fbobject.c

mesa-6.5-minigui源码

      rb->InternalFormat = GL_NONE;
      rb->_ActualFormat = GL_NONE;
      rb->_BaseFormat = GL_NONE;
      rb->RedBits =
      rb->GreenBits =
      rb->BlueBits =
      rb->AlphaBits =
      rb->IndexBits =
      rb->DepthBits =
      rb->StencilBits = 0;
   }

   /*
   test_framebuffer_completeness(ctx, fb);
   */
   /* XXX if this renderbuffer is attached anywhere, invalidate attachment
    * points???
    */
}


void GLAPIENTRY
_mesa_GetRenderbufferParameterivEXT(GLenum target, GLenum pname, GLint *params)
{
   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (target != GL_RENDERBUFFER_EXT) {
      _mesa_error(ctx, GL_INVALID_ENUM,
                  "glGetRenderbufferParameterivEXT(target)");
      return;
   }

   if (!ctx->CurrentRenderbuffer) {
      _mesa_error(ctx, GL_INVALID_OPERATION,
                  "glGetRenderbufferParameterivEXT");
      return;
   }

   FLUSH_VERTICES(ctx, _NEW_BUFFERS);

   switch (pname) {
   case GL_RENDERBUFFER_WIDTH_EXT:
      *params = ctx->CurrentRenderbuffer->Width;
      return;
   case GL_RENDERBUFFER_HEIGHT_EXT:
      *params = ctx->CurrentRenderbuffer->Height;
      return;
   case GL_RENDERBUFFER_INTERNAL_FORMAT_EXT:
      *params = ctx->CurrentRenderbuffer->InternalFormat;
      return;
   case GL_RENDERBUFFER_RED_SIZE_EXT:
      *params = ctx->CurrentRenderbuffer->RedBits;
      break;
   case GL_RENDERBUFFER_GREEN_SIZE_EXT:
      *params = ctx->CurrentRenderbuffer->GreenBits;
      break;
   case GL_RENDERBUFFER_BLUE_SIZE_EXT:
      *params = ctx->CurrentRenderbuffer->BlueBits;
      break;
   case GL_RENDERBUFFER_ALPHA_SIZE_EXT:
      *params = ctx->CurrentRenderbuffer->AlphaBits;
      break;
   case GL_RENDERBUFFER_DEPTH_SIZE_EXT:
      *params = ctx->CurrentRenderbuffer->DepthBits;
      break;
   case GL_RENDERBUFFER_STENCIL_SIZE_EXT:
      *params = ctx->CurrentRenderbuffer->StencilBits;
      break;
   default:
      _mesa_error(ctx, GL_INVALID_ENUM,
                  "glGetRenderbufferParameterivEXT(target)");
      return;
   }
}


GLboolean GLAPIENTRY
_mesa_IsFramebufferEXT(GLuint framebuffer)
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
   if (framebuffer) {
      struct gl_framebuffer *rb = _mesa_lookup_framebuffer(ctx, framebuffer);
      if (rb != NULL && rb != &DummyFramebuffer)
         return GL_TRUE;
   }
   return GL_FALSE;
}


static void
check_begin_texture_render(GLcontext *ctx, struct gl_framebuffer *fb)
{
   GLuint i;
   ASSERT(ctx->Driver.RenderTexture);
   for (i = 0; i < BUFFER_COUNT; i++) {
      struct gl_renderbuffer_attachment *att = fb->Attachment + i;
      struct gl_texture_object *texObj = att->Texture;
      if (texObj
          && att->Texture->Image[att->CubeMapFace][att->TextureLevel]) {
         ctx->Driver.RenderTexture(ctx, fb, att);
      }
   }
}


/**
 * Examine all the framebuffer's attachments to see if any are textures.
 * If so, call ctx->Driver.FinishRenderTexture() for each texture to
 * notify the device driver that the texture image may have changed.
 */
static void
check_end_texture_render(GLcontext *ctx, struct gl_framebuffer *fb)
{
   if (ctx->Driver.FinishRenderTexture) {
      GLuint i;
      for (i = 0; i < BUFFER_COUNT; i++) {
         struct gl_renderbuffer_attachment *att = fb->Attachment + i;
         struct gl_texture_object *texObj = att->Texture;
         if (texObj) {
            ctx->Driver.FinishRenderTexture(ctx, att);
         }
      }
   }
}


