UNSIGNED_SHORT && rb->Format == MESA_FORMAT_Z16) ||
- type == GL_UNSIGNED_INT))
- return GL_FALSE;
-
- ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
- &map, &stride);
-
- dstStride = _mesa_image_row_stride(packing, width, GL_DEPTH_COMPONENT, type);
- dst = (GLubyte *) _mesa_image_address2d(packing, pixels, width, height,
- GL_DEPTH_COMPONENT, type, 0, 0);
-
- for (j = 0; j < height; j++) {
- if (type == GL_UNSIGNED_INT) {
- _mesa_unpack_uint_z_row(rb->Format, width, map, (GLuint *)dst);
- } else {
- ASSERT(type == GL_UNSIGNED_SHORT && rb->Format == MESA_FORMAT_Z16);
- memcpy(dst, map, width * 2);
- }
-
- map += stride;
- dst += dstStride;
- }
- ctx->Driver.UnmapRenderbuffer(ctx, rb);
-
- return GL_TRUE;
-}
-
-/**
- * Read pixels for format=GL_DEPTH_COMPONENT.
- */
-static void
-read_depth_pixels( struct gl_context *ctx,
- GLint x, GLint y,
- GLsizei width, GLsizei height,
- GLenum type, GLvoid *pixels,
- const struct gl_pixelstore_attrib *packing )
-{
- struct gl_framebuffer *fb = ctx->ReadBuffer;
- struct gl_renderbuffer *rb = fb->Attachment[BUFFER_DEPTH].Renderbuffer;
- GLint j;
- GLubyte *dst, *map;
- int dstStride, stride;
-
- if (!rb)
- return;
-
- /* clipping should have been done already */
- ASSERT(x >= 0);
- ASSERT(y >= 0);
- ASSERT(x + width <= (GLint) rb->Width);
- ASSERT(y + height <= (GLint) rb->Height);
- /* width should never be > MAX_WIDTH since we did clipping earlier */
- ASSERT(width <= MAX_WIDTH);
-
- if (fast_read_depth_pixels(ctx, x, y, width, height, type, pixels, packing))
- return;
-
- dstStride = _mesa_image_row_stride(packing, width, GL_DEPTH_COMPONENT, type);
- dst = (GLubyte *) _mesa_image_address2d(packing, pixels, width, height,
- GL_DEPTH_COMPONENT, type, 0, 0);
-
- ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
- &map, &stride);
-
- /* General case (slower) */
- for (j = 0; j < height; j++, y++) {
- GLfloat depthValues[MAX_WIDTH];
- _mesa_unpack_float_z_row(rb->Format, width, map, depthValues);
- _mesa_pack_depth_span(ctx, width, dst, type, depthValues, packing);
-
- dst += dstStride;
- map += stride;
- }
-
- ctx->Driver.UnmapRenderbuffer(ctx, rb);
-}
-
-
-/**
- * Read pixels for format=GL_STENCIL_INDEX.
