763 lines
20 KiB
GLSL
763 lines
20 KiB
GLSL
/* clang-format off */
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[vertex]
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/* clang-format on */
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#version 450
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/* clang-format off */
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VERSION_DEFINES
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/* clang-format on */
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/* INPUT ATTRIBS */
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layout(location = 0) in vec3 vertex_attrib;
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/* clang-format on */
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layout(location = 1) in vec3 normal_attrib;
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#if defined(TANGENT_USED) || defined(NORMALMAP_USED) || defined(LIGHT_ANISOTROPY_USED)
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layout(location = 2) in vec4 tangent_attrib;
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#endif
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#if defined(COLOR_USED)
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layout(location = 3) in vec4 color_attrib;
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#endif
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#if defined(UV_USED)
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layout(location = 4) in vec2 uv_attrib;
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#endif
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#if defined(UV2_USED) || defined(USE_LIGHTMAP)
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layout(location = 5) in vec2 uv2_attrib;
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#endif
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layout(location = 6) in uvec4 bone_attrib; // always bound, even if unused
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/* Varyings */
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out vec3 vertex_interp;
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out vec3 normal_interp;
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#if defined(COLOR_USED)
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out vec4 color_interp;
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#endif
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#if defined(UV2_USED) || defined(USE_LIGHTMAP)
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out vec2 uv_interp;
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#endif
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//uv2 may be used for lightmapping, so always pass.
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#if !defined(MODE_RENDER_DEPTH)
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out vec2 uv2_interp;
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#endif
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#if defined(TANGENT_USED) || defined(NORMALMAP_USED) || defined(LIGHT_ANISOTROPY_USED)
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out vec3 tangent_interp;
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out vec3 binormal_interp;
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#endif
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#ifdef USE_MATERIAL_UNIFORMS
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layout(set = 2, 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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/* clang-format off */
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VERTEX_SHADER_GLOBALS
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/* clang-format on */
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// FIXME: This triggers a Mesa bug that breaks rendering, so disabled for now.
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// See GH-13450 and https://bugs.freedesktop.org/show_bug.cgi?id=100316
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//invariant gl_Position;
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void main() {
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vec3 vertex = vertex_attrib;
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mat4 world_matrix = instance_data.transform;
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mat3 world_normal_matrix= instance_data.normal_transform;
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vec3 normal = normal_attrib;
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#if defined(TANGENT_USED) || defined(NORMALMAP_USED) || defined(LIGHT_ANISOTROPY_USED)
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vec3 tangent = tangent_attrib.xyz;
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float binormalf = tangent_attrib.a;
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#endif
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#if defined(COLOR_USED)
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color_interp = color_attrib;
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#endif
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#if defined(TANGENT_USED) || defined(NORMALMAP_USED) || defined(LIGHT_ANISOTROPY_USED)
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vec3 binormal = normalize(cross(normal, tangent) * binormalf);
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#endif
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#if defined(UV_USED)
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uv_interp = uv_attrib;
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#endif
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#if defined(UV2_USED) || defined(USE_LIGHTMAP)
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uv2_interp = uv2_attrib;
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#endif
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#ifdef USE_OVERRIDE_POSITION
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vec4 position;
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#endif
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vec4 instance_custom = vec4(0.0);
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mat4 projection_matrix = scene_data.projection_matrix;
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//using world coordinates
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#if !defined(SKIP_TRANSFORM_USED) && defined(VERTEX_WORLD_COORDS_USED)
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vertex = (world_matrix * vec4(vertex,1.0)).xyz;
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normal = world_normal_matrix * normal;
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#if defined(TANGENT_USED) || defined(NORMALMAP_USED) || defined(LIGHT_ANISOTROPY_USED)
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tangent = world_normal_matrix * tangent;
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binormal = world_normal_matrix * binormal;
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#endif
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#endif
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float roughness = 1.0;
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mat4 modelview = scene_data.inv_camera_matrix * instance_data.transform;
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mat3 modelview_normal = mat3(scene_data.inv_camera_matrix) * instance_data.normal_transform;
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{
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/* clang-format off */
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VERTEX_SHADER_CODE
