sp_tex_sample.h File Reference

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Functions
void	sp_get_samples (struct tgsi_sampler *sampler, const float s[QUAD_SIZE], const float t[QUAD_SIZE], const float p[QUAD_SIZE], float lodbias, float rgba[NUM_CHANNELS][QUAD_SIZE])
	Called via tgsi_sampler::get_samples() Use the sampler's state setting to get a filtered RGBA value from the sampler's texture.

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Function Documentation

void sp_get_samples	(	struct tgsi_sampler *	sampler,
		const float	s[QUAD_SIZE],
		const float	t[QUAD_SIZE],
		const float	p[QUAD_SIZE],
		float	lodbias,
		float	rgba[NUM_CHANNELS][QUAD_SIZE]
	)

Called via tgsi_sampler::get_samples() Use the sampler's state setting to get a filtered RGBA value from the sampler's texture.

XXX we can implement many versions of this function, each tightly coded for a specific combination of sampler state (nearest + repeat), (bilinear mipmap + clamp), etc.

The update_samplers() function in st_atom_sampler.c could create a new tgsi_sampler object for each state combo it finds....

Definition at line 1039 of file sp_tex_sample.c.

References assert, pipe_sampler_state::normalized_coords, PIPE_TEXTURE_1D, PIPE_TEXTURE_2D, PIPE_TEXTURE_3D, PIPE_TEXTURE_CUBE, sp_get_samples_1d(), sp_get_samples_2d(), sp_get_samples_3d(), sp_get_samples_cube(), sp_get_samples_rect(), tgsi_sampler::state, pipe_texture::target, and tgsi_sampler::texture.

{
   if (!sampler->texture)
      return;

   switch (sampler->texture->target) {
   case PIPE_TEXTURE_1D:
      assert(sampler->state->normalized_coords);
      sp_get_samples_1d(sampler, s, t, p, lodbias, rgba);
      break;
   case PIPE_TEXTURE_2D:
      if (sampler->state->normalized_coords)
         sp_get_samples_2d(sampler, s, t, p, lodbias, rgba);
      else
         sp_get_samples_rect(sampler, s, t, p, lodbias, rgba);
      break;
   case PIPE_TEXTURE_3D:
      assert(sampler->state->normalized_coords);
      sp_get_samples_3d(sampler, s, t, p, lodbias, rgba);
      break;
   case PIPE_TEXTURE_CUBE:
      assert(sampler->state->normalized_coords);
      sp_get_samples_cube(sampler, s, t, p, lodbias, rgba);
      break;
   default:
      assert(0);
   }

#if 0 /* DEBUG */
   {
      int i;
      printf("Sampled at %f, %f, %f:\n", s[0], t[0], p[0]);
      for (i = 0; i < 4; i++) {
         printf("Frag %d: %f %f %f %f\n", i,
                rgba[0][i],
                rgba[1][i],
                rgba[2][i],
                rgba[3][i]);
      }
   }
#endif
}

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