1 files changed, 435 insertions, 0 deletions
diff --git a/src/mesa/main/drawpix.c b/src/mesa/main/drawpix.c
new file mode 100644
index 0000000000..c82abccc41
--- /dev/null
+++ b/src/mesa/main/drawpix.c
@@ -0,0 +1,435 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  6.5
+ *
+ * Copyright (C) 1999-2006  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 "context.h"
+#include "drawpix.h"
+#include "feedback.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
+ */
+static GLboolean
+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;
+}
+      
+
+
+#if _HAVE_FULL_GL
+
+/*
+ * Execute glDrawPixels
+ */
+void GLAPIENTRY
+_mesa_DrawPixels( GLsizei width, GLsizei height,
+                  GLenum format, GLenum type, const GLvoid *pixels )
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+   if (width < 0 || height < 0) {
+      _mesa_error( ctx, GL_INVALID_VALUE, "glDrawPixels(width or height < 0" );
+      return;
+   }
+
+   if (ctx->NewState) {
+      _mesa_update_state(ctx);
+   }
+
+   if (ctx->FragmentProgram.Enabled && !ctx->FragmentProgram._Enabled) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "glDrawPixels (invalid fragment program)");
+      return;
+   }
+
+   if (error_check_format_type(ctx, format, type, GL_TRUE)) {
+      /* found an error */
+      return;
+   }
+
+   if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
+      _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
+                  "glDrawPixels(incomplete framebuffer)" );
+      return;
+   }
+
+   if (!ctx->Current.RasterPosValid) {
+      return;
+   }
+
+   if (ctx->RenderMode == GL_RENDER) {
+      /* Round, to satisfy conformance tests (matches SGI's OpenGL) */
+      GLint x = IROUND(ctx->Current.RasterPos[0]);
+      GLint y = IROUND(ctx->Current.RasterPos[1]);
+      ctx->Driver.DrawPixels(ctx, x, y, width, height, format, type,
+			     &ctx->Unpack, pixels);
+   }
+   else if (ctx->RenderMode == GL_FEEDBACK) {
+      /* Feedback the current raster pos info */
+      FLUSH_CURRENT( ctx, 0 );
+      FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_DRAW_PIXEL_TOKEN );
+      _mesa_feedback_vertex( ctx,
+                             ctx->Current.RasterPos,
+                             ctx->Current.RasterColor,
+                             ctx->Current.RasterIndex,
+                             ctx->Current.RasterTexCoords[0] );
+   }
+   else {
+      ASSERT(ctx->RenderMode == GL_SELECT);
+      /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
+   }
+}
+
+
+void GLAPIENTRY
+_mesa_CopyPixels( GLint srcx, GLint srcy, GLsizei width, GLsizei height,
+                  GLenum type )
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+   if (ctx->NewState) {
+      _mesa_update_state(ctx);
+   }
+
+   if (ctx->FragmentProgram.Enabled && !ctx->FragmentProgram._Enabled) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "glCopyPixels (invalid fragment program)");
+      return;
+   }
+
+   if (width < 0 || height < 0) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glCopyPixels(width or height < 0)");
+      return;
+   }
+
+   if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT ||
+       ctx->ReadBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
+      _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
+                  "glCopyPixels(incomplete framebuffer)" );
+      return;
+   }
+
+   if (!_mesa_source_buffer_exists(ctx, type) ||
+       !_mesa_dest_buffer_exists(ctx, type)) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "glCopyPixels(missing source or dest buffer)");
+      return;
+   }
+
+   if (!ctx->Current.RasterPosValid) {
+      return;
+   }
+
+   if (ctx->RenderMode == GL_RENDER) {
+      /* Round to satisfy conformance tests (matches SGI's OpenGL) */
+      GLint destx = IROUND(ctx->Current.RasterPos[0]);
+      GLint desty = IROUND(ctx->Current.RasterPos[1]);
+      ctx->Driver.CopyPixels( ctx, srcx, srcy, width, height, destx, desty,
+			      type );
+   }
+   else if (ctx->RenderMode == GL_FEEDBACK) {
+      FLUSH_CURRENT( ctx, 0 );
+      FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_COPY_PIXEL_TOKEN );
+      _mesa_feedback_vertex( ctx, 
+                             ctx->Current.RasterPos,
+                             ctx->Current.RasterColor,
+                             ctx->Current.RasterIndex,
+                             ctx->Current.RasterTexCoords[0] );
+   }
+   else {
+      ASSERT(ctx->RenderMode == GL_SELECT);
+      /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
