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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_engine
*
* Transparent Pipeline:
*
* Use Weight Blended Order Independent Transparency to render transparent surfaces.
*
* The rendering is broken down in two passes:
* - the accumulation pass where we render all the surfaces and accumulate all the weights.
* - the resolve pass where we divide the accumulated information by the weights.
*
* An additional re-render of the transparent surfaces is sometime done in order to have their
* correct depth and object ids correctly written.
*/
#include "DRW_render.h"
#include "ED_view3d.h"
#include "GPU_extensions.h"
#include "workbench_engine.h"
#include "workbench_private.h"
void workbench_transparent_engine_init(WORKBENCH_Data *data)
{
WORKBENCH_FramebufferList *fbl = data->fbl;
WORKBENCH_PrivateData *wpd = data->stl->wpd;
DefaultTextureList *dtxl = DRW_viewport_texture_list_get();
DrawEngineType *owner = (DrawEngineType *)&workbench_transparent_engine_init;
/* Reuse same format as opaque pipeline to reuse the textures. */
/* Note: Floating point texture is required for the reveal_tex as it is used for
* the alpha accumulation component (see accumulation shader for more explanation). */
const eGPUTextureFormat accum_tex_format = GPU_RGBA16F;
const eGPUTextureFormat reveal_tex_format = NORMAL_ENCODING_ENABLED() ? GPU_RG16F : GPU_RGBA32F;
wpd->accum_buffer_tx = DRW_texture_pool_query_fullscreen(accum_tex_format, owner);
wpd->reveal_buffer_tx = DRW_texture_pool_query_fullscreen(reveal_tex_format, owner);
GPU_framebuffer_ensure_config(&fbl->transp_accum_fb,
{
GPU_ATTACHMENT_TEXTURE(dtxl->depth),
GPU_ATTACHMENT_TEXTURE(wpd->accum_buffer_tx),
GPU_ATTACHMENT_TEXTURE(wpd->reveal_buffer_tx),
});
}
static void workbench_transparent_lighting_uniforms(WORKBENCH_PrivateData *wpd,
DRWShadingGroup *grp)
{
DRW_shgroup_uniform_block(grp, "world_block", wpd->world_ubo);
DRW_shgroup_uniform_bool_copy(grp, "forceShadowing", false);
if (STUDIOLIGHT_TYPE_MATCAP_ENABLED(wpd)) {
BKE_studiolight_ensure_flag(wpd->studio_light,
STUDIOLIGHT_MATCAP_DIFFUSE_GPUTEXTURE |
STUDIOLIGHT_MATCAP_SPECULAR_GPUTEXTURE);
struct GPUTexture *diff_tx = wpd->studio_light->matcap_diffuse.gputexture;
struct GPUTexture *spec_tx = wpd->studio_light->matcap_specular.gputexture;
const bool use_spec = workbench_is_specular_highlight_enabled(wpd);
spec_tx = (use_spec && spec_tx) ? spec_tx : diff_tx;
DRW_shgroup_uniform_texture(grp, "matcapDiffuseImage", diff_tx);
DRW_shgroup_uniform_texture(grp, "matcapSpecularImage", spec_tx);
}
}
void workbench_transparent_cache_init(WORKBENCH_Data *data)
{
WORKBENCH_PassList *psl = data->psl;
WORKBENCH_PrivateData *wpd = data->stl->wpd;
struct GPUShader *sh;
DRWShadingGroup *grp;
{
int transp = 1;
for (int infront = 0; infront < 2; infront++) {
DRWState state = DRW_STATE_WRITE_COLOR | DRW_STATE_DEPTH_LESS_EQUAL | DRW_STATE_BLEND_OIT;
DRWPass *pass;
if (infront) {
DRW_PASS_CREATE(psl->transp_accum_infront_ps, state | wpd->cull_state | wpd->clip_state);
pass = psl->transp_accum_infront_ps;
}
else {
DRW_PASS_CREATE(psl->transp_accum_ps, state | wpd->cull_state | wpd->clip_state);
