/* * 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; GLstencil 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); } /** * Optimized glReadPixels for particular pixel formats when pixel * scaling, biasing, mapping, etc. are disabled. * \return GL_TRUE if success, GL_FALSE if unable to do the readpixels */ static GLboolean fast_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; if (!rb) return GL_FALSE; ASSERT(rb->_BaseFormat == GL_RGBA || rb->_BaseFormat == GL_RGB || rb->_BaseFormat == GL_RG || rb->_BaseFormat == GL_RED || rb->_BaseFormat == GL_LUMINANCE || rb->_BaseFormat == GL_INTENSITY || rb->_BaseFormat == GL_LUMINANCE_ALPHA || rb->_BaseFormat == GL_ALPHA); /* clipping should have already been done */ ASSERT(x + width <= (GLint) rb->Width); ASSERT(y + height <= (GLint) rb->Height); /* check for things we can't handle here */ if (transferOps || packing->SwapBytes || packing->LsbFirst) { return GL_FALSE; } if (format == GL_RGBA && rb->DataType == type) { const GLint dstStride = _mesa_image_row_stride(packing, width, format, type); GLubyte *dest = (GLubyte *) _mesa_image_address2d(packing, pixels, width, height, format, type, 0, 0); GLint row; ASSERT(rb->GetRow); for (row = 0; row < height; row++) { rb->GetRow(ctx, rb, width, x, y + row, dest); dest += dstStride; } return GL_TRUE; } if (format == GL_RGB && rb->DataType == GL_UNSIGNED_BYTE && type == GL_UNSIGNED_BYTE) { const GLint dstStride = _mesa_image_row_stride(packing, width, format, type); GLubyte *dest = (GLubyte *) _mesa_image_address2d(packing, pixels, width, height, format, type, 0, 0); GLint row; ASSERT(rb->GetRow); for (row = 0; row < height; row++) { GLubyte tempRow[MAX_WIDTH][4]; GLint col; rb->GetRow(ctx, rb, width, x, y + row, tempRow); /* convert RGBA to RGB */ for (col = 0; col < width; col++) { dest[col * 3 + 0] = tempRow[col][0]; dest[col * 3 + 1] = tempRow[col][1]; dest[col * 3 + 2] = tempRow[col][2]; } dest += dstStride; } return GL_TRUE; } /* not handled */ return GL_FALSE; } 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; GLfloat rgba[MAX_WIDTH][4]; 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++) { _mesa_unpack_rgba_row(_mesa_get_srgb_format_linear(rb->Format), width, map, rgba); _mesa_pack_rgba_span_float(ctx, width, rgba, 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; } if (fast_read_rgba_pixels(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, GLvoid *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++) { GLstencil 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++) { GLstencil 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); /* Need to do swrast_render_start() before clipping or anything else * since this is where a driver may grab the hw lock and get an updated * window size. */ swrast_render_start(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); } } swrast_render_finish(ctx); }