add a number of PBO validate/map/unmap functions

Helper functions for (some) drivers, including swrast.
cherry-picked from Mesa/master

1 files changed, 185 insertions, 2 deletions

diff --git a/src/mesa/main/bufferobj.c b/src/mesa/main/bufferobj.c
index 009055a6ab..71e571353f 100644
--- a/src/mesa/main/bufferobj.c
+++ b/src/mesa/main/bufferobj.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"),
@@ -470,6 +470,189 @@ _mesa_validate_pbo_access(GLuint dimensions,
 
 
 /**
+ * If the source of glBitmap data is a PBO, check that we won't read out
+ * of buffer bounds, then map the buffer.
+ * If not sourcing from a PBO, just return the bitmap pointer.
+ * This is a helper function for (some) drivers.
+ * Return NULL if error.
+ * If non-null return, must call validate_and_map_bitmap_pbo() when done.
+ */
+const GLubyte *
+_mesa_validate_and_map_bitmap_pbo(GLcontext *ctx,
+                                  GLsizei width, GLsizei height,
+                                  const struct gl_pixelstore_attrib *unpack,
+                                  const GLubyte *bitmap)
+{
+   const GLubyte *buf;
+
+   if (unpack->BufferObj->Name) {
+      /* unpack from PBO */
+      if (!_mesa_validate_pbo_access(2, unpack, width, height, 1,
+                                     GL_COLOR_INDEX, GL_BITMAP,
+                                     (GLvoid *) bitmap)) {
+         _mesa_error(ctx, GL_INVALID_OPERATION,"glBitmap(invalid PBO access)");
+         return NULL;
+      }
+
+      if (unpack->BufferObj->Pointer) {
+         /* buffer is already mapped - that's an error */
+         _mesa_error(ctx, GL_INVALID_OPERATION, "glBitmap(PBO is mapped)");
+         return NULL;
+      }
+
+      buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
+                                              GL_READ_ONLY_ARB,
+                                              unpack->BufferObj);
+      if (!buf)
+         return NULL;
+
+      buf = ADD_POINTERS(buf, bitmap);
+   }
+   else {
+      /* unpack from normal memory */
+      buf = bitmap;
+   }
+
+   return buf;
+}
+
+
+/**
+ * Counterpart to validate_and_map_bitmap_pbo()
+ * This is a helper function for (some) drivers.
+ */
+void
+_mesa_unmap_bitmap_pbo(GLcontext *ctx,
+                       const struct gl_pixelstore_attrib *unpack)
+{
+   if (unpack->BufferObj->Name) {
+      ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
+                              unpack->BufferObj);
+   }
+}
+
+
+/**
+ * \sa _mesa_validate_and_map_bitmap_pbo
+ */
+const GLvoid *
+_mesa_validate_and_map_drawpix_pbo(GLcontext *ctx,
+                                   GLsizei width, GLsizei height,
+                                   GLenum format, GLenum type,
+                                   const struct gl_pixelstore_attrib *unpack,
+                                   const GLvoid *pixels)
+{
+   const GLvoid *buf;
+
+   if (unpack->BufferObj->Name) {
+      /* unpack from PBO */
+
+      if (!_mesa_validate_pbo_access(2, unpack, width, height, 1,
+                                     format, type, pixels)) {
+         _mesa_error(ctx, GL_INVALID_OPERATION,
+                     "glDrawPixels(invalid PBO access)");
+         return NULL;
+      }
+
+      if (unpack->BufferObj->Pointer) {
+         /* buffer is already mapped - that's an error */
+         _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawPixels(PBO is mapped)");
+         return NULL;
+      }
+
+      buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
+                                              GL_READ_ONLY_ARB,
+                                              unpack->BufferObj);
+      if (!buf)
+         return NULL;
+
+      buf = ADD_POINTERS(buf, pixels);
+   }
+   else {
+      /* unpack from normal memory */
+      buf = pixels;
+   }
+
+   return buf;
+}
+
+
+/**
+ * \sa _mesa_unmap_bitmap_pbo
+ */
+void
+_mesa_unmap_drapix_pbo(GLcontext *ctx,
+                       const struct gl_pixelstore_attrib *unpack)
+{
+   if (unpack->BufferObj->Name) {
+      ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_UNPACK_BUFFER_EXT,
+                              unpack->BufferObj);
+   }
+}
+
+
+/**
+ * When doing glReadPixels into a PBO, this function will check for errors
+ * and map the buffer.
+ * Call _mesa_unmap_readpix_pbo() when finished
+ * \return NULL if error
+ */
+void *
+_mesa_validate_and_map_readpix_pbo(GLcontext *ctx,
+                                   GLint x, GLint y,
+                                   GLsizei width, GLsizei height,
+                                   GLenum format, GLenum type,
+                                   const struct gl_pixelstore_attrib *pack,
+                                   GLvoid *dest)
+{
+   void *buf;
+
+   if (pack->BufferObj->Name) {
+      /* pack into PBO */
+      if (!_mesa_validate_pbo_access(2, pack, width, height, 1,
+                                     format, type, dest)) {
+         _mesa_error(ctx, GL_INVALID_OPERATION,
+                     "glReadPixels(invalid PBO access)");
+         return NULL;
+      }
+
+      if (pack->BufferObj->Pointer) {
+         /* buffer is already mapped - that's an error */
+         _mesa_error(ctx, GL_INVALID_OPERATION, "glReadPixels(PBO is mapped)");
+         return NULL;
+      }
+
+      buf = (GLubyte *) ctx->Driver.MapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT,
+                                              GL_WRITE_ONLY_ARB,
+                                              pack->BufferObj);
+      if (!buf)
+         return NULL;
+
+      buf = ADD_POINTERS(buf, dest);
+   }
+   else {
+      /* pack to normal memory */
+      buf = dest;
+   }
+
+   return buf;
+}
+
+
+/**
+ * Counterpart to validate_and_map_readpix_pbo()
+ */
+void
+_mesa_unmap_readpix_pbo(GLcontext *ctx,
+                        const struct gl_pixelstore_attrib *pack)
+{
+   if (pack->BufferObj->Name) {
+      ctx->Driver.UnmapBuffer(ctx, GL_PIXEL_PACK_BUFFER_EXT, pack->BufferObj);
+   }
+}
+
+
+/**
  * Return the gl_buffer_object for the given ID.
  * Always return NULL for ID 0.
  */