void GLAPIENTRY
_mesa_BindFramebufferEXT(GLenum target, GLuint framebuffer)
{
   struct gl_framebuffer *newFb, *oldFb;
   GLboolean bindReadBuf, bindDrawBuf;
   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (!ctx->Extensions.EXT_framebuffer_object) {
      _mesa_error(ctx, GL_INVALID_OPERATION,
                  "glBindFramebufferEXT(unsupported)");
      return;
   }

   switch (target) {
#if FEATURE_EXT_framebuffer_blit
   case GL_DRAW_FRAMEBUFFER_EXT:
      if (!ctx->Extensions.EXT_framebuffer_blit) {
         _mesa_error(ctx, GL_INVALID_ENUM, "glBindFramebufferEXT(target)");
         return;
      }
      bindDrawBuf = GL_TRUE;
      bindReadBuf = GL_FALSE;
      break;
   case GL_READ_FRAMEBUFFER_EXT:
      if (!ctx->Extensions.EXT_framebuffer_blit) {
         _mesa_error(ctx, GL_INVALID_ENUM, "glBindFramebufferEXT(target)");
         return;
      }
      bindDrawBuf = GL_FALSE;
      bindReadBuf = GL_TRUE;
      break;
#endif
   case GL_FRAMEBUFFER_EXT:
      bindDrawBuf = GL_TRUE;
      bindReadBuf = GL_TRUE;
      break;
   default:
      _mesa_error(ctx, GL_INVALID_ENUM, "glBindFramebufferEXT(target)");
      return;
   }

   FLUSH_VERTICES(ctx, _NEW_BUFFERS);

   if (framebuffer) {
      /* Binding a user-created framebuffer object */
      newFb = _mesa_lookup_framebuffer(ctx, framebuffer);
      if (newFb == &DummyFramebuffer) {
         /* ID was reserved, but no real framebuffer object made yet */
         newFb = NULL;
      }
      if (!newFb) {
	 /* create new framebuffer object */
	 newFb = ctx->Driver.NewFramebuffer(ctx, framebuffer);
	 if (!newFb) {
	    _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBindFramebufferEXT");
	    return;
	 }
         _mesa_HashInsert(ctx->Shared->FrameBuffers, framebuffer, newFb);
      }
      _glthread_LOCK_MUTEX(newFb->Mutex);
      if (bindReadBuf)
         newFb->RefCount++;
      if (bindDrawBuf)
         newFb->RefCount++;
      _glthread_UNLOCK_MUTEX(newFb->Mutex);
   }
   else {
      /* Binding the window system framebuffer (which was originally set
       * with MakeCurrent).
       */
      newFb = ctx->WinSysDrawBuffer;
   }

   ASSERT(newFb);
   ASSERT(newFb != &DummyFramebuffer);

   /*
    * XXX check if re-binding same buffer and skip some of this code.
    */

   if (bindReadBuf) {
      oldFb = ctx->ReadBuffer;
      if (oldFb && oldFb->Name != 0) {
         _glthread_LOCK_MUTEX(oldFb->Mutex);
         oldFb->RefCount--;
         _glthread_UNLOCK_MUTEX(oldFb->Mutex);
         if (oldFb->RefCount == 0) {
            oldFb->Delete(oldFb);
         }
      }
      ctx->ReadBuffer = newFb;
   }

   if (bindDrawBuf) {
      oldFb = ctx->DrawBuffer;
      if (oldFb && oldFb->Name != 0) {
         /* check if old FB had any texture attachments */
         check_end_texture_render(ctx, oldFb);
         /* check if time to delete this framebuffer */
         _glthread_LOCK_MUTEX(oldFb->Mutex);
         oldFb->RefCount--;
         if (oldFb->RefCount == 0) {
            oldFb->Delete(oldFb);
         }
         _glthread_UNLOCK_MUTEX(oldFb->Mutex);
      }
      ctx->DrawBuffer = newFb;
      if (newFb->Name != 0) {
         /* check if newly bound framebuffer has any texture attachments */
         check_begin_texture_render(ctx, newFb);
      }
   }

   if (ctx->Driver.BindFramebuffer) {
      ctx->Driver.BindFramebuffer(ctx, target, newFb);
   }
}


void GLAPIENTRY
_mesa_DeleteFramebuffersEXT(GLsizei n, const GLuint *framebuffers)
{
   GLint i;
   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);
   FLUSH_VERTICES(ctx, _NEW_BUFFERS);

   for (i = 0; i < n; i++) {
      if (framebuffers[i] > 0) {
	 struct gl_framebuffer *fb;
	 fb = _mesa_lookup_framebuffer(ctx, framebuffers[i]);
	 if (fb) {
            ASSERT(fb == &DummyFramebuffer || fb->Name == framebuffers[i]);