+   }
+}
+
+#endif /* _HAVE_FULL_GL */
+
+
+
+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);
+
+   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 (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;
+   }
+
+   ctx->Driver.ReadPixels(ctx, x, y, width, height,
+			  format, type, &ctx->Pack, pixels);
+}
+
+
+
+void GLAPIENTRY
+_mesa_Bitmap( GLsizei width, GLsizei height,
+              GLfloat xorig, GLfloat yorig, GLfloat xmove, GLfloat ymove,
+              const GLubyte *bitmap )
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+   if (width < 0 || height < 0) {
+      _mesa_error( ctx, GL_INVALID_VALUE, "glBitmap(width or height < 0)" );
+      return;
+   }
+
+   if (!ctx->Current.RasterPosValid) {
+      return;    /* do nothing */
+   }
+
+   if (ctx->NewState) {
+      _mesa_update_state(ctx);
+   }
+
+   if (ctx->FragmentProgram.Enabled && !ctx->FragmentProgram._Enabled) {
+      _mesa_error(ctx, GL_INVALID_OPERATION,
+                  "glBitmap (invalid fragment program)");
+      return;
+   }
+
+   if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
+      _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
+                  "glBitmap(incomplete framebuffer)");
+      return;
+   }
+
+   if (ctx->RenderMode == GL_RENDER) {
+      if (bitmap) {
+         /* Truncate, to satisfy conformance tests (matches SGI's OpenGL). */
+         GLint x = IFLOOR(ctx->Current.RasterPos[0] - xorig);
+         GLint y = IFLOOR(ctx->Current.RasterPos[1] - yorig);
+         ctx->Driver.Bitmap( ctx, x, y, width, height, &ctx->Unpack, bitmap );
+      }
+   }
+#if _HAVE_FULL_GL
+   else if (ctx->RenderMode == GL_FEEDBACK) {
+      FLUSH_CURRENT(ctx, 0);
+      FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_BITMAP_TOKEN );
+      _mesa_feedback_vertex( ctx,
+                             ctx->Current.RasterPos,
+                             ctx->Current.RasterColor,
+                             ctx->Current.RasterIndex, 
+                             ctx->Current.RasterTexCoords[0] );
+   }
+   else {
+      ASSERT(ctx->RenderMode == GL_SELECT);
+      /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
+   }
+#endif
+
+   /* update raster position */
+   ctx->Current.RasterPos[0] += xmove;
+   ctx->Current.RasterPos[1] += ymove;
+}
+
+
+
+#if 0  /* experimental */
+/*
+ * Execute glDrawDepthPixelsMESA().  This function accepts both a color
+ * image and depth (Z) image.  Rasterization produces fragments with
+ * color and Z taken from these images.  This function is intended for
+ * Z-compositing.  Normally, this operation requires two glDrawPixels
+ * calls with stencil testing.
+ */
+void GLAPIENTRY
+_mesa_DrawDepthPixelsMESA( GLsizei width, GLsizei height,
+                           GLenum colorFormat, GLenum colorType,
+                           const GLvoid *colors,
+                           GLenum depthType, const GLvoid *depths )
+{
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+   if (width < 0 || height < 0) {
+      _mesa_error( ctx, GL_INVALID_VALUE,
+                   "glDrawDepthPixelsMESA(width or height < 0" );
+      return;
+   }
+
+   if (!ctx->Current.RasterPosValid) {
+      return;
+   }
+
+   if (ctx->NewState) {
+      _mesa_update_state(ctx);
+   }
+
+   if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
+      _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
+                  "glDrawDepthPixelsMESA(incomplete framebuffer)");
+      return;
+   }
+
+   if (ctx->RenderMode == GL_RENDER) {
+      /* Round, to satisfy conformance tests (matches SGI's OpenGL) */
+      GLint x = IROUND(ctx->Current.RasterPos[0]);
+      GLint y = IROUND(ctx->Current.RasterPos[1]);
+      ctx->Driver.DrawDepthPixelsMESA(ctx, x, y, width, height,
+                                      colorFormat, colorType, colors,
+                                      depthType, depths, &ctx->Unpack);
+   }
+   else if (ctx->RenderMode == GL_FEEDBACK) {
+      /* Feedback the current raster pos info */
+      FLUSH_CURRENT( ctx, 0 );
+      FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_DRAW_PIXEL_TOKEN );
+      _mesa_feedback_vertex( ctx,
+                             ctx->Current.RasterPos,
+                             ctx->Current.RasterColor,
+                             ctx->Current.RasterIndex,
+                             ctx->Current.RasterTexCoords[0] );
+   }
+   else {
+      ASSERT(ctx->RenderMode == GL_SELECT);
+      /* Do nothing.  See OpenGL Spec, Appendix B, Corollary 6. */
+   }
+}
+
+#endif