/* * Mesa 3-D graphics library * * 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 * THE AUTHORS OR COPYRIGHT HOLDERS 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 "blend.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" /** * Return true if the conversion L=R+G+B is needed. */ static GLboolean need_rgb_to_luminance_conversion(gl_format texFormat, GLenum format) { GLenum baseTexFormat = _mesa_get_format_base_format(texFormat); return (baseTexFormat == GL_RG || baseTexFormat == GL_RGB || baseTexFormat == GL_RGBA) && (format == GL_LUMINANCE || format == GL_LUMINANCE_ALPHA); } /** * Return transfer op flags for this ReadPixels operation. */ static GLbitfield get_readpixels_transfer_ops(const struct gl_context *ctx, gl_format texFormat, GLenum format, GLenum type, GLboolean uses_blit) { GLbitfield transferOps = ctx->_ImageTransferState; if (format == GL_DEPTH_COMPONENT || format == GL_DEPTH_STENCIL || format == GL_STENCIL_INDEX) { return 0; } /* Pixel transfer ops (scale, bias, table lookup) do not apply * to integer formats. */ if (_mesa_is_enum_format_integer(format)) { return 0; } if (uses_blit) { /* For blit-based ReadPixels packing, the clamping is done automatically * unless the type is float. */ if (_mesa_get_clamp_read_color(ctx) && (type == GL_FLOAT || type == GL_HALF_FLOAT)) { transferOps |= IMAGE_CLAMP_BIT; } } else { /* For CPU-based ReadPixels packing, the clamping must always be done * for non-float types, */ if (_mesa_get_clamp_read_color(ctx) || (type != GL_FLOAT && type != GL_HALF_FLOAT)) { transferOps |= IMAGE_CLAMP_BIT; } } /* If the format is unsigned normalized, 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(texFormat) == GL_UNSIGNED_NORMALIZED && !need_rgb_to_luminance_conversion(texFormat, format)) { transferOps &= ~IMAGE_CLAMP_BIT; } return transferOps; } /** * Return true if memcpy cannot be used for ReadPixels. * * If uses_blit is true, the function returns true if a simple 3D engine blit * cannot be used for ReadPixels packing. * * NOTE: This doesn't take swizzling and format conversions between * the readbuffer and the pixel pack buffer into account. */ GLboolean _mesa_readpixels_needs_slow_path(const struct gl_context *ctx, GLenum format, GLenum type, GLboolean uses_blit) { struct gl_renderbuffer *rb = _mesa_get_read_renderbuffer_for_format(ctx, format); GLenum srcType; ASSERT(rb); /* There are different rules depending on the base format. */ switch (format) { case GL_DEPTH_STENCIL: return !_mesa_has_depthstencil_combined(ctx->ReadBuffer) || ctx->Pixel.DepthScale != 1.0f || ctx->Pixel.DepthBias != 0.0f || ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset || ctx->Pixel.MapStencilFlag; case GL_DEPTH_COMPONENT: return ctx->Pixel.DepthScale != 1.0f || ctx->Pixel.DepthBias != 0.0f; case GL_STENCIL_INDEX: return ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset || ctx->Pixel.MapStencilFlag; default: /* Color formats. */ if (need_rgb_to_luminance_conversion(rb->Format, format)) { return GL_TRUE; } /* Conversion between signed and unsigned integers needs masking * (it isn't just memcpy). */ 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 GL_TRUE; } /* And finally, see if there are any transfer ops. */ return get_readpixels_transfer_ops(ctx, rb->Format, format, type, uses_blit) != 0; } return GL_FALSE; } static GLboolean readpixels_can_use_memcpy(const struct gl_context *ctx, GLenum format, GLenum type, const struct gl_pixelstore_attrib *packing) { struct gl_renderbuffer *rb = _mesa_get_read_renderbuffer_for_format(ctx, format); ASSERT(rb); if (_mesa_readpixels_needs_slow_path(ctx, format, type, GL_FALSE)) { return GL_FALSE; } /* The base internal format and the base Mesa format must match. */ if (rb->_BaseFormat != _mesa_get_format_base_format(rb->Format)) { return GL_FALSE; } /* The Mesa format must match the input format and type. */ if (!