345 lines
14 KiB
C
345 lines
14 KiB
C
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright 2016, Blender Foundation.
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*/
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/** \file
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* \ingroup draw_engine
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*
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* Screen space reflections and refractions techniques.
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*/
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#include "DRW_render.h"
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#include "BLI_dynstr.h"
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#include "BLI_string_utils.h"
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#include "DEG_depsgraph_query.h"
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#include "eevee_private.h"
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#include "GPU_texture.h"
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/* SSR shader variations */
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enum {
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SSR_RESOLVE = (1 << 0),
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SSR_FULL_TRACE = (1 << 1),
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SSR_AO = (1 << 3),
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SSR_MAX_SHADER = (1 << 4),
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};
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static struct {
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/* Screen Space Reflection */
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struct GPUShader *ssr_sh[SSR_MAX_SHADER];
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/* These are just references, not actually allocated */
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struct GPUTexture *depth_src;
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struct GPUTexture *color_src;
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} e_data = {{NULL}}; /* Engine data */
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extern char datatoc_ambient_occlusion_lib_glsl[];
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extern char datatoc_common_view_lib_glsl[];
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extern char datatoc_common_uniforms_lib_glsl[];
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extern char datatoc_bsdf_common_lib_glsl[];
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extern char datatoc_bsdf_sampling_lib_glsl[];
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extern char datatoc_octahedron_lib_glsl[];
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extern char datatoc_effect_ssr_frag_glsl[];
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extern char datatoc_lightprobe_lib_glsl[];
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extern char datatoc_raytrace_lib_glsl[];
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static struct GPUShader *eevee_effects_screen_raytrace_shader_get(int options)
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{
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if (e_data.ssr_sh[options] == NULL) {
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char *ssr_shader_str = BLI_string_joinN(datatoc_common_view_lib_glsl,
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datatoc_common_uniforms_lib_glsl,
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datatoc_bsdf_common_lib_glsl,
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datatoc_bsdf_sampling_lib_glsl,
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datatoc_ambient_occlusion_lib_glsl,
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datatoc_octahedron_lib_glsl,
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datatoc_lightprobe_lib_glsl,
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datatoc_raytrace_lib_glsl,
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datatoc_effect_ssr_frag_glsl);
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DynStr *ds_defines = BLI_dynstr_new();
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BLI_dynstr_append(ds_defines, SHADER_DEFINES);
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if (options & SSR_RESOLVE) {
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BLI_dynstr_append(ds_defines, "#define STEP_RESOLVE\n");
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}
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else {
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BLI_dynstr_append(ds_defines, "#define STEP_RAYTRACE\n");
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BLI_dynstr_append(ds_defines, "#define PLANAR_PROBE_RAYTRACE\n");
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}
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if (options & SSR_FULL_TRACE) {
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BLI_dynstr_append(ds_defines, "#define FULLRES\n");
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}
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if (options & SSR_AO) {
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BLI_dynstr_append(ds_defines, "#define SSR_AO\n");
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}
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char *ssr_define_str = BLI_dynstr_get_cstring(ds_defines);
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BLI_dynstr_free(ds_defines);
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e_data.ssr_sh[options] = DRW_shader_create_fullscreen(ssr_shader_str, ssr_define_str);
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MEM_freeN(ssr_shader_str);
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MEM_freeN(ssr_define_str);
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}
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return e_data.ssr_sh[options];
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}
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int EEVEE_screen_raytrace_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata)
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{
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EEVEE_CommonUniformBuffer *common_data = &sldata->common_data;
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EEVEE_StorageList *stl = vedata->stl;
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EEVEE_FramebufferList *fbl = vedata->fbl;
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EEVEE_TextureList *txl = vedata->txl;
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EEVEE_EffectsInfo *effects = stl->effects;
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const float *viewport_size = DRW_viewport_size_get();
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const DRWContextState *draw_ctx = DRW_context_state_get();
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const Scene *scene_eval = DEG_get_evaluated_scene(draw_ctx->depsgraph);
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/* Compute pixel size, (shared with contact shadows) */
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copy_v2_v2(common_data->ssr_pixelsize, viewport_size);
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invert_v2(common_data->ssr_pixelsize);
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if (scene_eval->eevee.flag & SCE_EEVEE_SSR_ENABLED) {
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const bool use_refraction = (scene_eval->eevee.flag & SCE_EEVEE_SSR_REFRACTION) != 0;
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if (use_refraction) {
