245 lines
6.4 KiB
GLSL
245 lines
6.4 KiB
GLSL
#[vertex]
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#version 450
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VERSION_DEFINES
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layout(location = 0) out vec2 uv_interp;
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layout(push_constant, binding = 1, std430) uniform Params {
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mat3 orientation;
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vec4 proj;
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vec4 position_multiplier;
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float time;
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}
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params;
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void main() {
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vec2 base_arr[4] = vec2[](vec2(-1.0, -1.0), vec2(-1.0, 1.0), vec2(1.0, 1.0), vec2(1.0, -1.0));
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uv_interp = base_arr[gl_VertexIndex];
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gl_Position = vec4(uv_interp, 1.0, 1.0);
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}
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#[fragment]
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#version 450
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VERSION_DEFINES
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#define M_PI 3.14159265359
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layout(location = 0) in vec2 uv_interp;
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layout(push_constant, binding = 1, std430) uniform Params {
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mat3 orientation;
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vec4 proj;
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vec4 position_multiplier;
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float time; //TODO consider adding vec2 screen res, and float radiance size
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}
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params;
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#define SAMPLER_NEAREST_CLAMP 0
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#define SAMPLER_LINEAR_CLAMP 1
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#define SAMPLER_NEAREST_WITH_MIPMAPS_CLAMP 2
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#define SAMPLER_LINEAR_WITH_MIPMAPS_CLAMP 3
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#define SAMPLER_NEAREST_WITH_MIPMAPS_ANISOTROPIC_CLAMP 4
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#define SAMPLER_LINEAR_WITH_MIPMAPS_ANISOTROPIC_CLAMP 5
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#define SAMPLER_NEAREST_REPEAT 6
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#define SAMPLER_LINEAR_REPEAT 7
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#define SAMPLER_NEAREST_WITH_MIPMAPS_REPEAT 8
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#define SAMPLER_LINEAR_WITH_MIPMAPS_REPEAT 9
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#define SAMPLER_NEAREST_WITH_MIPMAPS_ANISOTROPIC_REPEAT 10
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#define SAMPLER_LINEAR_WITH_MIPMAPS_ANISOTROPIC_REPEAT 11
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layout(set = 0, binding = 0) uniform sampler material_samplers[12];
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layout(set = 0, binding = 1, std430) restrict readonly buffer GlobalVariableData {
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vec4 data[];
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}
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global_variables;
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layout(set = 0, binding = 2, std140) uniform SceneData {
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bool volumetric_fog_enabled;
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float volumetric_fog_inv_length;
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float volumetric_fog_detail_spread;
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float fog_aerial_perspective;
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vec3 fog_light_color;
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float fog_sun_scatter;
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bool fog_enabled;
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float fog_density;
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float z_far;
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uint directional_light_count;
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}
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scene_data;
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struct DirectionalLightData {
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vec4 direction_energy;
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vec4 color_size;
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bool enabled;
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};
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layout(set = 0, binding = 3, std140) uniform DirectionalLights {
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DirectionalLightData data[MAX_DIRECTIONAL_LIGHT_DATA_STRUCTS];
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}
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directional_lights;
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#ifdef USE_MATERIAL_UNIFORMS
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layout(set = 1, binding = 0, std140) uniform MaterialUniforms{
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/* clang-format off */
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MATERIAL_UNIFORMS
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/* clang-format on */
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} material;
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#endif
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layout(set = 2, binding = 0) uniform textureCube radiance;
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#ifdef USE_CUBEMAP_PASS
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layout(set = 2, binding = 1) uniform textureCube half_res;
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layout(set = 2, binding = 2) uniform textureCube quarter_res;
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#else
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layout(set = 2, binding = 1) uniform texture2D half_res;
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layout(set = 2, binding = 2) uniform texture2D quarter_res;
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#endif
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layout(set = 3, binding = 0) uniform texture3D volumetric_fog_texture;
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#ifdef USE_CUBEMAP_PASS
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#define AT_CUBEMAP_PASS true
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#else
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#define AT_CUBEMAP_PASS false
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#endif
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#ifdef USE_HALF_RES_PASS
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#define AT_HALF_RES_PASS true
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#else
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#define AT_HALF_RES_PASS false
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#endif
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#ifdef USE_QUARTER_RES_PASS
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#define AT_QUARTER_RES_PASS true
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#else
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#define AT_QUARTER_RES_PASS false
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#endif
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/* clang-format off */
