mesa: refactor: move glReadPixels code into new readpix.c file

6 files changed, 243 insertions, 172 deletions

diff --git a/src/mesa/main/drawpix.c b/src/mesa/main/drawpix.c
index 016ddd0a81a..6db198ea3bb 100644
--- a/src/mesa/main/drawpix.c
+++ b/src/mesa/main/drawpix.c
@@ -30,114 +30,10 @@
 #include "feedback.h"
 #include "framebuffer.h"
 #include "image.h"
+#include "readpix.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
 
 /*
@@ -165,7 +61,7 @@ _mesa_DrawPixels( GLsizei width, GLsizei height,
       return;
    }
 
-   if (error_check_format_type(ctx, format, type, GL_TRUE)) {
+   if (_mesa_error_check_format_type(ctx, format, type, GL_TRUE)) {
       /* found an error */
       return;
    }
@@ -288,61 +184,6 @@ _mesa_CopyPixels( GLint srcx, GLint srcy, GLsizei width, GLsizei height,
 
 
 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 (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);
-}
-
-
-
-void GLAPIENTRY
 _mesa_Bitmap( GLsizei width, GLsizei height,
               GLfloat xorig, GLfloat yorig, GLfloat xmove, GLfloat ymove,
               const GLubyte *bitmap )
diff --git a/src/mesa/main/drawpix.h b/src/mesa/main/drawpix.h
index 2a2d7de8d81..6177adad6da 100644
--- a/src/mesa/main/drawpix.h
+++ b/src/mesa/main/drawpix.h
@@ -1,9 +1,8 @@
-
 /*
  * Mesa 3-D graphics library
- * Version:  3.5
+ * Version:  7.1
  *
- * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
+ * 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"),
@@ -28,7 +27,7 @@
 #define DRAWPIXELS_H
 
 
-#include "mtypes.h"
+#include "main/glheader.h"
 
 
 extern void GLAPIENTRY
@@ -37,11 +36,6 @@ _mesa_DrawPixels( GLsizei width, GLsizei height,
 
 
 extern void GLAPIENTRY
-_mesa_ReadPixels( GLint x, GLint y, GLsizei width, GLsizei height,
-                  GLenum format, GLenum type, GLvoid *pixels );
-
-
-extern void GLAPIENTRY
 _mesa_CopyPixels( GLint srcx, GLint srcy, GLsizei width, GLsizei height,
                   GLenum type );
 
diff --git a/src/mesa/main/readpix.c b/src/mesa/main/readpix.c
new file mode 100644
index 00000000000..dc22808e5bb
--- /dev/null
+++ b/src/mesa/main/readpix.c
@@ -0,0 +1,191 @@
+/*
+ * 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);
+}
diff --git a/src/mesa/main/readpix.h b/src/mesa/main/readpix.h
new file mode 100644
index 00000000000..1bf02fb8e4d
--- /dev/null
+++ b/src/mesa/main/readpix.h
@@ -0,0 +1,42 @@
+/*
+ * 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.
+ */
+
+
+#ifndef READPIXELS_H
+#define READPIXELS_H
+
+
+#include "main/mtypes.h"
+
+
+extern GLboolean
+_mesa_error_check_format_type(GLcontext *ctx, GLenum format, GLenum type,
+                              GLboolean drawing);
+
+extern void GLAPIENTRY
+_mesa_ReadPixels( GLint x, GLint y, GLsizei width, GLsizei height,
+                  GLenum format, GLenum type, GLvoid *pixels );
+
+
+#endif
diff --git a/src/mesa/main/sources b/src/mesa/main/sources
index ac809b22d2e..8ef5bd62fab 100644
--- a/src/mesa/main/sources
+++ b/src/mesa/main/sources
@@ -45,6 +45,7 @@ pixel.c \
 pixelstore.c \
 points.c \
 polygon.c \
+readpix.c \
 rastpos.c \
 rbadaptors.c \
 renderbuffer.c \
@@ -121,6 +122,7 @@ points.h \
 polygon.h \
 rastpos.h \
 rbadaptors.h \
+readpix.h \
 renderbuffer.h \
 simple_list.h \
 state.h \
diff --git a/src/mesa/main/state.c b/src/mesa/main/state.c
index 13a079a2dca..64f911e6993 100644
--- a/src/mesa/main/state.c
+++ b/src/mesa/main/state.c
@@ -1,8 +1,8 @@
 /*
  * Mesa 3-D graphics library
- * Version:  6.5.1
+ * Version:  7.1
  *
- * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
+ * 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"),
@@ -79,6 +79,7 @@
 #include "queryobj.h"
 #endif
 #include "rastpos.h"
+#include "readpix.h"
 #include "state.h"
 #include "stencil.h"
 #include "teximage.h"