| 0,0 → 1,508 |
|---|
| /* |
| * 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/bufferobj.h" |
| #include "main/colormac.h" |
| #include "main/feedback.h" |
| #include "main/formats.h" |
| #include "main/image.h" |
| #include "main/imports.h" |
| #include "main/macros.h" |
| #include "main/pack.h" |
| #include "main/state.h" |
| |
| #include "s_context.h" |
| #include "s_depth.h" |
| #include "s_span.h" |
| #include "s_stencil.h" |
| |
| |
| /** |
| * 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->_DepthBuffer; |
| const GLboolean biasOrScale |
| = ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0; |
| |
| 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 (type == GL_UNSIGNED_SHORT && fb->Visual.depthBits == 16 |
| && !biasOrScale && !packing->SwapBytes) { |
| /* Special case: directly read 16-bit unsigned depth values. */ |
| GLint j; |
| ASSERT(rb->Format == MESA_FORMAT_Z16); |
| ASSERT(rb->DataType == GL_UNSIGNED_SHORT); |
| for (j = 0; j < height; j++, y++) { |
| void *dest =_mesa_image_address2d(packing, pixels, width, height, |
| GL_DEPTH_COMPONENT, type, j, 0); |
| rb->GetRow(ctx, rb, width, x, y, dest); |
| } |
| } |
| else if (type == GL_UNSIGNED_INT && fb->Visual.depthBits == 24 |
| && !biasOrScale && !packing->SwapBytes) { |
| /* Special case: directly read 24-bit unsigned depth values. */ |
| GLint j; |
| ASSERT(rb->Format == MESA_FORMAT_X8_Z24 || |
| rb->Format == MESA_FORMAT_S8_Z24 || |
| rb->Format == MESA_FORMAT_Z24_X8 || |
| rb->Format == MESA_FORMAT_Z24_S8); |
| ASSERT(rb->DataType == GL_UNSIGNED_INT || |
| rb->DataType == GL_UNSIGNED_INT_24_8); |
| for (j = 0; j < height; j++, y++) { |
| GLuint *dest = (GLuint *) |
| _mesa_image_address2d(packing, pixels, width, height, |
| GL_DEPTH_COMPONENT, type, j, 0); |
| GLint k; |
| rb->GetRow(ctx, rb, width, x, y, dest); |
| /* convert range from 24-bit to 32-bit */ |
| if (rb->Format == MESA_FORMAT_X8_Z24 || |
| rb->Format == MESA_FORMAT_S8_Z24) { |
| for (k = 0; k < width; k++) { |
| /* Note: put MSByte of 24-bit value into LSByte */ |
| dest[k] = (dest[k] << 8) | ((dest[k] >> 16) & 0xff); |
| } |
| } |
| else { |
| for (k = 0; k < width; k++) { |
| /* Note: fill in LSByte by replication */ |
| dest[k] = dest[k] | ((dest[k] >> 8) & 0xff); |
| } |
| } |
| } |
| } |
| else if (type == GL_UNSIGNED_INT && fb->Visual.depthBits == 32 |
| && !biasOrScale && !packing->SwapBytes) { |
| /* Special case: directly read 32-bit unsigned depth values. */ |
| GLint j; |
| ASSERT(rb->Format == MESA_FORMAT_Z32); |
| ASSERT(rb->DataType == GL_UNSIGNED_INT); |
| for (j = 0; j < height; j++, y++) { |
| void *dest = _mesa_image_address2d(packing, pixels, width, height, |
| GL_DEPTH_COMPONENT, type, j, 0); |
| rb->GetRow(ctx, rb, width, x, y, dest); |
| } |
| } |
| else { |
| /* General case (slower) */ |
| GLint j; |
| for (j = 0; j < height; j++, y++) { |
| GLfloat depthValues[MAX_WIDTH]; |
| GLvoid *dest = _mesa_image_address2d(packing, pixels, width, height, |
| GL_DEPTH_COMPONENT, type, j, 0); |
| _swrast_read_depth_span_float(ctx, rb, width, x, y, depthValues); |
| _mesa_pack_depth_span(ctx, width, dest, type, depthValues, packing); |
| } |
| } |
| } |
| |
| |
| /** |
