intel_fbo.c

mesa-6.5-minigui源码

/**************************************************************************
 * 
 * Copyright 2006 Tungsten Graphics, Inc., Cedar Park, Texas.
 * 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, sub license, 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 (including the
 * next paragraph) 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 NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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 "imports.h"
#include "mtypes.h"
#include "fbobject.h"
#include "framebuffer.h"
#include "renderbuffer.h"
#include "context.h"
#include "texformat.h"
#include "texrender.h"

#include "intel_context.h"
#include "intel_buffers.h"
#include "intel_bufmgr.h"
#include "intel_depthstencil.h"
#include "intel_fbo.h"
#include "intel_mipmap_tree.h"
#include "intel_regions.h"
#include "intel_span.h"

#define INTEL_RB_CLASS 0x12345678


/* XXX FBO: move this to intel_context.h (inlined) */
/**
 * Return a gl_renderbuffer ptr casted to intel_renderbuffer.
 * NULL will be returned if the rb isn't really an intel_renderbuffer.
 * This is determiend by checking the ClassID.
 */
struct intel_renderbuffer *intel_renderbuffer( struct gl_renderbuffer *rb )
{
   struct intel_renderbuffer *irb = (struct intel_renderbuffer *) rb;
   if (irb && irb->Base.ClassID == INTEL_RB_CLASS) {
      /*_mesa_warning(NULL, "Returning non-intel Rb\n");*/
      return irb;
   }
   else
      return NULL;
}


struct intel_renderbuffer *
intel_get_renderbuffer(struct gl_framebuffer *fb, GLuint attIndex)
{
   return intel_renderbuffer(fb->Attachment[attIndex].Renderbuffer);
}


struct intel_region *
intel_get_rb_region(struct gl_framebuffer *fb, GLuint attIndex)
{
   struct intel_renderbuffer *irb
      = intel_renderbuffer(fb->Attachment[attIndex].Renderbuffer);
   if (irb)
      return irb->region;
   else
      return NULL;
}



/**
 * Create a new framebuffer object.
 */
static struct gl_framebuffer *
intel_new_framebuffer(GLcontext *ctx, GLuint name)
{
   /* there's no intel_framebuffer at this time, just use Mesa's class */
   return _mesa_new_framebuffer(ctx, name);
}


static void
intel_delete_renderbuffer(struct gl_renderbuffer *rb)
{
   GET_CURRENT_CONTEXT(ctx);
   struct intel_context *intel = intel_context(ctx);
   struct intel_renderbuffer *irb = intel_renderbuffer(rb);

   ASSERT(irb);

   if (irb->PairedStencil || irb->PairedDepth) {
      intel_unpair_depth_stencil(ctx, irb);
   }

   if (intel && irb->region) {
      intel_region_release(intel, &irb->region);
   }

   _mesa_free(irb);
}



/**
 * Return a pointer to a specific pixel in a renderbuffer.
 */
static void *
intel_get_pointer(GLcontext *ctx, struct gl_renderbuffer *rb,
                  GLint x, GLint y)
{
   /* By returning NULL we force all software rendering to go through
    * the span routines.
    */
   return NULL;
}



/**
 * Called via glRenderbufferStorageEXT() to set the format and allocate
 * storage for a user-created renderbuffer.
 */
static GLboolean
intel_alloc_renderbuffer_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
                                 GLenum internalFormat,
                                 GLuint width, GLuint height)
{
   struct intel_context *intel = intel_context(ctx);
   struct intel_renderbuffer *irb = intel_renderbuffer(rb);
   GLboolean softwareBuffer = GL_FALSE;
   int cpp;

   ASSERT(rb->Name != 0);

