| /* |
| * Mesa 3-D graphics library |
| * Version: 7.1 |
| * |
| * Copyright (C) 1999-2008 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 "glheader.h" |
| #include "imports.h" |
| #include "bufferobj.h" |
| #include "context.h" |
| #include "enums.h" |
| #include "readpix.h" |
| #include "framebuffer.h" |
| #include "formats.h" |
| #include "format_unpack.h" |
| #include "image.h" |
| #include "mtypes.h" |
| #include "pack.h" |
| #include "pbo.h" |
| #include "state.h" |
| #include "glformats.h" |
| #include "fbobject.h" |
| #include "teximage.h" |
| |
| /* Inexplicably, GL_HALF_FLOAT_OES has a different value than GL_HALF_FLOAT. |
| */ |
| #ifndef GL_HALF_FLOAT_OES |
| #define GL_HALF_FLOAT_OES 0x8D61 |
| #endif |
| |
| /** |
| * 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_NORMALIZED) |
| 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); |
| |
| if (!map) { |
| _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels"); |
| return GL_TRUE; /* don't bother trying the slow path */ |
| } |
| |
| 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; |
| GLfloat *depthValues; |
| |
| 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); |
| |
| 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); |
| if (!map) { |
| _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels"); |
| return; |
| } |
| |
| depthValues = (GLfloat *) malloc(width * sizeof(GLfloat)); |
| |
| if (depthValues) { |
| /* General case (slower) */ |
| for (j = 0; j < height; j++, y++) { |
| _mesa_unpack_float_z_row(rb->Format, width, map, depthValues); |
| _mesa_pack_depth_span(ctx, width, dst, type, depthValues, packing); |
| |
| dst += dstStride; |
| map += stride; |
| } |
| } |
| else { |
| _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels"); |
| } |
| |
| free(depthValues); |
| |
| 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, *stencil; |
| GLint stride; |
| |
| if (!rb) |
| return; |
| |
| ctx->Driver.MapRenderbuffer(ctx, rb, x, y, width, height, GL_MAP_READ_BIT, |
| &map, &stride); |
| if (!map) { |
| _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels"); |
| return; |
| } |
| |
| stencil = (GLubyte *) malloc(width * sizeof(GLubyte)); |
| |
| if (stencil) { |
| /* process image row by row */ |
| for (j = 0; j < height; j++) { |
| GLvoid *dest; |
| |
| _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; |
| } |
| } |
| else { |
| _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels"); |
| } |
| |
| free(stencil); |
| |
| ctx->Driver.UnmapRenderbuffer(ctx, rb); |
| } |
| |
| |
| /** |
| * Try to do glReadPixels of RGBA data using a simple memcpy or swizzle. |
| * \return GL_TRUE if successful, GL_FALSE otherwise (use the slow path) |
| */ |
| 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; |
| GLboolean swizzle_rb = GL_FALSE, copy_xrgb = GL_FALSE; |
| |
| /* XXX we could check for other swizzle/special cases here as needed */ |
| if (rb->Format == MESA_FORMAT_RGBA8888_REV && |
| format == GL_BGRA && |
| type == GL_UNSIGNED_INT_8_8_8_8_REV && |
| !ctx->Pack.SwapBytes) { |
| swizzle_rb = GL_TRUE; |
| } |
| else if (rb->Format == MESA_FORMAT_XRGB8888 && |
| format == GL_BGRA && |
| type == GL_UNSIGNED_INT_8_8_8_8_REV && |
| !ctx->Pack.SwapBytes) { |
| copy_xrgb = GL_TRUE; |
| } |
| else if (!_mesa_format_matches_format_and_type(rb->Format, format, type, |