- */
-static void
-read_stencil_pixels( struct gl_context *ctx,
- GLint x, GLint y,
- GLsizei width, GLsizei height,
- GLenum type, GLvoid *pixels,
- const struct gl_pixelstore_attrib *packing )
-{
- struct gl_framebuffer *fb = ctx->ReadBuffer;
- struct gl_renderbuffer *rb = fb->Attachment[BUFFER_STENCIL].Renderbuffer;
- GLint j;
- GLubyte *map;
- GLint stride;
-
- if (!rb)
- return;
-
- /* width should never be > MAX_WIDTH since we did clipping earlier */
- ASSERT(width <= MAX_WIDTH);
-
- ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
- &map, &stride);
-
- /* process image row by row */
- for (j = 0; j < height; j++) {
- GLvoid *dest;
- GLubyte stencil[MAX_WIDTH];
-
- _mesa_unpack_ubyte_stencil_row(rb->Format, width, map, stencil);
- dest = _mesa_image_address2d(packing, pixels, width, height,
- GL_STENCIL_INDEX, type, j, 0);
-
- _mesa_pack_stencil_span(ctx, width, type, dest, stencil, packing);
-
- map += stride;
- }
-
- ctx->Driver.UnmapRenderbuffer(ctx, rb);
-}
-
-static GLboolean
-fast_read_rgba_pixels_memcpy( struct gl_context *ctx,
- GLint x, GLint y,
- GLsizei width, GLsizei height,
- GLenum format, GLenum type,
- GLvoid *pixels,
- const struct gl_pixelstore_attrib *packing,
- GLbitfield transferOps )
-{
- struct gl_renderbuffer *rb = ctx->ReadBuffer->_ColorReadBuffer;
- GLubyte *dst, *map;
- int dstStride, stride, j, texelBytes;
-
- if (!_mesa_format_matches_format_and_type(rb->Format, format, type))
- return GL_FALSE;
-
- /* check for things we can't handle here */
- if (packing->SwapBytes ||
- packing->LsbFirst) {
- return GL_FALSE;
- }
-
- dstStride = _mesa_image_row_stride(packing, width, format, type);
- dst = (GLubyte *) _mesa_image_address2d(packing, pixels, width, height,
- format, type, 0, 0);
-
- ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
- &map, &stride);
-
- texelBytes = _mesa_get_format_bytes(rb->Format);
- for (j = 0; j < height; j++) {
- memcpy(dst, map, width * texelBytes);
- dst += dstStride;
- map += stride;
- }
-
- ctx->Driver.UnmapRenderbuffer(ctx, rb);
-
- return GL_TRUE;
-}
-
-static GLboolean
-slow_read_rgba_pixels( struct gl_context *ctx,
- GLint x, GLint y,
- GLsizei width, GLsizei height,
- GLenum format, GLenum type,
- GLvoid *pixels,
- const struct gl_pixelstore_attrib *packing,
- GLbitfield transferOps )
-{
- struct gl_renderbuffer *rb = ctx->ReadBuffer->_ColorReadBuffer;
- const gl_format rbFormat = _mesa_get_srgb_format_linear(rb->Format);
- union {
- float f[MAX_WIDTH][4];
- unsigned int i[MAX_WIDTH][4];
- } rgba;
- GLubyte *dst, *map;
- int dstStride, stride, j;
-
- dstStride = _mesa_image_row_stride(packing, width, format, type);
- dst = (GLubyte *) _mesa_image_address2d(packing, pixels, width, height,
- format, type, 0, 0);
-
- ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
- &map, &stride);
-
- for (j = 0; j < height; j++) {
- if (_mesa_is_integer_format(format)) {
- _mesa_unpack_int_rgba_row(rbFormat, width, map, rgba.i);
- _mesa_pack_rgba_span_int(ctx, width, rgba.i, format, type, dst);
- } else {
- _mesa_unpack_rgba_row(rbFormat, width, map, rgba.f);
- _mesa_pack_rgba_span_float(ctx, width, rgba.f, format, type, dst,
- packing, transferOps);
- }
- dst += dstStride;
- map += stride;
- }
-
- ctx->Driver.UnmapRenderbuffer(ctx, rb);
-
- return GL_TRUE;
-}
-
-/*
- * Read R, G, B, A, RGB, L, or LA pixels.
- */
-static void
-read_rgba_pixels( struct gl_context *ctx,
- GLint x, GLint y,
- GLsizei width, GLsizei height,
- GLenum format, GLenum type, GLvoid *pixels,
- const struct gl_pixelstore_attrib *packing )
-{
- GLbitfield transferOps = ctx->_ImageTransferState;
- struct gl_framebuffer *fb = ctx->ReadBuffer;
- struct gl_renderbuffer *rb = fb->_ColorReadBuffer;
-
- if (!rb)
- return;
-
- if ((ctx->Color._ClampReadColor == GL_TRUE || type != GL_FLOAT) &&
- !_mesa_is_integer_format(format)) {
- transferOps |= IMAGE_CLAMP_BIT;
- }
-
- if (!transferOps) {
- /* Try the optimized paths first. */
- if (fast_read_rgba_pixels_memcpy(ctx, x, y, width, height,
- format, type, pixels, packing,
- transferOps)) {
- return;
- }
- }
-
- slow_read_rgba_pixels(ctx, x, y, width, height,
- format, type, pixels, packing, transferOps);
-}
-
-/**
- * For a packed depth/stencil buffer being read as depth/stencil, just memcpy the
- * data (possibly swapping 8/24 vs 24/8 as we go).
