Addition of SDFGI for open world global illumination

Move GI to a deferred pass

servers/rendering/rasterizer_rd/shaders/scene_high_end_inc.glsl

@@ -1,6 +1,8 @@
 #define M_PI 3.14159265359
 #define ROUGHNESS_MAX_LOD 5
 
+#define MAX_GI_PROBES 8
+
 layout(push_constant, binding = 0, std430) uniform DrawCall {
 	uint instance_index;
 	uint pad; //16 bits minimum size
@@ -27,6 +29,8 @@ layout(set = 0, binding = 1) uniform sampler material_samplers[12];
 
 layout(set = 0, binding = 2) uniform sampler shadow_sampler;
 
+#define SDFGI_MAX_CASCADES 8
+
 layout(set = 0, binding = 3, std140) uniform SceneData {
 	mat4 projection_matrix;
 	mat4 inv_projection_matrix;
@@ -76,11 +80,19 @@ layout(set = 0, binding = 3, std140) uniform SceneData {
 	float ssao_ao_affect;
 	bool roughness_limiter_enabled;
 
+	float roughness_limiter_amount;
+	float roughness_limiter_limit;
+	uvec2 roughness_limiter_pad;
+
 	vec4 ao_color;
+
+	mat4 sdf_to_bounds;
+
+	ivec3 sdf_offset;
 	bool material_uv2_mode;
-	uint pad_material0;
-	uint pad_material1;
-	uint pad_material2;
+
+	ivec3 sdf_size;
+	bool gi_upscale_for_msaa;
 
 #if 0
 	vec4 ambient_light_color;
@@ -120,6 +132,8 @@ layout(set = 0, binding = 3, std140) uniform SceneData {
 
 scene_data;
 
+#define INSTANCE_FLAGS_USE_GI_BUFFERS (1 << 6)
+#define INSTANCE_FLAGS_USE_SDFGI (1 << 7)
 #define INSTANCE_FLAGS_USE_LIGHTMAP_CAPTURE (1 << 8)
 #define INSTANCE_FLAGS_USE_LIGHTMAP (1 << 9)
 #define INSTANCE_FLAGS_USE_SH_LIGHTMAP (1 << 10)
@@ -175,13 +189,18 @@ layout(set = 0, binding = 5, std430) restrict readonly buffer Lights {
 }
 lights;
 
+#define REFLECTION_AMBIENT_DISABLED 0
+#define REFLECTION_AMBIENT_ENVIRONMENT 1
+#define REFLECTION_AMBIENT_COLOR 2
+
 struct ReflectionData {
 	vec3 box_extents;
 	float index;
 	vec3 box_offset;
 	uint mask;
 	vec4 params; // intensity, 0, interior , boxproject
-	vec4 ambient; // ambient color, energy
+	vec3 ambient; // ambient color
+	uint ambient_mode;
 	mat4 local_matrix; // up to here for spot and omni, rest is for directional
 	// notes: for ambientblend, use distance to edge to blend between already existing global environment
 };
@@ -229,29 +248,6 @@ layout(set = 0, binding = 7, std140) uniform DirectionalLights {
 }
 directional_lights;
 
-struct GIProbeData {
-	mat4 xform;
-	vec3 bounds;
-	float dynamic_range;
-
-	float bias;
-	float normal_bias;
-	bool blend_ambient;
-	uint texture_slot;
-
-	float anisotropy_strength;
-	float ambient_occlusion;
-	float ambient_occlusion_size;
-	uint pad2;
-};
-
-layout(set = 0, binding = 8, std140) uniform GIProbes {
-	GIProbeData data[MAX_GI_PROBES];
-}
-gi_probes;
-
-layout(set = 0, binding = 9) uniform texture3D gi_probe_textures[MAX_GI_PROBE_TEXTURES];
-
 #define LIGHTMAP_FLAG_USE_DIRECTION 1
 #define LIGHTMAP_FLAG_USE_SPECULAR_DIRECTION 2
 
@@ -319,6 +315,41 @@ layout(set = 0, binding = 19, std430) restrict readonly buffer GlobalVariableDat
 }
 global_variables;
 
+struct SDFGIProbeCascadeData {
+	vec3 position;
+	float to_probe;
+	ivec3 probe_world_offset;
+	float to_cell; // 1/bounds * grid_size
+};
+
+layout(set = 0, binding = 20, std140) uniform SDFGI {
+	vec3 grid_size;
+	uint max_cascades;
+
+	bool use_occlusion;
+	int probe_axis_size;
+	float probe_to_uvw;
+	float normal_bias;
+
+	vec3 lightprobe_tex_pixel_size;
+	float energy;
+
+	vec3 lightprobe_uv_offset;
+	float y_mult;
+
+	vec3 occlusion_clamp;
+	uint pad3;
+
+	vec3 occlusion_renormalize;
+	uint pad4;
+
+	vec3 cascade_probe_size;
+	uint pad5;
+
+	SDFGIProbeCascadeData cascades[SDFGI_MAX_CASCADES];
+}
+sdfgi;
+
 // decal atlas
 
 /* Set 1, Radiance */
@@ -339,13 +370,57 @@ layout(set = 2, binding = 0) uniform textureCubeArray reflection_atlas;
 
 layout(set = 2, binding = 1) uniform texture2D shadow_atlas;
 
+layout(set = 2, binding = 2) uniform texture3D gi_probe_textures[MAX_GI_PROBES];
+
 /* Set 3, Render Buffers */
 
+#ifdef MODE_RENDER_SDF
+
+layout(r16ui, set = 3, binding = 0) uniform restrict writeonly uimage3D albedo_volume_grid;
+layout(r32ui, set = 3, binding = 1) uniform restrict writeonly uimage3D emission_grid;
+layout(r32ui, set = 3, binding = 2) uniform restrict writeonly uimage3D emission_aniso_grid;
+layout(r32ui, set = 3, binding = 3) uniform restrict uimage3D geom_facing_grid;
+
+//still need to be present for shaders that use it, so remap them to something
+#define depth_buffer shadow_atlas
+#define color_buffer shadow_atlas
+#define normal_roughness_buffer shadow_atlas
+
+#else
+
 layout(set = 3, binding = 0) uniform texture2D depth_buffer;
 layout(set = 3, binding = 1) uniform texture2D color_buffer;
-layout(set = 3, binding = 2) uniform texture2D normal_buffer;
-layout(set = 3, binding = 3) uniform texture2D roughness_buffer;
+layout(set = 3, binding = 2) uniform texture2D normal_roughness_buffer;
 layout(set = 3, binding = 4) uniform texture2D ao_buffer;
+layout(set = 3, binding = 5) uniform texture2D ambient_buffer;
+layout(set = 3, binding = 6) uniform texture2D reflection_buffer;
+
+layout(set = 3, binding = 7) uniform texture2DArray sdfgi_lightprobe_texture;
+
+layout(set = 3, binding = 8) uniform texture3D sdfgi_occlusion_cascades;
+
+struct GIProbeData {
+	mat4 xform;
+	vec3 bounds;
+	float dynamic_range;
+
+	float bias;
+	float normal_bias;
+	bool blend_ambient;
+	uint texture_slot;
+
+	float anisotropy_strength;
+	float ambient_occlusion;
+	float ambient_occlusion_size;
+	uint pad2;
+};
+
+layout(set = 3, binding = 9, std140) uniform GIProbes {
+	GIProbeData data[MAX_GI_PROBES];
+}
+gi_probes;
+
+#endif
 
 /* Set 4 Skeleton & Instancing (Multimesh) */