C++ i915_context函数代码示例

static void i915_set_fragment_sampler_views(struct pipe_context *pipe,
                                            unsigned num,
                                            struct pipe_sampler_view **views)
{
   struct i915_context *i915 = i915_context(pipe);
   uint i;

   assert(num <= PIPE_MAX_SAMPLERS);

   /* Check for no-op */
   if (num == i915->num_fragment_sampler_views &&
       !memcmp(i915->fragment_sampler_views, views, num * sizeof(struct pipe_sampler_view *)))
      return;

   /* Fixes wrong texture in texobj with VBUF */
   draw_flush(i915->draw);

   for (i = 0; i < num; i++)
      pipe_sampler_view_reference(&i915->fragment_sampler_views[i],
                                  views[i]);

   for (i = num; i < i915->num_fragment_sampler_views; i++)
      pipe_sampler_view_reference(&i915->fragment_sampler_views[i],
                                  NULL);

   i915->num_fragment_sampler_views = num;

   i915->dirty |= I915_NEW_SAMPLER_VIEW;
}

static void i915_set_vertex_buffers(struct pipe_context *pipe,
                                    unsigned count,
                                    const struct pipe_vertex_buffer *buffers)
{
   struct i915_context *i915 = i915_context(pipe);
   struct draw_context *draw = i915->draw;
   int i;

   util_copy_vertex_buffers(i915->saved_vertex_buffers,
                            &i915->saved_nr_vertex_buffers,
                            buffers, count);
#if 0
   /* XXX doesn't look like this is needed */
   /* unmap old */
   for (i = 0; i < i915->num_vertex_buffers; i++) {
      draw_set_mapped_vertex_buffer(draw, i, NULL);
   }
#endif

   /* pass-through to draw module */
   draw_set_vertex_buffers(draw, count, buffers);

   /* map new */
   for (i = 0; i < count; i++) {
      void *buf = i915_buffer(buffers[i].buffer)->data;
      draw_set_mapped_vertex_buffer(draw, i, buf);
   }
}

static void i915_bind_fragment_sampler_states(struct pipe_context *pipe,
                                              unsigned start,
                                              unsigned num,
                                              void **samplers)
{
   struct i915_context *i915 = i915_context(pipe);
   unsigned i;

   /* Check for no-op */
   if (num == i915->num_samplers &&
       !memcmp(i915->fragment_sampler + start, samplers,
               num * sizeof(void *)))
      return;

   for (i = 0; i < num; ++i)
      i915->fragment_sampler[i + start] = samplers[i];

   /* find highest non-null samplers[] entry */
   {
      unsigned j = MAX2(i915->num_samplers, start + num);
      while (j > 0 && i915->fragment_sampler[j - 1] == NULL)
         j--;
      i915->num_samplers = j;
   }

   i915->dirty |= I915_NEW_SAMPLER;
}

static void i915_delete_vs_state(struct pipe_context *pipe, void *shader)
{
   struct i915_context *i915 = i915_context(pipe);

   /* just pass-through to draw module */
   draw_delete_vertex_shader(i915->draw, (struct draw_vertex_shader *) shader);
}

static void
i915_transfer_destroy(struct pipe_context *pipe,
                      struct pipe_transfer *transfer)
{
    struct i915_context *i915 = i915_context(pipe);
    util_slab_free(&i915->transfer_pool, transfer);
}

static void
i915_set_vertex_sampler_views(struct pipe_context *pipe,
                              unsigned num,
                              struct pipe_sampler_view **views)
{
   struct i915_context *i915 = i915_context(pipe);
   uint i;

   assert(num <= Elements(i915->vertex_sampler_views));