- */
-static GLboolean
-fast_read_depth_stencil_pixels(struct gl_context *ctx,
- GLint x, GLint y,
- GLsizei width, GLsizei height,
- GLubyte *dst, int dstStride)
-{
- struct gl_framebuffer *fb = ctx->ReadBuffer;
- struct gl_renderbuffer *rb = fb->Attachment[BUFFER_DEPTH].Renderbuffer;
- struct gl_renderbuffer *stencilRb = fb->Attachment[BUFFER_STENCIL].Renderbuffer;
- GLubyte *map;
- int stride, i;
-
- if (rb != stencilRb)
- return GL_FALSE;
-
- if (rb->Format != MESA_FORMAT_Z24_S8 &&
- rb->Format != MESA_FORMAT_S8_Z24)
- return GL_FALSE;
-
- ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT,
- &map, &stride);
-
- for (i = 0; i < height; i++) {
- _mesa_unpack_uint_24_8_depth_stencil_row(rb->Format, width,
- map, (GLuint *)dst);
- map += stride;
- dst += dstStride;
- }
-
- ctx->Driver.UnmapRenderbuffer(ctx, rb);
-
- return GL_TRUE;
-}
-
-
-/**
- * For non-float-depth and stencil buffers being read as 24/8 depth/stencil,
- * copy the integer data directly instead of converting depth to float and
- * re-packing.
- */
-static GLboolean
-fast_read_depth_stencil_pixels_separate(struct gl_context *ctx,
- GLint x, GLint y,
- GLsizei width, GLsizei height,
- uint32_t *dst, int dstStride)
-{
- struct gl_framebuffer *fb = ctx->ReadBuffer;
- struct gl_renderbuffer *depthRb = fb->Attachment[BUFFER_DEPTH].Renderbuffer;
- struct gl_renderbuffer *stencilRb = fb->Attachment[BUFFER_STENCIL].Renderbuffer;
- GLubyte *depthMap, *stencilMap;
- int depthStride, stencilStride, i, j;
-
- if (_mesa_get_format_datatype(depthRb->Format) != GL_UNSIGNED_INT)
- return GL_FALSE;
-
- ctx->Driver.MapRenderbuffer(ctx, depthRb, x, y, width, height,
- GL_MAP_READ_BIT, &depthMap, &depthStride);
- ctx->Driver.MapRenderbuffer(ctx, stencilRb, x, y, width, height,
- GL_MAP_READ_BIT, &stencilMap, &stencilStride);
-
- for (j = 0; j < height; j++) {
- GLubyte stencilVals[MAX_WIDTH];
-
- _mesa_unpack_uint_z_row(depthRb->Format, width, depthMap, dst);
- _mesa_unpack_ubyte_stencil_row(stencilRb->Format, width,
- stencilMap, stencilVals);
-
- for (i = 0; i < width; i++) {
- dst[i] = (dst[i] & 0xffffff00) | stencilVals[i];
- }
-
- depthMap += depthStride;
- stencilMap += stencilStride;
- dst += dstStride / 4;
- }
-
- ctx->Driver.UnmapRenderbuffer(ctx, depthRb);
- ctx->Driver.UnmapRenderbuffer(ctx, stencilRb);
-
- return GL_TRUE;
-}
-
-static void
-slow_read_depth_stencil_pixels_separate(struct gl_context *ctx,
- GLint x, GLint y,
- GLsizei width, GLsizei height,
- GLenum type,
- const struct gl_pixelstore_attrib *packing,
- GLubyte *dst, int dstStride)
-{
- struct gl_framebuffer *fb = ctx->ReadBuffer;
- struct gl_renderbuffer *depthRb = fb->Attachment[BUFFER_DEPTH].Renderbuffer;
- struct gl_renderbuffer *stencilRb = fb->Attachment[BUFFER_STENCIL].Renderbuffer;
- GLubyte *depthMap, *stencilMap;
- int depthStride, stencilStride, j;
-
- ctx->Driver.MapRenderbuffer(ctx, depthRb, x, y, width, height,
- GL_MAP_READ_BIT, &depthMap, &depthStride);
- ctx->Driver.MapRenderbuffer(ctx, stencilRb, x, y, width, height,
- GL_MAP_READ_BIT, &stencilMap, &stencilStride);
-
- for (j = 0; j < height; j++) {
- GLubyte stencilVals[MAX_WIDTH];
- GLfloat depthVals[MAX_WIDTH];
-
- _mesa_unpack_float_z_row(depthRb->Format, width, depthMap, depthVals);
- _mesa_unpack_ubyte_stencil_row(stencilRb->Format, width,
- stencilMap, stencilVals);
-
- _mesa_pack_depth_stencil_span(ctx, width, type, (GLuint *)dst,
- depthVals, stencilVals, packing);
-
- depthMap += depthStride;
- stencilMap += stencilStride;
- dst += dstStride;
- }
-
- ctx->Driver.UnmapRenderbuffer(ctx, depthRb);
- ctx->Driver.UnmapRenderbuffer(ctx, stencilRb);
-}
-
-
-/**
- * Read combined depth/stencil values.
