fbobject.c

mesa-6.5-minigui源码

   assert(fb->Name != 0);

   numImages = 0;
   fb->Width = 0;
   fb->Height = 0;

   /* Start at -2 to more easily loop over all attachment points */
   for (i = -2; i < (GLint) ctx->Const.MaxColorAttachments; i++) {
      struct gl_renderbuffer_attachment *att;
      GLenum f;

      if (i == -2) {
         att = &fb->Attachment[BUFFER_DEPTH];
         test_attachment_completeness(ctx, GL_DEPTH, att);
         if (!att->Complete) {
            fb->_Status = GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT;
            fbo_incomplete("depth attachment incomplete", -1);
            return;
         }
      }
      else if (i == -1) {
         att = &fb->Attachment[BUFFER_STENCIL];
         test_attachment_completeness(ctx, GL_STENCIL, att);
         if (!att->Complete) {
            fb->_Status = GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT;
            fbo_incomplete("stencil attachment incomplete", -1);
            return;
         }
      }
      else {
         att = &fb->Attachment[BUFFER_COLOR0 + i];
         test_attachment_completeness(ctx, GL_COLOR, att);
         if (!att->Complete) {
            fb->_Status = GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT;
            fbo_incomplete("color attachment incomplete", i);
            return;
         }
      }

      if (att->Type == GL_TEXTURE) {
         const struct gl_texture_image *texImg
            = att->Texture->Image[att->CubeMapFace][att->TextureLevel];
         w = texImg->Width;
         h = texImg->Height;
         f = texImg->_BaseFormat;
         numImages++;
         if (f != GL_RGB && f != GL_RGBA && f != GL_DEPTH_COMPONENT
             && f != GL_DEPTH_STENCIL_EXT) {
            fb->_Status = GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT;
            fbo_incomplete("texture attachment incomplete", -1);
            return;
         }
      }
      else if (att->Type == GL_RENDERBUFFER_EXT) {
         w = att->Renderbuffer->Width;
         h = att->Renderbuffer->Height;
         f = att->Renderbuffer->InternalFormat;
         numImages++;
      }
      else {
         assert(att->Type == GL_NONE);
         continue;
      }

      if (numImages == 1) {
         /* set required width, height and format */
         width = w;
         height = h;
         if (i >= 0)
            intFormat = f;
      }
      else {
         /* check that width, height, format are same */
         if (w != width || h != height) {
            fb->_Status = GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT;
            fbo_incomplete("width or height mismatch", -1);
            return;
         }
         if (intFormat != GL_NONE && f != intFormat) {
            fb->_Status = GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT;
            fbo_incomplete("format mismatch", -1);
            return;
         }
      }
   }

   /* Check that all DrawBuffers are present */
   for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
      if (fb->ColorDrawBuffer[i] != GL_NONE) {
         const struct gl_renderbuffer_attachment *att
            = _mesa_get_attachment(ctx, fb, fb->ColorDrawBuffer[i]);
         assert(att);
         if (att->Type == GL_NONE) {
            fb->_Status = GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT;
            fbo_incomplete("missing drawbuffer", i);
            return;
         }
      }
   }

   /* Check that the ReadBuffer is present */
   if (fb->ColorReadBuffer != GL_NONE) {
      const struct gl_renderbuffer_attachment *att
         = _mesa_get_attachment(ctx, fb, fb->ColorReadBuffer);
      assert(att);
      if (att->Type == GL_NONE) {
         fb->_Status = GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT;
            fbo_incomplete("missing readbuffer", -1);
         return;
      }
   }

   /* Check if any renderbuffer is attached more than once.
    * Note that there's one exception: a GL_DEPTH_STENCIL renderbuffer can be
    * bound to both the stencil and depth attachment points at the same time.
    */
   for (i = 0; i < BUFFER_COUNT - 1; i++) {
      struct gl_renderbuffer *rb_i = fb->Attachment[i].Renderbuffer;
      if (rb_i) {
         GLint j;
         for (j = i + 1; j < BUFFER_COUNT; j++) {
            struct gl_renderbuffer *rb_j = fb->Attachment[j].Renderbuffer;
            if (rb_i == rb_j && rb_i->_BaseFormat != GL_DEPTH_STENCIL_EXT) {
               fb->_Status = GL_FRAMEBUFFER_INCOMPLETE_DUPLICATE_ATTACHMENT_EXT;
               fbo_incomplete("multiply bound renderbuffer", -1);
               return;
            }
         }
      }
   }


   if (numImages == 0) {
      fb->_Status = GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT;
      fbo_incomplete("no attachments", -1);
      return;
   }

   /*
    * If we get here, the framebuffer is complete!
    */
   fb->_Status = GL_FRAMEBUFFER_COMPLETE_EXT;
   fb->Width = w;
   fb->Height = h;
}


GLboolean GLAPIENTRY
_mesa_IsRenderbufferEXT(GLuint renderbuffer)
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
   if (renderbuffer) {
      struct gl_renderbuffer *rb = _mesa_lookup_renderbuffer(ctx, renderbuffer);
      if (rb != NULL && rb != &DummyRenderbuffer)
         return GL_TRUE;
   }
   return GL_FALSE;
}


void GLAPIENTRY
_mesa_BindRenderbufferEXT(GLenum target, GLuint renderbuffer)
{
   struct gl_renderbuffer *newRb, *oldRb;
   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