   switch (internalFormat) {
   case GL_R3_G3_B2:
   case GL_RGB4:
   case GL_RGB5:
      rb->_ActualFormat = GL_RGB5;
      rb->DataType = GL_UNSIGNED_BYTE;
      rb->RedBits = 5;
      rb->GreenBits = 6;
      rb->BlueBits = 5;
      cpp = 2;
      break;
   case GL_RGB:
   case GL_RGB8:
   case GL_RGB10:
   case GL_RGB12:
   case GL_RGB16:
   case GL_RGBA:
   case GL_RGBA2:
   case GL_RGBA4:
   case GL_RGB5_A1:
   case GL_RGBA8:
   case GL_RGB10_A2:
   case GL_RGBA12:
   case GL_RGBA16:
      rb->_ActualFormat = GL_RGBA8;
      rb->DataType = GL_UNSIGNED_BYTE;
      rb->RedBits = 8;
      rb->GreenBits = 8;
      rb->BlueBits = 8;
      rb->AlphaBits = 8;
      cpp = 4;
      break;
   case GL_STENCIL_INDEX:
   case GL_STENCIL_INDEX1_EXT:
   case GL_STENCIL_INDEX4_EXT:
   case GL_STENCIL_INDEX8_EXT:
   case GL_STENCIL_INDEX16_EXT:
      /* alloc a depth+stencil buffer */
      rb->_ActualFormat = GL_DEPTH24_STENCIL8_EXT;
      rb->DataType = GL_UNSIGNED_INT_24_8_EXT;
      rb->StencilBits = 8;
      cpp = 4;
      break;
   case GL_DEPTH_COMPONENT16:
      rb->_ActualFormat = GL_DEPTH_COMPONENT16;
      rb->DataType = GL_UNSIGNED_SHORT;
      rb->DepthBits = 16;
      cpp = 2;
      break;
   case GL_DEPTH_COMPONENT:
   case GL_DEPTH_COMPONENT24:
   case GL_DEPTH_COMPONENT32:
      rb->_ActualFormat = GL_DEPTH24_STENCIL8_EXT;
      rb->DataType = GL_UNSIGNED_INT_24_8_EXT;
      rb->DepthBits = 24;
      cpp = 4;
      break;
   case GL_DEPTH_STENCIL_EXT:
   case GL_DEPTH24_STENCIL8_EXT:
      rb->_ActualFormat = GL_DEPTH24_STENCIL8_EXT;
      rb->DataType = GL_UNSIGNED_INT_24_8_EXT;
      rb->DepthBits = 24;
      rb->StencilBits = 8;
      cpp = 4;
      break;
   default:
      _mesa_problem(ctx, "Unexpected format in intel_alloc_renderbuffer_storage");
      return GL_FALSE;
   }

   intelFlush(ctx);

   /* free old region */
   if (irb->region) {
      /*LOCK_HARDWARE(intel);*/
      intel_region_release(intel, &irb->region);
      /*UNLOCK_HARDWARE(intel);*/
   }

   /* allocate new memory region/renderbuffer */
   if (softwareBuffer) {
      return _mesa_soft_renderbuffer_storage(ctx, rb, internalFormat,
                                             width, height);
   }
   else {
      /* Choose a pitch to match hardware requirements:
       */
      GLuint pitch = ((cpp * width + 63) & ~63) / cpp;

      /* alloc hardware renderbuffer */
      _mesa_debug(ctx, "Allocating %d x %d Intel RBO (pitch %d)\n", width, height, pitch);

      irb->region = intel_region_alloc(intel, cpp, pitch, height);
      if (!irb->region)
         return GL_FALSE; /* out of memory? */

      ASSERT(irb->region->buffer);

      rb->Width = width;
      rb->Height = height;

      /* This sets the Get/PutRow/Value functions */
      intel_set_span_functions(&irb->Base);

      return GL_TRUE;
   }
}



/**
 * Called for each hardware renderbuffer when a _window_ is resized.
 * Just update fields.
 * Not used for user-created renderbuffers!
 */
static GLboolean
intel_alloc_window_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
                           GLenum internalFormat,
                           GLuint width, GLuint height)
{
   ASSERT(rb->Name == 0);
   rb->Width = width;
   rb->Height = height;
   rb->_ActualFormat = internalFormat;
   return GL_TRUE;
}


static GLboolean
intel_nop_alloc_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
                        GLenum internalFormat,
                        GLuint width, GLuint height)
{
   _mesa_problem(ctx, "intel_op_alloc_storage should never be called.");
   return GL_FALSE;
}



/**
 * Create a new intel_renderbuffer which corresponds to an on-screen window,
 * not a user-created renderbuffer.
 * \param width  the screen width
 * \param height  the screen height
 */
struct intel_renderbuffer *
intel_create_renderbuffer(GLenum intFormat, GLsizei width, GLsizei height,
                          int offset, int pitch, int cpp, void *map)
{
   GET_CURRENT_CONTEXT(ctx);
   
   struct intel_renderbuffer *irb;
   const GLuint name = 0;

   irb = CALLOC_STRUCT(intel_renderbuffer);
   if (!irb) {
      _mesa_error(ctx, GL_OUT_OF_MEMORY, "creating renderbuffer");
      return NULL;
   }

   _mesa_init_renderbuffer(&irb->Base, name);
   irb->Base.ClassID = INTEL_RB_CLASS;

   switch (intFormat) {
   case GL_RGB5:
      irb->Base._ActualFormat = GL_RGB5;
      irb->Base._BaseFormat = GL_RGBA;
      irb->Base.RedBits = 5;
      irb->Base.GreenBits = 6;