   /* Check for no-op */
   if (num == i915->num_vertex_sampler_views &&
       !memcmp(i915->vertex_sampler_views, views, num * sizeof(struct pipe_sampler_view *))) {
      return;
   }

   for (i = 0; i < Elements(i915->vertex_sampler_views); i++) {
      struct pipe_sampler_view *view = i < num ? views[i] : NULL;

      pipe_sampler_view_reference(&i915->vertex_sampler_views[i], view);
   }

   i915->num_vertex_sampler_views = num;

   draw_set_sampler_views(i915->draw,
                          PIPE_SHADER_VERTEX,
                          i915->vertex_sampler_views,
                          i915->num_vertex_sampler_views);
}

static struct pipe_transfer *
i915_get_transfer(struct pipe_context *pipe,
                  struct pipe_resource *resource,
                  unsigned level,
                  unsigned usage,
                  const struct pipe_box *box)
{
   struct i915_context *i915 = i915_context(pipe);
   struct pipe_transfer *transfer;

   if (usage & PIPE_TRANSFER_MAP_PERMANENTLY) {
      return NULL;
   }

   transfer = util_slab_alloc(&i915->transfer_pool);
   if (transfer == NULL)
      return NULL;

   transfer->resource = resource;
   transfer->level = level;
   transfer->usage = usage;
   transfer->box = *box;

   /* Note strides are zero, this is ok for buffers, but not for
    * textures 2d & higher at least. 
    */
   return transfer;
}

static void
i915_clear_depth_stencil_render(struct pipe_context *pipe,
                                struct pipe_surface *dst,
                                unsigned clear_flags,
                                double depth,
                                unsigned stencil,
                                unsigned dstx, unsigned dsty,
                                unsigned width, unsigned height)
{
   struct i915_context *i915 = i915_context(pipe);
   struct pipe_framebuffer_state fb_state;

   util_blitter_save_framebuffer(i915->blitter, &i915->framebuffer);

   fb_state.width = dst->width;
   fb_state.height = dst->height;
   fb_state.nr_cbufs = 0;
   fb_state.zsbuf = dst;
   pipe->set_framebuffer_state(pipe, &fb_state);

   if (i915->dirty)
      i915_update_derived(i915);

   i915_clear_emit(pipe, clear_flags & PIPE_CLEAR_DEPTHSTENCIL,
                   NULL, depth, stencil,
                   dstx, dsty, width, height);

   pipe->set_framebuffer_state(pipe, &i915->blitter->saved_fb_state);
   util_unreference_framebuffer_state(&i915->blitter->saved_fb_state);
   i915->blitter->saved_fb_state.nr_cbufs = ~0;
}

static void
i915_surface_copy_render(struct pipe_context *pipe,
                         struct pipe_resource *dst, unsigned dst_level,
                         unsigned dstx, unsigned dsty, unsigned dstz,
                         struct pipe_resource *src, unsigned src_level,
                         const struct pipe_box *src_box)
{
   struct i915_context *i915 = i915_context(pipe);

   /* Fallback for buffers. */
   if (dst->target == PIPE_BUFFER && src->target == PIPE_BUFFER) {
      util_resource_copy_region(pipe, dst, dst_level, dstx, dsty, dstz,
                                src, src_level, src_box);
      return;
   }

   if (!util_blitter_is_copy_supported(i915->blitter, dst, src,
                                       PIPE_MASK_RGBAZS)) {
      util_resource_copy_region(pipe, dst, dst_level, dstx, dsty, dstz,
                                src, src_level, src_box);
      return;
   }

   i915_util_blitter_save_states(i915);

   util_blitter_copy_texture(i915->blitter, dst, dst_level, dstx, dsty, dstz,
                            src, src_level, src_box, PIPE_MASK_RGBAZS, TRUE);
}

/**
 * Clear the given buffers to the specified values.
 * No masking, no scissor (clear entire buffer).
 */
void
i915_clear(struct pipe_context *pipe, unsigned buffers, const float *rgba,
           double depth, unsigned stencil)
{
   util_clear(pipe, &i915_context(pipe)->framebuffer, buffers, rgba, depth,
              stencil);
}

static void i915_set_sampler_textures(struct pipe_context *pipe,
                                      unsigned num,
                                      struct pipe_texture **texture)
{
   struct i915_context *i915 = i915_context(pipe);
   uint i;

   assert(num <= PIPE_MAX_SAMPLERS);

   /* Check for no-op */
   if (num == i915->num_textures &&
       !memcmp(i915->texture, texture, num * sizeof(struct pipe_texture *)))
      return;