pass = psl->transp_accum_ps;
}
for (int hair = 0; hair < 2; hair++) {
wpd->prepass[transp][infront][hair].material_hash = BLI_ghash_ptr_new(__func__);
sh = workbench_shader_transparent_get(wpd, hair);
wpd->prepass[transp][infront][hair].common_shgrp = grp = DRW_shgroup_create(sh, pass);
DRW_shgroup_uniform_block(grp, "material_block", wpd->material_ubo_curr);
DRW_shgroup_uniform_int_copy(grp, "materialIndex", -1);
workbench_transparent_lighting_uniforms(wpd, grp);
wpd->prepass[transp][infront][hair].vcol_shgrp = grp = DRW_shgroup_create(sh, pass);
DRW_shgroup_uniform_block(grp, "material_block", wpd->material_ubo_curr);
DRW_shgroup_uniform_int_copy(grp, "materialIndex", 0); /* Default material. (uses vcol) */
sh = workbench_shader_transparent_image_get(wpd, hair, false);
wpd->prepass[transp][infront][hair].image_shgrp = grp = DRW_shgroup_create(sh, pass);
DRW_shgroup_uniform_block(grp, "material_block", wpd->material_ubo_curr);
DRW_shgroup_uniform_int_copy(grp, "materialIndex", 0); /* Default material. */
workbench_transparent_lighting_uniforms(wpd, grp);
sh = workbench_shader_transparent_image_get(wpd, hair, true);
wpd->prepass[transp][infront][hair].image_tiled_shgrp = grp = DRW_shgroup_create(sh, pass);
DRW_shgroup_uniform_block(grp, "material_block", wpd->material_ubo_curr);
DRW_shgroup_uniform_int_copy(grp, "materialIndex", 0); /* Default material. */
workbench_transparent_lighting_uniforms(wpd, grp);
}
}
}
{
DRWState state = DRW_STATE_WRITE_COLOR | DRW_STATE_BLEND_ALPHA;
DRW_PASS_CREATE(psl->transp_resolve_ps, state);
sh = workbench_shader_transparent_resolve_get(wpd);
grp = DRW_shgroup_create(sh, psl->transp_resolve_ps);
DRW_shgroup_uniform_texture(grp, "transparentAccum", wpd->accum_buffer_tx);
DRW_shgroup_uniform_texture(grp, "transparentRevealage", wpd->reveal_buffer_tx);
DRW_shgroup_call_procedural_triangles(grp, NULL, 1);
}
}
/* Redraw the transparent passes but with depth test
* to output correct outline IDs and depth. */
void workbench_transparent_draw_depth_pass(WORKBENCH_Data *data)
{
WORKBENCH_PrivateData *wpd = data->stl->wpd;
WORKBENCH_FramebufferList *fbl = data->fbl;
WORKBENCH_PassList *psl = data->psl;
const bool do_xray_depth_pass = !XRAY_FLAG_ENABLED(wpd) || XRAY_ALPHA(wpd) > 0.0f;
const bool do_transparent_depth_pass = psl->outline_ps || wpd->dof_enabled || do_xray_depth_pass;
if (do_transparent_depth_pass) {
DRWState state = DRW_STATE_WRITE_COLOR | DRW_STATE_WRITE_DEPTH | DRW_STATE_DEPTH_LESS_EQUAL;
if (!DRW_pass_is_empty(psl->transp_accum_ps)) {
GPU_framebuffer_bind(fbl->opaque_fb);
/* TODO(fclem) Disable writing to first two buffers. Unnecessary waste of bandwidth. */
DRW_pass_state_set(psl->transp_accum_ps, state | wpd->cull_state | wpd->clip_state);
DRW_draw_pass(psl->transp_accum_ps);
}
if (!DRW_pass_is_empty(psl->transp_accum_infront_ps)) {
GPU_framebuffer_bind(fbl->opaque_infront_fb);
/* TODO(fclem) Disable writing to first two buffers. Unnecessary waste of bandwidth. */
DRW_pass_state_set(psl->transp_accum_infront_ps, state | wpd->cull_state | wpd->clip_state);
DRW_draw_pass(psl->transp_accum_infront_ps);
}
}
}
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