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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright 2020, Blender Foundation.
*/
/** \file
* \ingroup draw
*/
#include <stdio.h>
#include "BLI_alloca.h"
#include "BLI_sys_types.h"
#include "draw_manager.h"
typedef struct DRWLayer {
struct DRWLayer *next, *prev;
const DRWLayerType *type;
GPUFrameBuffer *framebuffer;
GPUTexture *color;
} DRWLayer;
/* TODO: Use array with DRW_layer_types_count length to avoid listbase lookups. */
static ListBase DRW_layers = {NULL}; /* DRWLayer */
static void drw_layer_recreate_textures(DRWLayer *layer)
{
DRW_TEXTURE_FREE_SAFE(layer->color);
DRW_texture_ensure_fullscreen_2d(&layer->color, GPU_RGBA8, 0);
GPU_framebuffer_ensure_config(&layer->framebuffer,
{GPU_ATTACHMENT_NONE, GPU_ATTACHMENT_TEXTURE(layer->color)});
}
static DRWLayer *drw_layer_create(const DRWLayerType *type)
{
DRWLayer *layer = MEM_callocN(sizeof(*layer), __func__);
layer->type = type;
drw_layer_recreate_textures(layer);
return layer;
}
static void drw_layer_free(DRWLayer *layer)
{
DRW_TEXTURE_FREE_SAFE(layer->color);
GPU_FRAMEBUFFER_FREE_SAFE(layer->framebuffer);
MEM_SAFE_FREE(layer);
}
static void drw_layer_ensure_updated_textures(DRWLayer *layer)
{
const float *size = DRW_viewport_size_get();
BLI_assert(layer->color);
if ((GPU_texture_width(layer->color) != size[0]) ||
(GPU_texture_height(layer->color) != size[1])) {
drw_layer_recreate_textures(layer);
}
}
static DRWLayer *drw_layer_for_type_updated_ensure(const DRWLayerType *type)
{
DRWLayer *layer = BLI_findptr(&DRW_layers, type, offsetof(DRWLayer, type));
if (layer) {
/* Ensure updated texture dimensions. */
drw_layer_ensure_updated_textures(layer);
}
else {
layer = drw_layer_create(type);
BLI_addtail(&DRW_layers, layer);
}
/* Could reinsert layer at tail here, so that the next layer to be drawn is likely first in the
* list (or at least close to the top). Iterating isn't that expensive though. */
return layer;
}
void DRW_layers_free(void)
{
LISTBASE_FOREACH_MUTABLE (DRWLayer *, layer, &DRW_layers) {
BLI_remlink(&DRW_layers, layer);
drw_layer_free(layer);
}
}
static void drw_layers_textures_draw_composited(GPUTexture *tex)
{
drw_state_set(DRW_STATE_WRITE_COLOR | DRW_STATE_BLEND_ALPHA_PREMUL);
/* Draw as texture for final render (without immediate mode). */
GPUBatch *geom = DRW_cache_fullscreen_quad_get();
GPU_batch_program_set_builtin(geom, GPU_SHADER_2D_IMAGE);
GPU_texture_bind(tex, 0);
float mat[4][4];
unit_m4(mat);
GPU_batch_uniform_mat4(geom, "ModelViewProjectionMatrix", mat);
GPU_batch_program_use_begin(geom);
GPU_batch_bind(geom);
GPU_batch_draw_advanced(geom, 0, 0, 0, 0);
GPU_batch_program_use_end(geom);
GPU_texture_unbind(tex);
}
void DRW_layers_draw_combined_cached(void)
{
/* Store if poll succeeded, to avoid calling it twice. */
bool *is_layer_visible = BLI_array_alloca(is_layer_visible, DRW_layer_types_count);
GPU_framebuffer_bind(DST.default_framebuffer);
DRW_clear_background();
/* First pass: Update dirty framebuffers and blit into cache. */
for (int i = 0; i < DRW_layer_types_count; i++) {
const DRWLayerType *layer_type = &DRW_layer_types[i];
if (layer_type->poll && !layer_type->poll()) {
is_layer_visible[i] = false;
continue;
}
is_layer_visible[i] = true;
if (layer_type->may_skip && layer_type->may_skip()) {
continue;
}
DRWLayer *layer = drw_layer_for_type_updated_ensure(layer_type);
DRW_clear_background();
DRW_state_reset();
layer_type->draw_layer();
/* Blit the default framebuffer into the layer framebuffer cache. */
GPU_framebuffer_bind(DST.default_framebuffer);
GPU_framebuffer_blit(DST.default_framebuffer, 0, layer->framebuffer, 0, GPU_COLOR_BIT);
}
BLI_assert(GPU_framebuffer_active_get() == DST.default_framebuffer);
DRW_clear_background();
for (int i = 0; i < DRW_layer_types_count; i++) {
if (!is_layer_visible[i]) {
continue;
}
const DRWLayerType *layer_type = &DRW_layer_types[i];
const DRWLayer *layer = drw_layer_for_type_updated_ensure(layer_type);
drw_layers_textures_draw_composited(layer->color);
}
GPU_framebuffer_bind(DST.default_framebuffer);
}
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