   /* Fixes wrong texture in texobj with VBUF */
   draw_flush(i915->draw);

   for (i = 0; i < num; i++)
      pipe_texture_reference((struct pipe_texture **) &i915->texture[i],
                             texture[i]);

   for (i = num; i < i915->num_textures; i++)
      pipe_texture_reference((struct pipe_texture **) &i915->texture[i],
                             NULL);

   i915->num_textures = num;

   i915->dirty |= I915_NEW_TEXTURE;
}

static void
i915_blit(struct pipe_context *pipe, const struct pipe_blit_info *blit_info)
{
   struct i915_context *i915 = i915_context(pipe);
   struct pipe_blit_info info = *blit_info;

   if (util_try_blit_via_copy_region(pipe, &info)) {
      return; /* done */
   }

   if (info.mask & PIPE_MASK_S) {
      debug_printf("i915: cannot blit stencil, skipping\n");
      info.mask &= ~PIPE_MASK_S;
   }

   if (!util_blitter_is_blit_supported(i915->blitter, &info)) {
      debug_printf("i915: blit unsupported %s -> %s\n",
                   util_format_short_name(info.src.resource->format),
                   util_format_short_name(info.dst.resource->format));
      return;
   }

   i915_util_blitter_save_states(i915);

   util_blitter_blit(i915->blitter, &info);
}

static void i915_set_fragment_sampler_views(struct pipe_context *pipe,
                                            unsigned num,
                                            struct pipe_sampler_view **views)
{
   struct i915_context *i915 = i915_context(pipe);
   uint i;

   assert(num <= PIPE_MAX_SAMPLERS);

   /* Check for no-op */
   if (num == i915->num_fragment_sampler_views &&
       !memcmp(i915->fragment_sampler_views, views, num * sizeof(struct pipe_sampler_view *)))
      return;

   for (i = 0; i < num; i++) {
      /* Note: we're using pipe_sampler_view_release() here to work around
       * a possible crash when the old view belongs to another context that
       * was already destroyed.
       */
      pipe_sampler_view_release(pipe, &i915->fragment_sampler_views[i]);
      pipe_sampler_view_reference(&i915->fragment_sampler_views[i],
                                  views[i]);
   }

   for (i = num; i < i915->num_fragment_sampler_views; i++)
      pipe_sampler_view_release(pipe, &i915->fragment_sampler_views[i]);

   i915->num_fragment_sampler_views = num;

   i915->dirty |= I915_NEW_SAMPLER_VIEW;
}

static void
i915_clear_render_target_render(struct pipe_context *pipe,
                                struct pipe_surface *dst,
                                const union pipe_color_union *color,
                                unsigned dstx, unsigned dsty,
                                unsigned width, unsigned height)
{
   struct i915_context *i915 = i915_context(pipe);
   struct pipe_framebuffer_state fb_state;

   util_blitter_save_framebuffer(i915->blitter, &i915->framebuffer);

   fb_state.width = dst->width;
   fb_state.height = dst->height;
   fb_state.nr_cbufs = 1;
   fb_state.cbufs[0] = dst;
   fb_state.zsbuf = NULL;
   pipe->set_framebuffer_state(pipe, &fb_state);

   if (i915->dirty)
      i915_update_derived(i915);

   i915_clear_emit(pipe, PIPE_CLEAR_COLOR, color, 0.0, 0x0,
                   dstx, dsty, width, height);

   pipe->set_framebuffer_state(pipe, &i915->blitter->saved_fb_state);
   util_unreference_framebuffer_state(&i915->blitter->saved_fb_state);
   i915->blitter->saved_fb_state.nr_cbufs = ~0;
}

static void
i915_bind_vertex_sampler_states(struct pipe_context *pipe,
                                unsigned num_samplers,
                                void **samplers)
{
   struct i915_context *i915 = i915_context(pipe);
   unsigned i;

   assert(num_samplers <= Elements(i915->vertex_samplers));

   /* Check for no-op */
   if (num_samplers == i915->num_vertex_samplers &&
       !memcmp(i915->vertex_samplers, samplers, num_samplers * sizeof(void *)))
      return;

   for (i = 0; i < num_samplers; ++i)
      i915->vertex_samplers[i] = samplers[i];
   for (i = num_samplers; i < Elements(i915->vertex_samplers); ++i)
      i915->vertex_samplers[i] = NULL;

   i915->num_vertex_samplers = num_samplers;

   draw_set_samplers(i915->draw,
                     PIPE_SHADER_VERTEX,
                     i915->vertex_samplers,
                     i915->num_vertex_samplers);
}