| ctx->Pack.SwapBytes)) |
| return GL_FALSE; |
| |
| /* If the format is unsigned normalized then we can ignore clamping |
| * because the values are already in the range [0,1] so it won't |
| * have any effect anyway. |
| */ |
| if (_mesa_get_format_datatype(rb->Format) == GL_UNSIGNED_NORMALIZED) |
| transferOps &= ~IMAGE_CLAMP_BIT; |
| |
| if (transferOps) |
| 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); |
| if (!map) { |
| _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels"); |
| return GL_TRUE; /* don't bother trying the slow path */ |
| } |
| |
| texelBytes = _mesa_get_format_bytes(rb->Format); |
| |
| if (swizzle_rb) { |
| /* swap R/B */ |
| for (j = 0; j < height; j++) { |
| int i; |
| for (i = 0; i < width; i++) { |
| GLuint *dst4 = (GLuint *) dst, *map4 = (GLuint *) map; |
| GLuint pixel = map4[i]; |
| dst4[i] = (pixel & 0xff00ff00) |
| | ((pixel & 0x00ff0000) >> 16) |
| | ((pixel & 0x000000ff) << 16); |
| } |
| dst += dstStride; |
| map += stride; |
| } |
| } else if (copy_xrgb) { |
| /* convert xrgb -> argb */ |
| for (j = 0; j < height; j++) { |
| GLuint *dst4 = (GLuint *) dst, *map4 = (GLuint *) map; |
| int i; |
| for (i = 0; i < width; i++) { |
| dst4[i] = map4[i] | 0xff000000; /* set A=0xff */ |
| } |
| dst += dstStride; |
| map += stride; |
| } |
| } else { |
| /* just memcpy */ |
| for (j = 0; j < height; j++) { |
| memcpy(dst, map, width * texelBytes); |
| dst += dstStride; |
| map += stride; |
| } |
| } |
| |
| ctx->Driver.UnmapRenderbuffer(ctx, rb); |
| |
| return GL_TRUE; |
| } |
| |
| static void |
| 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); |
| void *rgba; |
| GLubyte *dst, *map; |
| int dstStride, stride, j; |
| GLboolean dst_is_integer = _mesa_is_enum_format_integer(format); |
| GLboolean dst_is_uint = _mesa_is_format_unsigned(rbFormat); |
| |
| 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); |
| if (!map) { |
| _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels"); |
| return; |
| } |
| |
| rgba = malloc(width * MAX_PIXEL_BYTES); |
| if (!rgba) |
| goto done; |
| |
| for (j = 0; j < height; j++) { |
| if (dst_is_integer) { |
| _mesa_unpack_uint_rgba_row(rbFormat, width, map, (GLuint (*)[4]) rgba); |
| _mesa_rebase_rgba_uint(width, (GLuint (*)[4]) rgba, |
| rb->_BaseFormat); |
| if (dst_is_uint) { |
| _mesa_pack_rgba_span_from_uints(ctx, width, (GLuint (*)[4]) rgba, format, |
| type, dst); |
| } else { |
| _mesa_pack_rgba_span_from_ints(ctx, width, (GLint (*)[4]) rgba, format, |
| type, dst); |
| } |
| } else { |
| _mesa_unpack_rgba_row(rbFormat, width, map, (GLfloat (*)[4]) rgba); |
| _mesa_rebase_rgba_float(width, (GLfloat (*)[4]) rgba, |
| rb->_BaseFormat); |
| _mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) rgba, format, |
| type, dst, packing, transferOps); |
| } |
| dst += dstStride; |
| map += stride; |
| } |
| |
| free(rgba); |
| |
| done: |
| ctx->Driver.UnmapRenderbuffer(ctx, rb); |
| } |
| |
| /* |
| * 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_enum_format_integer(format)) { |
| transferOps |= IMAGE_CLAMP_BIT; |
| } |
| |
| /* 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); |
| if (!map) { |
| _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels"); |
| return GL_TRUE; /* don't bother trying the slow path */ |
| } |
| |
| 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, *stencilVals; |