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/* clang-format on */
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}
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// using local coordinates (default)
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#if !defined(SKIP_TRANSFORM_USED) && !defined(VERTEX_WORLD_COORDS_USED)
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vertex = (modelview * vec4(vertex,1.0)).xyz;
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normal = modelview_normal * normal;
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#endif
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#if defined(TANGENT_USED) || defined(NORMALMAP_USED) || defined(LIGHT_ANISOTROPY_USED)
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binormal = modelview_normal * binormal;
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tangent = modelview_normal * tangent;
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#endif
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#endif
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//using world coordinates
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#if !defined(SKIP_TRANSFORM_USED) && defined(VERTEX_WORLD_COORDS_USED)
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vertex = (scene_data.inv_camera_matrix * vec4(vertex,1.0)).xyz;
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normal = mat3(scene_data.inverse_normal_matrix) * normal;
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#if defined(TANGENT_USED) || defined(NORMALMAP_USED) || defined(LIGHT_ANISOTROPY_USED)
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binormal = mat3(scene_data.camera_inverse_binormal_matrix) * binormal;
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tangent = mat3(scene_data.camera_inverse_tangent_matrix) * tangent;
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#endif
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#endif
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vertex_interp = vertex;
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normal_interp = normal;
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#if defined(TANGENT_USED) || defined(NORMALMAP_USED) || defined(LIGHT_ANISOTROPY_USED)
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tangent_interp = tangent;
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binormal_interp = binormal;
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#endif
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#ifdef MODE_RENDER_DEPTH
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float z_ofs = scene_data.z_offset;
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z_ofs += (1.0 - abs(normal_interp.z)) * scene_data.z_slope_scale;
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vertex_interp.z -= z_ofs;
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#endif //MODE_RENDER_DEPTH
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#ifdef USE_OVERRIDE_POSITION
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gl_Position = position;
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#else
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gl_Position = projection_matrix * vec4(vertex_interp, 1.0);
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#endif
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}
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/* clang-format off */
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[fragment]
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/* clang-format on */
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#version 450
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/* clang-format off */
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VERSION_DEFINES
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/* clang-format on */
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/* Varyings */
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#if defined(COLOR_USED)
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in vec4 color_interp;
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#endif
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#if defined(UV_USED)
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in vec2 uv_interp;
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#endif
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#if defined(UV2_USED) || defined(USE_LIGHTMAP)
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in vec2 uv2_interp;
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#endif
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#if defined(TANGENT_USED) || defined(NORMALMAP_USED) || defined(LIGHT_ANISOTROPY_USED)
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in vec3 tangent_interp;
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in vec3 binormal_interp;
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#endif
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in highp vec3 vertex_interp;
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in vec3 normal_interp;
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//defines to keep compatibility with vertex
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#define world_matrix instance_data.transform;
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#define world_normal_matrix instance_data.normal_transform;
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#define projection_matrix scene_data.projection_matrix;
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#ifdef USE_MATERIAL_UNIFORMS
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layout(set = 2, 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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/* clang-format off */
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FRAGMENT_SHADER_GLOBALS
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/* clang-format on */
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#ifdef MODE_MULTIPLE_RENDER_TARGETS
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layout(location = 0) out vec4 diffuse_buffer; //diffuse (rgb) and roughness
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layout(location = 1) out vec4 specular_buffer; //specular and SSS (subsurface scatter)
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#else
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layout(location = 0) out vec4 frag_color;
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#endif
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// This returns the G_GGX function divided by 2 cos_theta_m, where in practice cos_theta_m is either N.L or N.V.
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// We're dividing this factor off because the overall term we'll end up looks like
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// (see, for example, the first unnumbered equation in B. Burley, "Physically Based Shading at Disney", SIGGRAPH 2012):
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//
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// F(L.V) D(N.H) G(N.L) G(N.V) / (4 N.L N.V)
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//
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// We're basically regouping this as
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//
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// F(L.V) D(N.H) [G(N.L)/(2 N.L)] [G(N.V) / (2 N.V)]
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//
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// and thus, this function implements the [G(N.m)/(2 N.m)] part with m = L or V.
