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-rw-r--r--src/mesa/main/readpix.c191
1 files changed, 191 insertions, 0 deletions
diff --git a/src/mesa/main/readpix.c b/src/mesa/main/readpix.c
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+/*
+ * 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 "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(GLcontext *ctx, GLenum format, GLenum type,
+ GLboolean drawing)
+{
+ const char *readDraw = drawing ? "Draw" : "Read";
+
+ 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_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:
+ if (drawing && !ctx->Visual.rgbMode) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glDrawPixels(drawing RGB pixels into color index buffer)");
+ return GL_TRUE;
+ }
+ if (!drawing && !_mesa_dest_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 && ctx->Visual.rgbMode) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glReadPixels(reading color index format from RGB buffer)");
+ return GL_TRUE;
+ }
+ if (!drawing && !_mesa_dest_buffer_exists(ctx, GL_COLOR)) {
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glReadPixels(no color buffer)");
+ return GL_TRUE;
+ }
+ break;
+ case GL_STENCIL_INDEX:
+ if ((drawing && !_mesa_dest_buffer_exists(ctx, format)) ||
+ (!drawing && !_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)) ||
+ (!drawing && !_mesa_source_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)) ||
+ (!drawing && !_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;
+ }
+
+ 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 (ctx->Pack.BufferObj->Name) {
+ 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 (ctx->Pack.BufferObj->Pointer) {
+ /* 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);
+}