- * We'll have already done error checking to be sure the expected
- * depth and stencil buffers really exist.
- */
-static void
-read_depth_stencil_pixels(struct gl_context *ctx,
- GLint x, GLint y,
- GLsizei width, GLsizei height,
- GLenum type, GLvoid *pixels,
- const struct gl_pixelstore_attrib *packing )
-{
- const GLboolean scaleOrBias
- = ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0;
- const GLboolean stencilTransfer = ctx->Pixel.IndexShift
- || ctx->Pixel.IndexOffset || ctx->Pixel.MapStencilFlag;
- GLubyte *dst;
- int dstStride;
-
- dst = (GLubyte *) _mesa_image_address2d(packing, pixels,
- width, height,
- GL_DEPTH_STENCIL_EXT,
- type, 0, 0);
- dstStride = _mesa_image_row_stride(packing, width,
- GL_DEPTH_STENCIL_EXT, type);
-
- /* Fast 24/8 reads. */
- if (type == GL_UNSIGNED_INT_24_8 &&
- !scaleOrBias && !stencilTransfer && !packing->SwapBytes) {
- if (fast_read_depth_stencil_pixels(ctx, x, y, width, height,
- dst, dstStride))
- return;
-
- if (fast_read_depth_stencil_pixels_separate(ctx, x, y, width, height,
- (uint32_t *)dst, dstStride))
- return;
- }
-
- slow_read_depth_stencil_pixels_separate(ctx, x, y, width, height,
- type, packing,
- dst, dstStride);
-}
-
-
-
-/**
- * Software fallback routine for ctx->Driver.ReadPixels().
- * By time we get here, all error checking will have been done.
- */
-void
-_swrast_ReadPixels( struct gl_context *ctx,
- GLint x, GLint y, GLsizei width, GLsizei height,
- GLenum format, GLenum type,
- const struct gl_pixelstore_attrib *packing,
- GLvoid *pixels )
-{
- struct gl_pixelstore_attrib clippedPacking = *packing;
-
- if (ctx->NewState)
- _mesa_update_state(ctx);
-
- /* Do all needed clipping here, so that we can forget about it later */
- if (_mesa_clip_readpixels(ctx, &x, &y, &width, &height, &clippedPacking)) {
-
- pixels = _mesa_map_pbo_dest(ctx, &clippedPacking, pixels);
-
- if (pixels) {
- switch (format) {
- case GL_STENCIL_INDEX:
- read_stencil_pixels(ctx, x, y, width, height, type, pixels,
- &clippedPacking);
- break;
- case GL_DEPTH_COMPONENT:
- read_depth_pixels(ctx, x, y, width, height, type, pixels,
- &clippedPacking);
- break;
- case GL_DEPTH_STENCIL_EXT:
- read_depth_stencil_pixels(ctx, x, y, width, height, type, pixels,
- &clippedPacking);
- break;
- default:
- /* all other formats should be color formats */
- read_rgba_pixels(ctx, x, y, width, height, format, type, pixels,
- &clippedPacking);
- }
-
- _mesa_unmap_pbo_dest(ctx, &clippedPacking);
- }
- }
-}
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