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//
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// The contents of the D and G (G1) functions (GGX) are taken from
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// E. Heitz, "Understanding the Masking-Shadowing Function in Microfacet-Based BRDFs", J. Comp. Graph. Tech. 3 (2) (2014).
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// Eqns 71-72 and 85-86 (see also Eqns 43 and 80).
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float G_GGX_2cos(float cos_theta_m, float alpha) {
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// Schlick's approximation
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// C. Schlick, "An Inexpensive BRDF Model for Physically-based Rendering", Computer Graphics Forum. 13 (3): 233 (1994)
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// Eq. (19), although see Heitz (2014) the about the problems with his derivation.
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// It nevertheless approximates GGX well with k = alpha/2.
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float k = 0.5 * alpha;
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return 0.5 / (cos_theta_m * (1.0 - k) + k);
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// float cos2 = cos_theta_m * cos_theta_m;
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// float sin2 = (1.0 - cos2);
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// return 1.0 / (cos_theta_m + sqrt(cos2 + alpha * alpha * sin2));
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}
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float D_GGX(float cos_theta_m, float alpha) {
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float alpha2 = alpha * alpha;
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float d = 1.0 + (alpha2 - 1.0) * cos_theta_m * cos_theta_m;
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return alpha2 / (M_PI * d * d);
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}
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float G_GGX_anisotropic_2cos(float cos_theta_m, float alpha_x, float alpha_y, float cos_phi, float sin_phi) {
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float cos2 = cos_theta_m * cos_theta_m;
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float sin2 = (1.0 - cos2);
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float s_x = alpha_x * cos_phi;
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float s_y = alpha_y * sin_phi;
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return 1.0 / max(cos_theta_m + sqrt(cos2 + (s_x * s_x + s_y * s_y) * sin2), 0.001);
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}
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float D_GGX_anisotropic(float cos_theta_m, float alpha_x, float alpha_y, float cos_phi, float sin_phi) {
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float cos2 = cos_theta_m * cos_theta_m;
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float sin2 = (1.0 - cos2);
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float r_x = cos_phi / alpha_x;
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float r_y = sin_phi / alpha_y;
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float d = cos2 + sin2 * (r_x * r_x + r_y * r_y);
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return 1.0 / max(M_PI * alpha_x * alpha_y * d * d, 0.001);
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}
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float SchlickFresnel(float u) {
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float m = 1.0 - u;
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float m2 = m * m;
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return m2 * m2 * m; // pow(m,5)
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}
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float GTR1(float NdotH, float a) {
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if (a >= 1.0) return 1.0 / M_PI;
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float a2 = a * a;
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float t = 1.0 + (a2 - 1.0) * NdotH * NdotH;
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return (a2 - 1.0) / (M_PI * log(a2) * t);
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}
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vec3 F0(float metallic, float specular, vec3 albedo) {
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float dielectric = 0.16 * specular * specular;
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// use albedo * metallic as colored specular reflectance at 0 angle for metallic materials;
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// see https://google.github.io/filament/Filament.md.html
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return mix(vec3(dielectric), albedo, vec3(metallic));
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}
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void light_compute(vec3 N, vec3 L, vec3 V, vec3 B, vec3 T, vec3 light_color, vec3 attenuation, vec3 diffuse_color, vec3 transmission, float specular_blob_intensity, float roughness, float metallic, float specular, float rim, float rim_tint, float clearcoat, float clearcoat_gloss, float anisotropy, inout vec3 diffuse_light, inout vec3 specular_light, inout float alpha) {
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#if defined(USE_LIGHT_SHADER_CODE)
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// light is written by the light shader
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vec3 normal = N;
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vec3 albedo = diffuse_color;
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vec3 light = L;
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vec3 view = V;
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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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#else
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float NdotL = dot(N, L);
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float cNdotL = max(NdotL, 0.0); // clamped NdotL
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float NdotV = dot(N, V);
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float cNdotV = max(NdotV, 0.0);
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#if defined(DIFFUSE_BURLEY) || defined(SPECULAR_BLINN) || defined(SPECULAR_SCHLICK_GGX) || defined(LIGHT_USE_CLEARCOAT)