            /* check if deleting currently bound framebuffer object */
            if (fb == ctx->DrawBuffer) {
               /* bind default */
               ASSERT(fb->RefCount >= 2);
               _mesa_BindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
            }

	    /* remove from hash table immediately, to free the ID */
	    _mesa_HashRemove(ctx->Shared->FrameBuffers, framebuffers[i]);

            if (fb != &DummyFramebuffer) {
               /* But the object will not be freed until it's no longer
                * bound in any context.
                */
               _glthread_LOCK_MUTEX(fb->Mutex);
               fb->RefCount--;
               _glthread_UNLOCK_MUTEX(fb->Mutex);
               if (fb->RefCount == 0) {
                  fb->Delete(fb);
               }
	    }
	 }
      }
   }
}


void GLAPIENTRY
_mesa_GenFramebuffersEXT(GLsizei n, GLuint *framebuffers)
{
   GET_CURRENT_CONTEXT(ctx);
   GLuint first;
   GLint i;

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (n < 0) {
      _mesa_error(ctx, GL_INVALID_VALUE, "glGenFramebuffersEXT(n)");
      return;
   }

   if (!framebuffers)
      return;

   first = _mesa_HashFindFreeKeyBlock(ctx->Shared->FrameBuffers, n);

   for (i = 0; i < n; i++) {
      GLuint name = first + i;
      framebuffers[i] = name;
      /* insert dummy placeholder into hash table */
      _glthread_LOCK_MUTEX(ctx->Shared->Mutex);
      _mesa_HashInsert(ctx->Shared->FrameBuffers, name, &DummyFramebuffer);
      _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
   }
}



GLenum GLAPIENTRY
_mesa_CheckFramebufferStatusEXT(GLenum target)
{
   struct gl_framebuffer *buffer;
   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, 0);

   switch (target) {
#if FEATURE_EXT_framebuffer_blit
   case GL_DRAW_FRAMEBUFFER_EXT:
      if (!ctx->Extensions.EXT_framebuffer_blit) {
         _mesa_error(ctx, GL_INVALID_ENUM, "glCheckFramebufferStatus(target)");
         return 0;
      }
      buffer = ctx->DrawBuffer;
      break;
   case GL_READ_FRAMEBUFFER_EXT:
      if (!ctx->Extensions.EXT_framebuffer_blit) {
         _mesa_error(ctx, GL_INVALID_ENUM, "glCheckFramebufferStatus(target)");
         return 0;
      }
      buffer = ctx->ReadBuffer;
      break;
#endif
   case GL_FRAMEBUFFER_EXT:
      buffer = ctx->DrawBuffer;
      break;
   default:
      _mesa_error(ctx, GL_INVALID_ENUM, "glCheckFramebufferStatus(target)");
      return 0; /* formerly GL_FRAMEBUFFER_STATUS_ERROR_EXT */
   }

   if (buffer->Name == 0) {
      /* The window system / default framebuffer is always complete */
      return GL_FRAMEBUFFER_COMPLETE_EXT;
   }

   FLUSH_VERTICES(ctx, _NEW_BUFFERS);

   _mesa_test_framebuffer_completeness(ctx, buffer);
   return buffer->_Status;
}



/**
 * Common code called by glFramebufferTexture1D/2D/3DEXT().
 */
static void
framebuffer_texture(GLuint dims, GLenum target, GLenum attachment,
                    GLenum textarget, GLuint texture,
                    GLint level, GLint zoffset)
{
   struct gl_renderbuffer_attachment *att;
   struct gl_texture_object *texObj = NULL;
   struct gl_framebuffer *fb;
   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (target != GL_FRAMEBUFFER_EXT) {
      _mesa_error(ctx, GL_INVALID_ENUM,
                  "glFramebufferTexture%dDEXT(target)", dims);
      return;
   }

   fb = ctx->DrawBuffer;
   ASSERT(fb);

   /* check framebuffer binding */
   if (fb->Name == 0) {
      _mesa_error(ctx, GL_INVALID_OPERATION,
                  "glFramebufferTexture%dDEXT", dims);
      return;
   }

   if (texture) {
      texObj = _mesa_lookup_texture(ctx, texture);
   }

   /* Check dimension-dependent things */
   switch (dims) {
   case 1:
      if (textarget != GL_TEXTURE_1D) {
         _mesa_error(ctx, GL_INVALID_ENUM,
                     "glFramebufferTexture1DEXT(textarget)");
         return;