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/* TODO: Opti: Could be shared. */
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DRW_texture_ensure_fullscreen_2d(
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&txl->refract_color, GPU_R11F_G11F_B10F, DRW_TEX_FILTER | DRW_TEX_MIPMAP);
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GPU_framebuffer_ensure_config(
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&fbl->refract_fb, {GPU_ATTACHMENT_NONE, GPU_ATTACHMENT_TEXTURE(txl->refract_color)});
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}
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const bool is_persp = DRW_view_is_persp_get(NULL);
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if (effects->ssr_was_persp != is_persp) {
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effects->ssr_was_persp = is_persp;
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DRW_viewport_request_redraw();
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EEVEE_temporal_sampling_reset(vedata);
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stl->g_data->valid_double_buffer = false;
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}
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if (!effects->ssr_was_valid_double_buffer) {
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DRW_viewport_request_redraw();
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EEVEE_temporal_sampling_reset(vedata);
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}
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effects->ssr_was_valid_double_buffer = stl->g_data->valid_double_buffer;
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effects->reflection_trace_full = (scene_eval->eevee.flag & SCE_EEVEE_SSR_HALF_RESOLUTION) == 0;
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common_data->ssr_thickness = scene_eval->eevee.ssr_thickness;
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common_data->ssr_border_fac = scene_eval->eevee.ssr_border_fade;
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common_data->ssr_firefly_fac = scene_eval->eevee.ssr_firefly_fac;
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common_data->ssr_max_roughness = scene_eval->eevee.ssr_max_roughness;
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common_data->ssr_quality = 1.0f - 0.95f * scene_eval->eevee.ssr_quality;
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common_data->ssr_brdf_bias = 0.1f + common_data->ssr_quality * 0.6f; /* Range [0.1, 0.7]. */
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if (common_data->ssr_firefly_fac < 1e-8f) {
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common_data->ssr_firefly_fac = FLT_MAX;
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}
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const int divisor = (effects->reflection_trace_full) ? 1 : 2;
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int tracing_res[2] = {(int)viewport_size[0] / divisor, (int)viewport_size[1] / divisor};
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int size_fs[2] = {(int)viewport_size[0], (int)viewport_size[1]};
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const bool high_qual_input = true; /* TODO dither low quality input */
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const eGPUTextureFormat format = (high_qual_input) ? GPU_RGBA16F : GPU_RGBA8;
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tracing_res[0] = max_ii(1, tracing_res[0]);
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tracing_res[1] = max_ii(1, tracing_res[1]);
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/* MRT for the shading pass in order to output needed data for the SSR pass. */
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effects->ssr_specrough_input = DRW_texture_pool_query_2d(
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size_fs[0], size_fs[1], format, &draw_engine_eevee_type);
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GPU_framebuffer_texture_attach(fbl->main_fb, effects->ssr_specrough_input, 2, 0);
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/* Raytracing output */
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effects->ssr_hit_output = DRW_texture_pool_query_2d(
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tracing_res[0], tracing_res[1], GPU_RG16I, &draw_engine_eevee_type);
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effects->ssr_pdf_output = DRW_texture_pool_query_2d(
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tracing_res[0], tracing_res[1], GPU_R16F, &draw_engine_eevee_type);
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GPU_framebuffer_ensure_config(&fbl->screen_tracing_fb,
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{GPU_ATTACHMENT_NONE,
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GPU_ATTACHMENT_TEXTURE(effects->ssr_hit_output),
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GPU_ATTACHMENT_TEXTURE(effects->ssr_pdf_output)});
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/* Enable double buffering to be able to read previous frame color */
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return EFFECT_SSR | EFFECT_NORMAL_BUFFER | EFFECT_DOUBLE_BUFFER |
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((use_refraction) ? EFFECT_REFRACT : 0);
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}
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/* Cleanup to release memory */
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GPU_FRAMEBUFFER_FREE_SAFE(fbl->screen_tracing_fb);
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effects->ssr_specrough_input = NULL;
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effects->ssr_hit_output = NULL;
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effects->ssr_pdf_output = NULL;
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return 0;
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}
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void EEVEE_screen_raytrace_cache_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata)
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{
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EEVEE_PassList *psl = vedata->psl;
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EEVEE_StorageList *stl = vedata->stl;
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EEVEE_TextureList *txl = vedata->txl;
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EEVEE_EffectsInfo *effects = stl->effects;
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LightCache *lcache = stl->g_data->light_cache;
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struct GPUBatch *quad = DRW_cache_fullscreen_quad_get();
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if ((effects->enabled_effects & EFFECT_SSR) != 0) {
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int options = (effects->reflection_trace_full) ? SSR_FULL_TRACE : 0;
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options |= ((effects->enabled_effects & EFFECT_GTAO) != 0) ? SSR_AO : 0;
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struct GPUShader *trace_shader = eevee_effects_screen_raytrace_shader_get(options);
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struct GPUShader *resolve_shader = eevee_effects_screen_raytrace_shader_get(SSR_RESOLVE |
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options);
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/** Screen space raytracing overview
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*
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* Following Frostbite stochastic SSR.