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FRAGMENT_SHADER_GLOBALS
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/* clang-format on */
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layout(location = 0) out vec4 frag_color;
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vec4 volumetric_fog_process(vec2 screen_uv) {
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vec3 fog_pos = vec3(screen_uv, 1.0);
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return texture(sampler3D(volumetric_fog_texture, material_samplers[SAMPLER_LINEAR_CLAMP]), fog_pos);
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}
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vec4 fog_process(vec3 view, vec3 sky_color) {
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vec3 fog_color = mix(scene_data.fog_light_color, sky_color, scene_data.fog_aerial_perspective);
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if (scene_data.fog_sun_scatter > 0.001) {
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vec4 sun_scatter = vec4(0.0);
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float sun_total = 0.0;
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for (uint i = 0; i < scene_data.directional_light_count; i++) {
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vec3 light_color = directional_lights.data[i].color_size.xyz * directional_lights.data[i].direction_energy.w;
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float light_amount = pow(max(dot(view, directional_lights.data[i].direction_energy.xyz), 0.0), 8.0);
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fog_color += light_color * light_amount * scene_data.fog_sun_scatter;
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}
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}
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float fog_amount = clamp(1.0 - exp(-scene_data.z_far * scene_data.fog_density), 0.0, 1.0);
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return vec4(fog_color, fog_amount);
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}
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void main() {
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vec3 cube_normal;
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cube_normal.z = -1.0;
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cube_normal.x = (cube_normal.z * (-uv_interp.x - params.proj.x)) / params.proj.y;
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cube_normal.y = -(cube_normal.z * (-uv_interp.y - params.proj.z)) / params.proj.w;
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cube_normal = mat3(params.orientation) * cube_normal;
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cube_normal.z = -cube_normal.z;
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cube_normal = normalize(cube_normal);
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vec2 uv = uv_interp * 0.5 + 0.5;
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vec2 panorama_coords = vec2(atan(cube_normal.x, cube_normal.z), acos(cube_normal.y));
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if (panorama_coords.x < 0.0) {
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panorama_coords.x += M_PI * 2.0;
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}
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panorama_coords /= vec2(M_PI * 2.0, M_PI);
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vec3 color = vec3(0.0, 0.0, 0.0);
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float alpha = 1.0; // Only available to subpasses
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vec4 half_res_color = vec4(1.0);
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vec4 quarter_res_color = vec4(1.0);
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#ifdef USE_CUBEMAP_PASS
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vec3 inverted_cube_normal = cube_normal;
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inverted_cube_normal.z *= -1.0;
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#ifdef USES_HALF_RES_COLOR
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half_res_color = texture(samplerCube(half_res, material_samplers[SAMPLER_LINEAR_WITH_MIPMAPS_CLAMP]), inverted_cube_normal);
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#endif
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#ifdef USES_QUARTER_RES_COLOR
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quarter_res_color = texture(samplerCube(quarter_res, material_samplers[SAMPLER_LINEAR_WITH_MIPMAPS_CLAMP]), inverted_cube_normal);
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#endif
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#else
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#ifdef USES_HALF_RES_COLOR
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half_res_color = textureLod(sampler2D(half_res, material_samplers[SAMPLER_LINEAR_CLAMP]), uv, 0.0);
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#endif
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#ifdef USES_QUARTER_RES_COLOR
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quarter_res_color = textureLod(sampler2D(quarter_res, material_samplers[SAMPLER_LINEAR_CLAMP]), uv, 0.0);
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#endif
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#endif
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// unused, just here to make our compiler happy, make sure we don't execute any light code the user adds in..
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#ifndef REALLYINCLUDETHIS
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{
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/* clang-format off */
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LIGHT_SHADER_CODE
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/* clang-format on */
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}
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#endif
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{
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/* clang-format off */
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FRAGMENT_SHADER_CODE
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/* clang-format on */
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}
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frag_color.rgb = color * params.position_multiplier.w;
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frag_color.a = alpha;
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#if !defined(DISABLE_FOG) && !defined(USE_CUBEMAP_PASS)
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// Draw "fixed" fog before volumetric fog to ensure volumetric fog can appear in front of the sky.
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if (scene_data.fog_enabled) {
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vec4 fog = fog_process(cube_normal, frag_color.rgb);
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frag_color.rgb = mix(frag_color.rgb, fog.rgb, fog.a);
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}
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if (scene_data.volumetric_fog_enabled) {
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vec4 fog = volumetric_fog_process(uv);
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frag_color.rgb = mix(frag_color.rgb, fog.rgb, fog.a);
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}
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#endif // DISABLE_FOG
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// Blending is disabled for Sky, so alpha doesn't blend
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// alpha is used for subsurface scattering so make sure it doesn't get applied to Sky
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if (!AT_CUBEMAP_PASS && !AT_HALF_RES_PASS && !AT_QUARTER_RES_PASS) {
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frag_color.a = 0.0;
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}
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}
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