| int depthStride, stencilStride, i, j; |
| |
| if (_mesa_get_format_datatype(depthRb->Format) != GL_UNSIGNED_NORMALIZED) |
| return GL_FALSE; |
| |
| ctx->Driver.MapRenderbuffer(ctx, depthRb, x, y, width, height, |
| GL_MAP_READ_BIT, &depthMap, &depthStride); |
| if (!depthMap) { |
| _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels"); |
| return GL_TRUE; /* don't bother trying the slow path */ |
| } |
| |
| ctx->Driver.MapRenderbuffer(ctx, stencilRb, x, y, width, height, |
| GL_MAP_READ_BIT, &stencilMap, &stencilStride); |
| if (!stencilMap) { |
| ctx->Driver.UnmapRenderbuffer(ctx, depthRb); |
| _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels"); |
| return GL_TRUE; /* don't bother trying the slow path */ |
| } |
| |
| stencilVals = (GLubyte *) malloc(width * sizeof(GLubyte)); |
| |
| if (stencilVals) { |
| for (j = 0; j < height; j++) { |
| _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; |
| } |
| } |
| else { |
| _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels"); |
| } |
| |
| free(stencilVals); |
| |
| 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; |
| GLubyte *stencilVals; |
| GLfloat *depthVals; |
| |
| |
| /* The depth and stencil buffers might be separate, or a single buffer. |
| * If one buffer, only map it once. |
| */ |
| ctx->Driver.MapRenderbuffer(ctx, depthRb, x, y, width, height, |
| GL_MAP_READ_BIT, &depthMap, &depthStride); |
| if (!depthMap) { |
| _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels"); |
| return; |
| } |
| |
| if (stencilRb != depthRb) { |
| ctx->Driver.MapRenderbuffer(ctx, stencilRb, x, y, width, height, |
| GL_MAP_READ_BIT, &stencilMap, |
| &stencilStride); |
| if (!stencilMap) { |
| ctx->Driver.UnmapRenderbuffer(ctx, depthRb); |
| _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels"); |
| return; |
| } |
| } |
| else { |
| stencilMap = depthMap; |
| stencilStride = depthStride; |
| } |
| |
| stencilVals = (GLubyte *) malloc(width * sizeof(GLubyte)); |
| depthVals = (GLfloat *) malloc(width * sizeof(GLfloat)); |
| |
| if (stencilVals && depthVals) { |
| for (j = 0; j < height; j++) { |
| _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; |
| } |
| } |
| else { |
| _mesa_error(ctx, GL_OUT_OF_MEMORY, "glReadPixels"); |
| } |
| |
| free(stencilVals); |
| free(depthVals); |
| |
| ctx->Driver.UnmapRenderbuffer(ctx, depthRb); |
| if (stencilRb != 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 |
| _mesa_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); |
| } |
| } |
| } |
| |
| |
| void GLAPIENTRY |
| _mesa_ReadnPixelsARB( GLint x, GLint y, GLsizei width, GLsizei height, |
| GLenum format, GLenum type, GLsizei bufSize, |
| GLvoid *pixels ) |
| { |
| GLenum err; |
| |
| GET_CURRENT_CONTEXT(ctx); |
| ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); |
| |
| FLUSH_CURRENT(ctx, 0); |
| |
| if (MESA_VERBOSE & VERBOSE_API) |
| _mesa_debug(ctx, "glReadPixels(%d, %d, %s, %s, %p)\n", |
| width, height, |
| _mesa_lookup_enum_by_nr(format), |
| _mesa_lookup_enum_by_nr(type), |
| pixels); |
| |
| if (width < 0 || height < 0) { |
| _mesa_error( ctx, GL_INVALID_VALUE, |
| "glReadPixels(width=%d height=%d)", width, height ); |
| return; |
| } |
| |
| /* OpenGL ES 1.x and OpenGL ES 2.0 impose additional restrictions on the |
| * combinations of format and type that can be used. |
| * |
