/************************************************************************** * * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas. * 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, sub license, 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 (including the * next paragraph) 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 NON-INFRINGEMENT. * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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. * **************************************************************************/ /** * glReadPixels interface to pipe * * \author Brian Paul */ #include "main/imports.h" #include "main/context.h" #include "main/image.h" #include "pipe/p_context.h" #include "pipe/p_defines.h" #include "st_context.h" #include "st_cb_readpixels.h" #include "st_cb_fbo.h" #include "st_format.h" #include "st_public.h" /** * Special case for reading stencil buffer. * For color/depth we use get_tile(). For stencil, map the stencil buffer. */ void st_read_stencil_pixels(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height, GLenum type, const struct gl_pixelstore_attrib *packing, GLvoid *pixels) { struct st_context *st = ctx->st; struct pipe_context *pipe = st->pipe; struct gl_framebuffer *fb = ctx->ReadBuffer; struct st_renderbuffer *strb = st_renderbuffer(fb->_StencilBuffer); struct pipe_surface *ps = strb->surface; ubyte *stmap; GLint j; /* map the stencil buffer */ stmap = pipe->region_map(pipe, ps->region); /* width should never be > MAX_WIDTH since we did clipping earlier */ ASSERT(width <= MAX_WIDTH); /* process image row by row */ for (j = 0; j < height; j++, y++) { GLvoid *dest; GLstencil values[MAX_WIDTH]; GLint srcY; if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) { srcY = ctx->DrawBuffer->Height - y - 1; } else { srcY = y; } /* get stencil values */ switch (ps->format) { case PIPE_FORMAT_U_S8: { const ubyte *src = stmap + srcY * ps->region->pitch + x; memcpy(values, src, width); } break; case PIPE_FORMAT_S8_Z24: { const uint *src = (uint *) stmap + srcY * ps->region->pitch + x; GLint k; for (k = 0; k < width; k++) { values[k] = src[k] >> 24; } } break; default: assert(0); } /* store */ dest = _mesa_image_address2d(packing, pixels, width, height, GL_STENCIL_INDEX, type, j, 0); _mesa_pack_stencil_span(ctx, width, type, dest, values, packing); } /* unmap the stencil buffer */ pipe->region_unmap(pipe, ps->region); } /** * Do glReadPixels by getting rows from the framebuffer surface with * get_tile(). Convert to requested format/type with Mesa image routines. * Image transfer ops are done in software too. */ static void st_readpixels(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, const struct gl_pixelstore_attrib *pack, GLvoid *dest) { struct pipe_context *pipe = ctx->st->pipe; GLfloat temp[MAX_WIDTH][4]; const GLbitfield transferOps = ctx->_ImageTransferState; GLint i, yStep, dfStride; GLfloat *df; struct st_renderbuffer *strb; struct gl_pixelstore_attrib clippedPacking = *pack; /* XXX convolution not done yet */ assert((transferOps & IMAGE_CONVOLUTION_BIT) == 0); /* Do all needed clipping here, so that we can forget about it later */ if (!_mesa_clip_readpixels(ctx, &x, &y, &width, &height, &clippedPacking)) { /* The ReadPixels region is totally outside the window bounds */ return; } /* make sure rendering has completed */ pipe->flush(pipe, 0x0); if (pack->BufferObj && pack->BufferObj->Name) { /* reading into a PBO */ } else { /* reading into user memory/buffer */ } if (format == GL_STENCIL_INDEX) { st_read_stencil_pixels(ctx, x, y, width, height, type, pack, dest); return; } else if (format == GL_DEPTH_COMPONENT) { strb = st_renderbuffer(ctx->ReadBuffer->_DepthBuffer); } else { strb = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer); } if (!strb) return; pipe->region_map(pipe, strb->surface->region); if (format == GL_RGBA && type == GL_FLOAT) { /* write tile(row) directly into user's buffer */ df = (GLfloat *) _mesa_image_address2d(&clippedPacking, dest, width, height, format, type, 0, 0); dfStride = width * 4; } #if 0 else if (format == GL_DEPTH_COMPONENT && type == GL_FLOAT) { /* write tile(row) directly into user's buffer */ df = (GLfloat *) _mesa_image_address2d(&clippedPacking, dest, width, height, format, type, 0, 0); dfStride = width; } #endif else { /* write tile(row) into temp row buffer */ df = (GLfloat *) temp; dfStride = 0; } /* determine bottom-to-top vs. top-to-bottom order */ if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) { y = strb->Base.Height - 1 - y; yStep = -1; } else { yStep = 1; } /* Do a row at a time to flip image data vertically */ for (i = 0; i < height; i++) { pipe->get_tile_rgba(pipe, strb->surface, x, y, width, 1, df); y += yStep; df += dfStride; if (!dfStride) { /* convert GLfloat to user's format/type */ GLvoid *dst = _mesa_image_address2d(&clippedPacking, dest, width, height, format, type, i, 0); if (format == GL_DEPTH_COMPONENT) { _mesa_pack_depth_span(ctx, width, dst, type, (GLfloat *) temp, &clippedPacking); } else { _mesa_pack_rgba_span_float(ctx, width, temp, format, type, dst, &clippedPacking, transferOps); } } } pipe->region_unmap(pipe, strb->surface->region); } void st_init_readpixels_functions(struct dd_function_table *functions) { functions->ReadPixels = st_readpixels; }