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*
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* - First pass Trace rays across the depth buffer. The hit position and pdf are
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* recorded in a RGBA16F render target for each ray (sample).
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*
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* - We down-sample the previous frame color buffer.
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*
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* - For each final pixel, we gather neighbors rays and choose a color buffer
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* mipmap for each ray using its pdf. (filtered importance sampling)
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* We then evaluate the lighting from the probes and mix the results together.
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*/
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DRW_PASS_CREATE(psl->ssr_raytrace, DRW_STATE_WRITE_COLOR);
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DRWShadingGroup *grp = DRW_shgroup_create(trace_shader, psl->ssr_raytrace);
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DRW_shgroup_uniform_texture_ref(grp, "depthBuffer", &e_data.depth_src);
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DRW_shgroup_uniform_texture_ref(grp, "normalBuffer", &effects->ssr_normal_input);
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DRW_shgroup_uniform_texture_ref(grp, "specroughBuffer", &effects->ssr_specrough_input);
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DRW_shgroup_uniform_texture_ref(grp, "maxzBuffer", &txl->maxzbuffer);
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DRW_shgroup_uniform_texture_ref(grp, "planarDepth", &vedata->txl->planar_depth);
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DRW_shgroup_uniform_texture(grp, "utilTex", EEVEE_materials_get_util_tex());
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DRW_shgroup_uniform_block(grp, "grid_block", sldata->grid_ubo);
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DRW_shgroup_uniform_block(grp, "probe_block", sldata->probe_ubo);
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DRW_shgroup_uniform_block(grp, "planar_block", sldata->planar_ubo);
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DRW_shgroup_uniform_block(grp, "common_block", sldata->common_ubo);
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if (!effects->reflection_trace_full) {
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DRW_shgroup_uniform_ivec2(grp, "halfresOffset", effects->ssr_halfres_ofs, 1);
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}
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DRW_shgroup_call(grp, quad, NULL);
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DRW_PASS_CREATE(psl->ssr_resolve, DRW_STATE_WRITE_COLOR | DRW_STATE_BLEND_ADD);
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grp = DRW_shgroup_create(resolve_shader, psl->ssr_resolve);
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DRW_shgroup_uniform_texture_ref(grp, "depthBuffer", &e_data.depth_src);
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DRW_shgroup_uniform_texture_ref(grp, "normalBuffer", &effects->ssr_normal_input);
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DRW_shgroup_uniform_texture_ref(grp, "specroughBuffer", &effects->ssr_specrough_input);
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DRW_shgroup_uniform_texture_ref(grp, "probeCubes", &lcache->cube_tx.tex);
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DRW_shgroup_uniform_texture_ref(grp, "probePlanars", &vedata->txl->planar_pool);
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DRW_shgroup_uniform_texture_ref(grp, "planarDepth", &vedata->txl->planar_depth);
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DRW_shgroup_uniform_texture_ref(grp, "hitBuffer", &effects->ssr_hit_output);
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DRW_shgroup_uniform_texture_ref(grp, "pdfBuffer", &effects->ssr_pdf_output);
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DRW_shgroup_uniform_texture_ref(grp, "prevColorBuffer", &txl->color_double_buffer);
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DRW_shgroup_uniform_block(grp, "grid_block", sldata->grid_ubo);
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DRW_shgroup_uniform_block(grp, "probe_block", sldata->probe_ubo);
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DRW_shgroup_uniform_block(grp, "planar_block", sldata->planar_ubo);
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DRW_shgroup_uniform_block(grp, "common_block", sldata->common_ubo);
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DRW_shgroup_uniform_int(grp, "neighborOffset", &effects->ssr_neighbor_ofs, 1);
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if ((effects->enabled_effects & EFFECT_GTAO) != 0) {
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DRW_shgroup_uniform_texture(grp, "utilTex", EEVEE_materials_get_util_tex());
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DRW_shgroup_uniform_texture_ref(grp, "horizonBuffer", &effects->gtao_horizons);
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}
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DRW_shgroup_call(grp, quad, NULL);
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}
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}
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void EEVEE_refraction_compute(EEVEE_ViewLayerData *UNUSED(sldata), EEVEE_Data *vedata)