_mesa_format_matches_format_and_type(rb->Format, format, type, packing->SwapBytes)) { return GL_FALSE; } return GL_TRUE; } static GLboolean readpixels_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) { struct gl_renderbuffer *rb = _mesa_get_read_renderbuffer_for_format(ctx, format); GLubyte *dst, *map; int dstStride, stride, j, texelBytes; /* Fail if memcpy cannot be used. */ if (!readpixels_can_use_memcpy(ctx, format, type, packing)) { 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); /* memcpy*/ for (j = 0; j < height; j++) { memcpy(dst, map, width * texelBytes); dst += dstStride; map += stride; } ctx->Driver.UnmapRenderbuffer(ctx, rb); return GL_TRUE; } /** * Optimized path for conversion of depth values to GL_DEPTH_COMPONENT, * GL_UNSIGNED_INT. */ static GLboolean read_uint_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; 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++) { _mesa_unpack_uint_z_row(rb->Format, width, map, (GLuint *)dst); 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 (type == GL_UNSIGNED_INT && read_uint_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 = 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 = 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 swizzle. * \return GL_TRUE if successful, GL_FALSE otherwise (use the slow path) */ static GLboolean read_rgba_pixels_swizzle(struct gl_context *ctx, GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, GLvoid *pixels, const struct gl_pixelstore_attrib *packing) { struct gl_renderbuffer *rb = ctx->ReadBuffer->_ColorReadBuffer; GLubyte *dst, *map; int dstStride, stride, j; 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 { 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 */ } 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; } } 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; struct gl_framebuffer *fb = ctx->ReadBuffer; struct gl_renderbuffer *rb = fb->_ColorReadBuffer; if (!rb) return; transferOps = get_readpixels_transfer_ops(ctx, rb->Format, format, type, GL_FALSE); /* Try the optimized paths first. */ if (!transferOps && read_rgba_pixels_swizzle(ctx, x, y, width, height, format, type, pixels, packing)) { 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 = 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 = malloc(width * sizeof(GLubyte)); depthVals = 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) { /* Try memcpy first. */ if (readpixels_memcpy(ctx, x, y, width, height, format, type, pixels, packing)) { _mesa_unmap_pbo_dest(ctx, &clippedPacking); return; } /* Otherwise take the slow path. */ 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); } } } static GLenum read_pixels_es3_error_check(GLenum format, GLenum type, const struct gl_renderbuffer *rb) { const GLenum internalFormat = rb->InternalFormat; const GLenum data_type = _mesa_get_format_datatype(rb->Format); GLboolean is_unsigned_int = GL_FALSE; GLboolean is_signed_int = GL_FALSE; if (!_mesa_is_color_format(internalFormat)) { return GL_INVALID_OPERATION; } is_unsigned_int = _mesa_is_enum_format_unsigned_int(internalFormat); if (!is_unsigned_int) { is_signed_int = _mesa_is_enum_format_signed_int(internalFormat); } switch (format) { case GL_RGBA: if (type == GL_FLOAT && data_type == GL_FLOAT) return GL_NO_ERROR; /* EXT_color_buffer_float */ if (type == GL_UNSIGNED_BYTE && data_type == GL_UNSIGNED_NORMALIZED) return GL_NO_ERROR; if (internalFormat == GL_RGB10_A2 && type == GL_UNSIGNED_INT_2_10_10_10_REV) return GL_NO_ERROR; if (internalFormat == GL_RGB10_A2UI && type == GL_UNSIGNED_BYTE) return GL_NO_ERROR; break; case GL_BGRA: /* GL_EXT_read_format_bgra */ if (type == GL_UNSIGNED_BYTE || type == GL_UNSIGNED_SHORT_4_4_4_4_REV || type == GL_UNSIGNED_SHORT_1_5_5_5_REV) return GL_NO_ERROR; break; case GL_RGBA_INTEGER: if ((is_signed_int && type == GL_INT) || (is_unsigned_int && type == GL_UNSIGNED_INT)) return GL_NO_ERROR; break; } return GL_INVALID_OPERATION; } void GLAPIENTRY _mesa_ReadnPixelsARB( GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, GLsizei bufSize, GLvoid *pixels ) { GLenum err = GL_NO_ERROR; struct gl_renderbuffer *rb; GET_CURRENT_CONTEXT(ctx); FLUSH_VERTICES(ctx, 0); 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; } if (ctx->NewState) _mesa_update_state(ctx); if (ctx->ReadBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) { _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT, "glReadPixels(incomplete framebuffer)" ); return; } rb = _mesa_get_read_renderbuffer_for_format(ctx, format); if (rb == NULL) { _mesa_error(ctx, GL_INVALID_OPERATION, "glReadPixels(read buffer)"); 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)) { if (ctx->API == API_OPENGLES2 && _mesa_is_color_format(format) && _mesa_get_color_read_format(ctx) == format && _mesa_get_color_read_type(ctx) == type) { err = GL_NO_ERROR; } else if (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 { err = read_pixels_es3_error_check(format, type, rb); } if (err == GL_NO_ERROR && (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; } } 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 (_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); }