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

   FLUSH_VERTICES(ctx, _NEW_BUFFERS);

   if (renderbuffer) {
      newRb = _mesa_lookup_renderbuffer(ctx, renderbuffer);
      if (newRb == &DummyRenderbuffer) {
         /* ID was reserved, but no real renderbuffer object made yet */
         newRb = NULL;
      }
      if (!newRb) {
	 /* create new renderbuffer object */
	 newRb = ctx->Driver.NewRenderbuffer(ctx, renderbuffer);
	 if (!newRb) {
	    _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBindRenderbufferEXT");
	    return;
	 }
         ASSERT(newRb->AllocStorage);
         _mesa_HashInsert(ctx->Shared->RenderBuffers, renderbuffer, newRb);
      }
      newRb->RefCount++;
   }
   else {
      newRb = NULL;
   }

   oldRb = ctx->CurrentRenderbuffer;
   if (oldRb) {
      oldRb->RefCount--;
      if (oldRb->RefCount == 0) {
         oldRb->Delete(oldRb);
      }
   }

   ASSERT(newRb != &DummyRenderbuffer);

   ctx->CurrentRenderbuffer = newRb;
}


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

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

   for (i = 0; i < n; i++) {
      if (renderbuffers[i] > 0) {
	 struct gl_renderbuffer *rb;
	 rb = _mesa_lookup_renderbuffer(ctx, renderbuffers[i]);
	 if (rb) {
            /* check if deleting currently bound renderbuffer object */
            if (rb == ctx->CurrentRenderbuffer) {
               /* bind default */
               ASSERT(rb->RefCount >= 2);
               _mesa_BindRenderbufferEXT(GL_RENDERBUFFER_EXT, 0);
            }

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

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


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

   ASSERT_OUTSIDE_BEGIN_END(ctx);

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

   if (!renderbuffers)
      return;

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

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


/**
 * Given an internal format token for a render buffer, return the
 * corresponding base format.
 * This is very similar to _mesa_base_tex_format() but the set of valid
 * internal formats is somewhat different.
 *
 * \return one of GL_RGB, GL_RGBA, GL_STENCIL_INDEX, GL_DEPTH_COMPONENT
 *  GL_DEPTH_STENCIL_EXT or zero if error.
 */
GLenum
_mesa_base_fbo_format(GLcontext *ctx, GLenum internalFormat)
{
   switch (internalFormat) {
   case GL_RGB:
   case GL_R3_G3_B2:
   case GL_RGB4:
   case GL_RGB5:
   case GL_RGB8:
   case GL_RGB10:
   case GL_RGB12:
   case GL_RGB16:
      return GL_RGB;
   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:
      return GL_RGBA;
   case GL_STENCIL_INDEX:
   case GL_STENCIL_INDEX1_EXT:
   case GL_STENCIL_INDEX4_EXT:
   case GL_STENCIL_INDEX8_EXT:
   case GL_STENCIL_INDEX16_EXT:
      return GL_STENCIL_INDEX;
   case GL_DEPTH_COMPONENT:
   case GL_DEPTH_COMPONENT16:
   case GL_DEPTH_COMPONENT24:
   case GL_DEPTH_COMPONENT32:
      return GL_DEPTH_COMPONENT;
   case GL_DEPTH_STENCIL_EXT:
   case GL_DEPTH24_STENCIL8_EXT:
      if (ctx->Extensions.EXT_packed_depth_stencil)
         return GL_DEPTH_STENCIL_EXT;
      else
         return 0;
   /* XXX add floating point formats eventually */
   default:
      return 0;
   }
}


void GLAPIENTRY
_mesa_RenderbufferStorageEXT(GLenum target, GLenum internalFormat,
                             GLsizei width, GLsizei height)
{
   struct gl_renderbuffer *rb;
   GLenum baseFormat;
   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

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

   baseFormat = _mesa_base_fbo_format(ctx, internalFormat);
   if (baseFormat == 0) {
      _mesa_error(ctx, GL_INVALID_ENUM,
                  "glRenderbufferStorageEXT(internalFormat)");
      return;
   }

   if (width < 1 || width > ctx->Const.MaxRenderbufferSize) {
      _mesa_error(ctx, GL_INVALID_VALUE, "glRenderbufferStorageEXT(width)");
      return;
   }

   if (height < 1 || height > ctx->Const.MaxRenderbufferSize) {
      _mesa_error(ctx, GL_INVALID_VALUE, "glRenderbufferStorageEXT(height)");
      return;
   }

   rb = ctx->CurrentRenderbuffer;

   if (!rb) {
      _mesa_error(ctx, GL_INVALID_OPERATION, "glRenderbufferStorageEXT");
      return;
   }

   FLUSH_VERTICES(ctx, _NEW_BUFFERS);

   if (rb->InternalFormat == internalFormat &&
       rb->Width == width &&
       rb->Height == height) {
      /* no change in allocation needed */
      return;
   }

   /* These MUST get set by the AllocStorage func */
   rb->_ActualFormat = 0;
   rb->RedBits =
   rb->GreenBits =
   rb->BlueBits =
   rb->AlphaBits =
   rb->IndexBits =
   rb->DepthBits =
   rb->StencilBits = 0;

   /* Now allocate the storage */
   ASSERT(rb->AllocStorage);
   if (rb->AllocStorage(ctx, rb, internalFormat, width, height)) {
      /* No error - check/set fields now */
      assert(rb->_ActualFormat);
      assert(rb->Width == width);
      assert(rb->Height == height);
      assert(rb->RedBits || rb->GreenBits || rb->BlueBits || rb->AlphaBits ||
             rb->DepthBits || rb->StencilBits || rb->IndexBits);
      rb->InternalFormat = internalFormat;
      rb->_BaseFormat = baseFormat;
   }
   else {
      /* Probably ran out of memory - clear the fields */
      rb->Width = 0;
      rb->Height = 0;