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{
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EEVEE_FramebufferList *fbl = vedata->fbl;
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EEVEE_TextureList *txl = vedata->txl;
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EEVEE_StorageList *stl = vedata->stl;
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EEVEE_EffectsInfo *effects = stl->effects;
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if ((effects->enabled_effects & EFFECT_REFRACT) != 0) {
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GPU_framebuffer_blit(fbl->main_fb, 0, fbl->refract_fb, 0, GPU_COLOR_BIT);
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EEVEE_downsample_buffer(vedata, txl->refract_color, 9);
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/* Restore */
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GPU_framebuffer_bind(fbl->main_fb);
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}
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}
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void EEVEE_reflection_compute(EEVEE_ViewLayerData *UNUSED(sldata), EEVEE_Data *vedata)
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{
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EEVEE_PassList *psl = vedata->psl;
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EEVEE_FramebufferList *fbl = vedata->fbl;
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EEVEE_StorageList *stl = vedata->stl;
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EEVEE_TextureList *txl = vedata->txl;
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EEVEE_EffectsInfo *effects = stl->effects;
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if (((effects->enabled_effects & EFFECT_SSR) != 0) && stl->g_data->valid_double_buffer) {
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DefaultTextureList *dtxl = DRW_viewport_texture_list_get();
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e_data.depth_src = dtxl->depth;
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DRW_stats_group_start("SSR");
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/* Raytrace. */
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GPU_framebuffer_bind(fbl->screen_tracing_fb);
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DRW_draw_pass(psl->ssr_raytrace);
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EEVEE_downsample_buffer(vedata, txl->color_double_buffer, 9);
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/* Resolve at fullres */
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int sample = (DRW_state_is_image_render()) ? effects->taa_render_sample :
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effects->taa_current_sample;
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/* Doing a neighbor shift only after a few iteration.
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* We wait for a prime number of cycles to avoid noise correlation.
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* This reduces variance faster. */
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effects->ssr_neighbor_ofs = ((sample / 5) % 8) * 4;
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switch ((sample / 11) % 4) {
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case 0:
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effects->ssr_halfres_ofs[0] = 0;
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effects->ssr_halfres_ofs[1] = 0;
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break;
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case 1:
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effects->ssr_halfres_ofs[0] = 0;
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effects->ssr_halfres_ofs[1] = 1;
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break;
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case 2:
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effects->ssr_halfres_ofs[0] = 1;
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effects->ssr_halfres_ofs[1] = 0;
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break;
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case 4:
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effects->ssr_halfres_ofs[0] = 1;
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effects->ssr_halfres_ofs[1] = 1;
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break;
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}
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GPU_framebuffer_bind(fbl->main_color_fb);
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DRW_draw_pass(psl->ssr_resolve);
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/* Restore */
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GPU_framebuffer_bind(fbl->main_fb);
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DRW_stats_group_end();
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}
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}
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void EEVEE_screen_raytrace_free(void)
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{
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for (int i = 0; i < SSR_MAX_SHADER; ++i) {
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DRW_SHADER_FREE_SAFE(e_data.ssr_sh[i]);
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}
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}
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