| * 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->_StencilBuffer; |
| GLint j; |
| |
| if (!rb) |
| return; |
| |
| /* 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 stencil[MAX_WIDTH]; |
| |
| _swrast_read_stencil_span(ctx, rb, width, x, y, 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); |
| } |
| } |
| |
| |
| |
| /** |
| * 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_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; |
| } |
| |
| |
| /** |
| * When we're using a low-precision color buffer (like 16-bit 5/6/5) |
| * we have to adjust our color values a bit to pass conformance. |
| * The problem is when a 5 or 6-bit color value is converted to an 8-bit |
| * value and then a floating point value, the floating point values don't |
| * increment uniformly as the 5 or 6-bit value is incremented. |
| * |
| * This function adjusts floating point values to compensate. |
| */ |
| static void |
| adjust_colors(const struct gl_framebuffer *fb, GLuint n, GLfloat rgba[][4]) |
| { |
| const GLuint rShift = 8 - fb->Visual.redBits; |
| const GLuint gShift = 8 - fb->Visual.greenBits; |
| const GLuint bShift = 8 - fb->Visual.blueBits; |
| GLfloat rScale = 1.0F / (GLfloat) ((1 << fb->Visual.redBits ) - 1); |
| GLfloat gScale = 1.0F / (GLfloat) ((1 << fb->Visual.greenBits) - 1); |
| GLfloat bScale = 1.0F / (GLfloat) ((1 << fb->Visual.blueBits ) - 1); |
| GLuint i; |
| |
| if (fb->Visual.redBits == 0) |
| rScale = 0; |
| if (fb->Visual.greenBits == 0) |
| gScale = 0; |
| if (fb->Visual.blueBits == 0) |
| bScale = 0; |
| |
| for (i = 0; i < n; i++) { |
| GLint r, g, b; |
| /* convert float back to ubyte */ |
| CLAMPED_FLOAT_TO_UBYTE(r, rgba[i][RCOMP]); |
| CLAMPED_FLOAT_TO_UBYTE(g, rgba[i][GCOMP]); |
| CLAMPED_FLOAT_TO_UBYTE(b, rgba[i][BCOMP]); |
| /* using only the N most significant bits of the ubyte value, convert to |
| * float in [0,1]. |
| */ |
| rgba[i][RCOMP] = (GLfloat) (r >> rShift) * rScale; |
| rgba[i][GCOMP] = (GLfloat) (g >> gShift) * gScale; |
| rgba[i][BCOMP] = (GLfloat) (b >> bShift) * bScale; |
| } |
| } |
| |
| |
| |
| /* |
| * 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 ) |
| { |
| SWcontext *swrast = SWRAST_CONTEXT(ctx); |
| GLbitfield transferOps = ctx->_ImageTransferState; |
| struct gl_framebuffer *fb = ctx->ReadBuffer; |
| struct gl_renderbuffer *rb = fb->_ColorReadBuffer; |
| |
| if (!rb) |
| return; |
| |
| if (type == GL_FLOAT && ((ctx->Color.ClampReadColor == GL_TRUE) || |
| (ctx->Color.ClampReadColor == GL_FIXED_ONLY_ARB && |
| rb->DataType != GL_FLOAT))) |
| transferOps |= IMAGE_CLAMP_BIT; |
| |
| /* Try optimized path first */ |
| if (fast_read_rgba_pixels(ctx, x, y, width, height, |
| format, type, pixels, packing, transferOps)) { |
| return; /* done! */ |
| } |
| |
| /* width should never be > MAX_WIDTH since we did clipping earlier */ |
| ASSERT(width <= MAX_WIDTH); |
| |
| do { |
| const GLint dstStride |
| = _mesa_image_row_stride(packing, width, format, type); |
| GLfloat (*rgba)[4] = swrast->SpanArrays->attribs[FRAG_ATTRIB_COL0]; |
| GLint row; |
| GLubyte *dst |
| = (GLubyte *) _mesa_image_address2d(packing, pixels, width, height, |
| format, type, 0, 0); |
| |
| for (row = 0; row < height; row++, y++) { |
