| 0,0 → 1,234 |
|---|
| /* |
| * 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 "readpix.h" |
| #include "framebuffer.h" |
| #include "formats.h" |
| #include "image.h" |
| #include "state.h" |
| |
| |
| /** |
| * Do error checking of the format/type parameters to glReadPixels and |
| * glDrawPixels. |
| * \param drawing if GL_TRUE do checking for DrawPixels, else do checking |
| * for ReadPixels. |
| * \return GL_TRUE if error detected, GL_FALSE if no errors |
| */ |
| GLboolean |
| _mesa_error_check_format_type(struct gl_context *ctx, GLenum format, GLenum type, |
| GLboolean drawing) |
| { |
| const char *readDraw = drawing ? "Draw" : "Read"; |
| const GLboolean reading = !drawing; |
| |
| /* state validation should have already been done */ |
| ASSERT(ctx->NewState == 0x0); |
| |
| if (ctx->Extensions.EXT_packed_depth_stencil |
| && type == GL_UNSIGNED_INT_24_8_EXT |
| && format != GL_DEPTH_STENCIL_EXT) { |
| _mesa_error(ctx, GL_INVALID_OPERATION, |
| "gl%sPixels(format is not GL_DEPTH_STENCIL_EXT)", readDraw); |
| return GL_TRUE; |
| } |
| |
| /* basic combinations test */ |
| if (!_mesa_is_legal_format_and_type(ctx, format, type)) { |
| _mesa_error(ctx, GL_INVALID_ENUM, |
| "gl%sPixels(format or type)", readDraw); |
| return GL_TRUE; |
| } |
| |
| /* additional checks */ |
| switch (format) { |
| case GL_RG: |
| case GL_RED: |
| case GL_GREEN: |
| case GL_BLUE: |
| case GL_ALPHA: |
| case GL_LUMINANCE: |
| case GL_LUMINANCE_ALPHA: |
| case GL_RGB: |
| case GL_BGR: |
| case GL_RGBA: |
| case GL_BGRA: |
| case GL_ABGR_EXT: |
| case GL_RED_INTEGER_EXT: |
| case GL_GREEN_INTEGER_EXT: |
| case GL_BLUE_INTEGER_EXT: |
| case GL_ALPHA_INTEGER_EXT: |
| case GL_RGB_INTEGER_EXT: |
| case GL_RGBA_INTEGER_EXT: |
| case GL_BGR_INTEGER_EXT: |
| case GL_BGRA_INTEGER_EXT: |
| case GL_LUMINANCE_INTEGER_EXT: |
| case GL_LUMINANCE_ALPHA_INTEGER_EXT: |
| if (!drawing) { |
| /* reading */ |
| if (!_mesa_source_buffer_exists(ctx, GL_COLOR)) { |
| _mesa_error(ctx, GL_INVALID_OPERATION, |
| "glReadPixels(no color buffer)"); |
| return GL_TRUE; |
| } |
| } |
| break; |
| case GL_COLOR_INDEX: |
| if (drawing) { |
| if (ctx->PixelMaps.ItoR.Size == 0 || |
| ctx->PixelMaps.ItoG.Size == 0 || |
| ctx->PixelMaps.ItoB.Size == 0) { |
| _mesa_error(ctx, GL_INVALID_OPERATION, |
| "glDrawPixels(drawing color index pixels into RGB buffer)"); |
| return GL_TRUE; |
| } |
| } |
| else { |
| /* reading */ |
| if (!_mesa_source_buffer_exists(ctx, GL_COLOR)) { |
| _mesa_error(ctx, GL_INVALID_OPERATION, |
| "glReadPixels(no color buffer)"); |
| return GL_TRUE; |
| } |
| /* We no longer support CI-mode color buffers so trying to read |
| * GL_COLOR_INDEX pixels is always an error. |
| */ |
| _mesa_error(ctx, GL_INVALID_OPERATION, |
| "glReadPixels(color buffer is RGB)"); |
| return GL_TRUE; |
| } |
| break; |
| case GL_STENCIL_INDEX: |
| if ((drawing && !_mesa_dest_buffer_exists(ctx, format)) || |
| (reading && !_mesa_source_buffer_exists(ctx, format))) { |
| _mesa_error(ctx, GL_INVALID_OPERATION, |
| "gl%sPixels(no stencil buffer)", readDraw); |
| return GL_TRUE; |
| } |
| break; |
| case GL_DEPTH_COMPONENT: |
| if ((drawing && !_mesa_dest_buffer_exists(ctx, format))) { |
| _mesa_error(ctx, GL_INVALID_OPERATION, |
| "gl%sPixels(no depth buffer)", readDraw); |
| return GL_TRUE; |
| } |
| break; |
| case GL_DEPTH_STENCIL_EXT: |
| if (!ctx->Extensions.EXT_packed_depth_stencil || |
| type != GL_UNSIGNED_INT_24_8_EXT) { |
| _mesa_error(ctx, GL_INVALID_ENUM, "gl%sPixels(type)", readDraw); |
| return GL_TRUE; |
| } |
| if ((drawing && !_mesa_dest_buffer_exists(ctx, format)) || |
| (reading && !_mesa_source_buffer_exists(ctx, format))) { |
| _mesa_error(ctx, GL_INVALID_OPERATION, |
| "gl%sPixels(no depth or stencil buffer)", readDraw); |
| return GL_TRUE; |
| } |
| break; |
| default: |
| /* this should have been caught in _mesa_is_legal_format_type() */ |
| _mesa_problem(ctx, "unexpected format in _mesa_%sPixels", readDraw); |
| return GL_TRUE; |
| } |
| |
| /* no errors */ |
| return GL_FALSE; |
| } |
| |
| |
| |
| void GLAPIENTRY |
| _mesa_ReadPixels( GLint x, GLint y, GLsizei width, GLsizei height, |
| GLenum format, GLenum type, GLvoid *pixels ) |
| { |
| GET_CURRENT_CONTEXT(ctx); |
| ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); |
| |
| FLUSH_CURRENT(ctx, 0); |
| |
| 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 (_mesa_error_check_format_type(ctx, format, type, GL_FALSE)) { |
| /* found an error */ |
| 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_integer_format(format); |
| if (dstInteger != srcInteger) { |
| _mesa_error(ctx, GL_INVALID_OPERATION, |
| "glReadPixels(integer / non-integer format mismatch"); |
| return; |
| } |
| } |
| |
| if (ctx->ReadBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) { |
| _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT, |
| "glReadPixels(incomplete framebuffer)" ); |
| return; |
| } |
| |
| if (!_mesa_source_buffer_exists(ctx, format)) { |
| _mesa_error(ctx, GL_INVALID_OPERATION, "glReadPixels(no readbuffer)"); |
| return; |
| } |
| |
| if (width == 0 || height == 0) |
| return; /* nothing to do */ |
| |
| if (_mesa_is_bufferobj(ctx->Pack.BufferObj)) { |
| if (!_mesa_validate_pbo_access(2, &ctx->Pack, width, height, 1, |
| format, type, pixels)) { |
| _mesa_error(ctx, GL_INVALID_OPERATION, |
| "glReadPixels(invalid PBO access)"); |
| return; |
| } |
| |
| if (_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); |
| } |