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Eevee: Overhaul the volumetric system.

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The system now uses several 3D textures in order to decouple every steps of the volumetric rendering.

See https://www.ea.com/frostbite/news/physically-based-unified-volumetric-rendering-in-frostbite for more details.

On the technical side, instead of using a compute shader to populate the 3D textures we use layered rendering with a geometry shader to render 1 fullscreen triangle per 3D texture slice.
This commit is contained in:
Clément Foucault
2017-10-24 14:49:00 +02:00
parent 1c0c63ce5b
commit 66d8f82b83
20 changed files with 798 additions and 593 deletions
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54
source/blender/draw/engines/eevee/eevee_private.h
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@@ -46,16 +46,31 @@ extern struct DrawEngineType draw_engine_eevee_type;
// #define IRRADIANCE_CUBEMAP
#define IRRADIANCE_HL2
#if defined(IRRADIANCE_SH_L2)
#define SHADER_IRRADIANCE "#define IRRADIANCE_SH_L2\n"
#elif defined(IRRADIANCE_CUBEMAP)
#define SHADER_IRRADIANCE "#define IRRADIANCE_CUBEMAP\n"
#elif defined(IRRADIANCE_HL2)
#define SHADER_IRRADIANCE "#define IRRADIANCE_HL2\n"
#endif
#define SHADER_DEFINES \
"#define EEVEE_ENGINE\n" \
"#define MAX_PROBE " STRINGIFY(MAX_PROBE) "\n" \
"#define MAX_GRID " STRINGIFY(MAX_GRID) "\n" \
"#define MAX_PLANAR " STRINGIFY(MAX_PLANAR) "\n" \
"#define MAX_LIGHT " STRINGIFY(MAX_LIGHT) "\n" \
"#define MAX_SHADOW " STRINGIFY(MAX_SHADOW) "\n" \
"#define MAX_SHADOW_CUBE " STRINGIFY(MAX_SHADOW_CUBE) "\n" \
"#define MAX_SHADOW_CASCADE " STRINGIFY(MAX_SHADOW_CASCADE) "\n" \
"#define MAX_CASCADE_NUM " STRINGIFY(MAX_CASCADE_NUM) "\n" \
SHADER_IRRADIANCE
/* World shader variations */
enum {
VAR_WORLD_BACKGROUND = 0,
VAR_WORLD_PROBE = 1,
VAR_WORLD_VOLUME = 2,
VAR_VOLUME_SHADOW = (1 << 2),
VAR_VOLUME_HOMO = (1 << 3),
VAR_VOLUME_LIGHT = (1 << 4),
VAR_VOLUME_COLOR = (1 << 5),
};
/* Material shader variations */
@@ -117,9 +132,10 @@ typedef struct EEVEE_PassList {
struct DRWPass *dof_down;
struct DRWPass *dof_scatter;
struct DRWPass *dof_resolve;
struct DRWPass *volumetric_integrate_ps;
struct DRWPass *volumetric_ps;
struct DRWPass *volumetric_scatter_ps;
struct DRWPass *volumetric_integration_ps;
struct DRWPass *volumetric_resolve_ps;
struct DRWPass *volumetric_resolve_transmit_ps;
struct DRWPass *ssr_raytrace;
struct DRWPass *ssr_resolve;
struct DRWPass *color_downsample_ps;
@@ -164,6 +180,8 @@ typedef struct EEVEE_FramebufferList {
struct GPUFrameBuffer *dof_scatter_far_fb;
struct GPUFrameBuffer *dof_scatter_near_fb;
struct GPUFrameBuffer *volumetric_fb;
struct GPUFrameBuffer *volumetric_scat_fb;
struct GPUFrameBuffer *volumetric_integ_fb;
struct GPUFrameBuffer *screen_tracing_fb;
struct GPUFrameBuffer *refract_fb;
@@ -189,6 +207,15 @@ typedef struct EEVEE_TextureList {
struct GPUTexture *ssr_specrough_input;
struct GPUTexture *refract_color;
struct GPUTexture *volume_prop_scattering;
struct GPUTexture *volume_prop_extinction;
struct GPUTexture *volume_prop_emission;
struct GPUTexture *volume_prop_phase;
struct GPUTexture *volume_scatter;
struct GPUTexture *volume_transmittance;
struct GPUTexture *volume_scatter_history;
struct GPUTexture *volume_transmittance_history;
struct GPUTexture *planar_pool;
struct GPUTexture *planar_depth;
@@ -250,7 +277,12 @@ typedef struct EEVEE_ShadowRender {
typedef struct EEVEE_VolumetricsInfo {
float integration_step_count, shadow_step_count, sample_distribution, light_clamp;
float integration_start, integration_end;
bool use_lights, use_volume_shadows, use_colored_transmit;
float depth_param[3], history_alpha;
bool use_lights, use_volume_shadows;
int froxel_tex_size[3];
float inv_tex_size[3];
float volume_coord_scale[2];
float jitter[3];
} EEVEE_VolumetricsInfo;
/* ************ LIGHT DATA ************* */
@@ -532,8 +564,6 @@ typedef struct EEVEE_PrivateData {
struct GHash *hair_material_hash;
struct GPUTexture *minzbuffer;
struct GPUTexture *ssr_hit_output[4];
struct GPUTexture *volumetric;
struct GPUTexture *volumetric_transmit;
struct GPUTexture *gtao_horizons_debug;
float background_alpha; /* TODO find a better place for this. */
float viewvecs[2][4];
@@ -561,9 +591,7 @@ void EEVEE_materials_cache_populate(EEVEE_Data *vedata, EEVEE_SceneLayerData *sl
void EEVEE_materials_cache_finish(EEVEE_Data *vedata);
struct GPUMaterial *EEVEE_material_world_lightprobe_get(struct Scene *scene, struct World *wo);
struct GPUMaterial *EEVEE_material_world_background_get(struct Scene *scene, struct World *wo);
struct GPUMaterial *EEVEE_material_world_volume_get(
struct Scene *scene, struct World *wo, bool use_lights, bool use_volume_shadows, bool is_homogeneous, bool use_color_transmit,
int shadow_method);
struct GPUMaterial *EEVEE_material_world_volume_get(struct Scene *scene, struct World *wo);
struct GPUMaterial *EEVEE_material_mesh_get(
struct Scene *scene, Material *ma, bool use_blend, bool use_multiply, bool use_refract, int shadow_method);
struct GPUMaterial *EEVEE_material_mesh_depth_get(struct Scene *scene, Material *ma, bool use_hashed_alpha, bool is_shadow);