st_atom_constbuf.h File Reference

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Functions
void	st_upload_constants (struct st_context *st, struct gl_program_parameter_list *params, unsigned id)
	Pass the given program parameters to the graphics pipe as a constant buffer.

---

Function Documentation

void st_upload_constants	(	struct st_context *	st,
		struct gl_program_parameter_list *	params,
		unsigned	id
	)

Pass the given program parameters to the graphics pipe as a constant buffer.

Parameters:

id

either PIPE_SHADER_VERTEX or PIPE_SHADER_FRAGMENT

Definition at line 52 of file st_atom_constbuf.c.

References assert, pipe_constant_buffer::buffer, st_context::constants, st_context::ctx, st_context::pipe, pipe_buffer_create(), pipe_buffer_map(), pipe_buffer_reference(), pipe_buffer_unmap(), PIPE_BUFFER_USAGE_CONSTANT, PIPE_BUFFER_USAGE_CPU_WRITE, PIPE_SHADER_FRAGMENT, PIPE_SHADER_VERTEX, pipe_context::screen, pipe_context::set_constant_buffer, pipe_constant_buffer::size, and st_context::state.

{
   struct pipe_context *pipe = st->pipe;
   struct pipe_constant_buffer *cbuf = &st->state.constants[id];

   assert(id == PIPE_SHADER_VERTEX || id == PIPE_SHADER_FRAGMENT);

   /* update constants */
   if (params && params->NumParameters) {
      const uint paramBytes = params->NumParameters * sizeof(GLfloat) * 4;

      /* Update our own dependency flags.  This works because this
       * function will also be called whenever the program changes.
       */
      st->constants.tracked_state[id].dirty.mesa =
         (params->StateFlags | _NEW_PROGRAM);

      _mesa_load_state_parameters(st->ctx, params);

      /* We always need to get a new buffer, to keep the drivers simple and
       * avoid gratuitous rendering synchronization.
       */
      pipe_buffer_reference(pipe->screen, &cbuf->buffer, NULL );
      cbuf->buffer = pipe_buffer_create(pipe->screen, 16, PIPE_BUFFER_USAGE_CONSTANT,
                                        paramBytes );

      if (0)
      {
         printf("%s(shader=%d, numParams=%d, stateFlags=0x%x)\n", 
                __FUNCTION__, id, params->NumParameters, params->StateFlags);
         _mesa_print_parameter_list(params);
      }

      /* load Mesa constants into the constant buffer */
      if (cbuf->buffer) {
         void *map = pipe_buffer_map(pipe->screen, cbuf->buffer,
                                     PIPE_BUFFER_USAGE_CPU_WRITE);
         memcpy(map, params->ParameterValues, paramBytes);
         pipe_buffer_unmap(pipe->screen, cbuf->buffer);
      }

      cbuf->size = paramBytes;

      st->pipe->set_constant_buffer(st->pipe, id, 0, cbuf);
   }
   else {
      st->constants.tracked_state[id].dirty.mesa = 0;
      //  st->pipe->set_constant_buffer(st->pipe, id, 0, NULL);
   }
}

---