| * Technically, only two combinations are actually allowed: |
| * GL_RGBA/GL_UNSIGNED_BYTE, and some implementation-specific internal |
| * preferred combination. This code doesn't know what that preferred |
| * combination is, and Mesa can handle anything valid. Just work instead. |
| */ |
| if (_mesa_is_gles(ctx) && ctx->Version < 30) { |
| err = _mesa_es_error_check_format_and_type(format, type, 2); |
| if (err == GL_NO_ERROR) { |
| if (type == GL_FLOAT || type == GL_HALF_FLOAT_OES) { |
| err = GL_INVALID_OPERATION; |
| } else if (format == GL_DEPTH_COMPONENT |
| || format == GL_DEPTH_STENCIL) { |
| err = GL_INVALID_ENUM; |
| } |
| } |
| |
| if (err != GL_NO_ERROR) { |
| _mesa_error(ctx, err, "glReadPixels(invalid format %s and/or type %s)", |
| _mesa_lookup_enum_by_nr(format), |
| _mesa_lookup_enum_by_nr(type)); |
| return; |
| } |
| } |
| |
| if (ctx->NewState) |
| _mesa_update_state(ctx); |
| |
| err = _mesa_error_check_format_and_type(ctx, format, type); |
| if (err != GL_NO_ERROR) { |
| _mesa_error(ctx, err, "glReadPixels(invalid format %s and/or type %s)", |
| _mesa_lookup_enum_by_nr(format), |
| _mesa_lookup_enum_by_nr(type)); |
| return; |
| } |
| |
| if (ctx->ReadBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) { |
| _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT, |
| "glReadPixels(incomplete framebuffer)" ); |
| return; |
| } |
| |
| if (_mesa_is_user_fbo(ctx->ReadBuffer) && |
| ctx->ReadBuffer->Visual.samples > 0) { |
| _mesa_error(ctx, GL_INVALID_OPERATION, "glReadPixels(multisample FBO)"); |
| return; |
| } |
| |
| if (!_mesa_source_buffer_exists(ctx, format)) { |
| _mesa_error(ctx, GL_INVALID_OPERATION, "glReadPixels(no readbuffer)"); |
| return; |
| } |
| |
| /* Check that the destination format and source buffer are both |
| * integer-valued or both non-integer-valued. |
| */ |
| if (ctx->Extensions.EXT_texture_integer && _mesa_is_color_format(format)) { |
| const struct gl_renderbuffer *rb = ctx->ReadBuffer->_ColorReadBuffer; |
| const GLboolean srcInteger = _mesa_is_format_integer_color(rb->Format); |
| const GLboolean dstInteger = _mesa_is_enum_format_integer(format); |
| if (dstInteger != srcInteger) { |
| _mesa_error(ctx, GL_INVALID_OPERATION, |
| "glReadPixels(integer / non-integer format mismatch"); |
| return; |
| } |
| } |
| |
| if (width == 0 || height == 0) |
| return; /* nothing to do */ |
| |
| if (!_mesa_validate_pbo_access(2, &ctx->Pack, width, height, 1, |
| format, type, bufSize, pixels)) { |
| if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) { |
| _mesa_error(ctx, GL_INVALID_OPERATION, |
| "glReadPixels(out of bounds PBO access)"); |
| } else { |
| _mesa_error(ctx, GL_INVALID_OPERATION, |
| "glReadnPixelsARB(out of bounds access:" |
| " bufSize (%d) is too small)", bufSize); |
| } |
| return; |
| } |
| |
| if (_mesa_is_bufferobj(ctx->Pack.BufferObj) && |
| _mesa_bufferobj_mapped(ctx->Pack.BufferObj)) { |
| /* buffer is mapped - that's an error */ |
| _mesa_error(ctx, GL_INVALID_OPERATION, "glReadPixels(PBO is mapped)"); |
| return; |
| } |
| |
| ctx->Driver.ReadPixels(ctx, x, y, width, height, |
| format, type, &ctx->Pack, pixels); |
| } |
| |
| void GLAPIENTRY |
| _mesa_ReadPixels( GLint x, GLint y, GLsizei width, GLsizei height, |
| GLenum format, GLenum type, GLvoid *pixels ) |
| { |
| _mesa_ReadnPixelsARB(x, y, width, height, format, type, INT_MAX, pixels); |
| } |