| |
| /* Get float rgba pixels */ |
| _swrast_read_rgba_span(ctx, rb, width, x, y, GL_FLOAT, rgba); |
| |
| /* apply fudge factor for shallow color buffers */ |
| if (fb->Visual.redBits < 8 || |
| fb->Visual.greenBits < 8 || |
| fb->Visual.blueBits < 8) { |
| adjust_colors(fb, width, rgba); |
| } |
| |
| /* pack the row of RGBA pixels into user's buffer */ |
| _mesa_pack_rgba_span_float(ctx, width, rgba, format, type, dst, |
| packing, transferOps); |
| |
| dst += dstStride; |
| } |
| } while (0); |
| } |
| |
| |
| /** |
| * 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; |
| struct gl_renderbuffer *depthRb, *stencilRb; |
| |
| depthRb = ctx->ReadBuffer->_DepthBuffer; |
| stencilRb = ctx->ReadBuffer->_StencilBuffer; |
| |
| if (!depthRb || !stencilRb) |
| return; |
| |
| depthRb = ctx->ReadBuffer->Attachment[BUFFER_DEPTH].Renderbuffer; |
| stencilRb = ctx->ReadBuffer->Attachment[BUFFER_STENCIL].Renderbuffer; |
| |
| if (depthRb->_BaseFormat == GL_DEPTH_STENCIL_EXT && |
| stencilRb->_BaseFormat == GL_DEPTH_STENCIL_EXT && |
| depthRb == stencilRb && |
| !scaleOrBias && |
| !stencilTransfer) { |
| /* This is the ideal case. |
| * Reading GL_DEPTH_STENCIL pixels from combined depth/stencil buffer. |
| * Plus, no pixel transfer ops to worry about! |
| */ |
| GLint i; |
| GLint dstStride = _mesa_image_row_stride(packing, width, |
| GL_DEPTH_STENCIL_EXT, type); |
| GLubyte *dst = (GLubyte *) _mesa_image_address2d(packing, pixels, |
| width, height, |
| GL_DEPTH_STENCIL_EXT, |
| type, 0, 0); |
| for (i = 0; i < height; i++) { |
| depthRb->GetRow(ctx, depthRb, width, x, y + i, dst); |
| dst += dstStride; |
| } |
| } |
| else { |
| /* Reading GL_DEPTH_STENCIL pixels from separate depth/stencil buffers, |
| * or we need pixel transfer. |
| */ |
| GLint i; |
| depthRb = ctx->ReadBuffer->_DepthBuffer; |
| stencilRb = ctx->ReadBuffer->_StencilBuffer; |
| |
| for (i = 0; i < height; i++) { |
| GLstencil stencilVals[MAX_WIDTH]; |
| |
| GLuint *depthStencilDst = (GLuint *) |
| _mesa_image_address2d(packing, pixels, width, height, |
| GL_DEPTH_STENCIL_EXT, type, i, 0); |
| |
| _swrast_read_stencil_span(ctx, stencilRb, width, |
| x, y + i, stencilVals); |
| |
| if (!scaleOrBias && !stencilTransfer |
| && ctx->ReadBuffer->Visual.depthBits == 24) { |
| /* ideal case */ |
| GLuint zVals[MAX_WIDTH]; /* 24-bit values! */ |
| GLint j; |
| ASSERT(depthRb->DataType == GL_UNSIGNED_INT); |
| /* note, we've already been clipped */ |
| depthRb->GetRow(ctx, depthRb, width, x, y + i, zVals); |
| for (j = 0; j < width; j++) { |
| depthStencilDst[j] = (zVals[j] << 8) | (stencilVals[j] & 0xff); |
| } |
| } |
| else { |
| /* general case */ |
| GLfloat depthVals[MAX_WIDTH]; |
| _swrast_read_depth_span_float(ctx, depthRb, width, x, y + i, |
| depthVals); |
| _mesa_pack_depth_stencil_span(ctx, width, depthStencilDst, |
| depthVals, stencilVals, packing); |
| } |
| } |
| } |
| } |
| |
| |
| |
| /** |
| * 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 ) |
| { |
| SWcontext *swrast = SWRAST_CONTEXT(ctx); |
| 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); |
| |
| if (swrast->NewState) |
| _swrast_validate_derived( 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); |
| } |