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vec3 H = normalize(V + L);
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#endif
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#if defined(SPECULAR_BLINN) || defined(SPECULAR_SCHLICK_GGX) || defined(LIGHT_USE_CLEARCOAT)
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float cNdotH = max(dot(N, H), 0.0);
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#endif
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#if defined(DIFFUSE_BURLEY) || defined(SPECULAR_SCHLICK_GGX) || defined(LIGHT_USE_CLEARCOAT)
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float cLdotH = max(dot(L, H), 0.0);
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#endif
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if (metallic < 1.0) {
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#if defined(DIFFUSE_OREN_NAYAR)
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vec3 diffuse_brdf_NL;
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#else
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float diffuse_brdf_NL; // BRDF times N.L for calculating diffuse radiance
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#endif
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#if defined(DIFFUSE_LAMBERT_WRAP)
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// energy conserving lambert wrap shader
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diffuse_brdf_NL = max(0.0, (NdotL + roughness) / ((1.0 + roughness) * (1.0 + roughness)));
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#elif defined(DIFFUSE_OREN_NAYAR)
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{
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// see http://mimosa-pudica.net/improved-oren-nayar.html
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float LdotV = dot(L, V);
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float s = LdotV - NdotL * NdotV;
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float t = mix(1.0, max(NdotL, NdotV), step(0.0, s));
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float sigma2 = roughness * roughness; // TODO: this needs checking
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vec3 A = 1.0 + sigma2 * (-0.5 / (sigma2 + 0.33) + 0.17 * diffuse_color / (sigma2 + 0.13));
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float B = 0.45 * sigma2 / (sigma2 + 0.09);
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diffuse_brdf_NL = cNdotL * (A + vec3(B) * s / t) * (1.0 / M_PI);
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}
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#elif defined(DIFFUSE_TOON)
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diffuse_brdf_NL = smoothstep(-roughness, max(roughness, 0.01), NdotL);
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#elif defined(DIFFUSE_BURLEY)
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{
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float FD90_minus_1 = 2.0 * cLdotH * cLdotH * roughness - 0.5;
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float FdV = 1.0 + FD90_minus_1 * SchlickFresnel(cNdotV);
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float FdL = 1.0 + FD90_minus_1 * SchlickFresnel(cNdotL);
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diffuse_brdf_NL = (1.0 / M_PI) * FdV * FdL * cNdotL;
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/*
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float energyBias = mix(roughness, 0.0, 0.5);
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float energyFactor = mix(roughness, 1.0, 1.0 / 1.51);
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float fd90 = energyBias + 2.0 * VoH * VoH * roughness;
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float f0 = 1.0;
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float lightScatter = f0 + (fd90 - f0) * pow(1.0 - cNdotL, 5.0);
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float viewScatter = f0 + (fd90 - f0) * pow(1.0 - cNdotV, 5.0);
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diffuse_brdf_NL = lightScatter * viewScatter * energyFactor;
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*/
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}
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#else
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// lambert
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diffuse_brdf_NL = cNdotL * (1.0 / M_PI);
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#endif
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diffuse_light += light_color * diffuse_color * diffuse_brdf_NL * attenuation;
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#if defined(TRANSMISSION_USED)
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diffuse_light += light_color * diffuse_color * (vec3(1.0 / M_PI) - diffuse_brdf_NL) * transmission * attenuation;
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#endif
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#if defined(LIGHT_USE_RIM)
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float rim_light = pow(max(0.0, 1.0 - cNdotV), max(0.0, (1.0 - roughness) * 16.0));
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diffuse_light += rim_light * rim * mix(vec3(1.0), diffuse_color, rim_tint) * light_color;
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#endif
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}
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if (roughness > 0.0) { // FIXME: roughness == 0 should not disable specular light entirely
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// D
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#if defined(SPECULAR_BLINN)
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//normalized blinn
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float shininess = exp2(15.0 * (1.0 - roughness) + 1.0) * 0.25;
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float blinn = pow(cNdotH, shininess);
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blinn *= (shininess + 8.0) * (1.0 / (8.0 * M_PI));
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float intensity = (blinn) / max(4.0 * cNdotV * cNdotL, 0.75);
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specular_light += light_color * intensity * specular_blob_intensity * attenuation;
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#elif defined(SPECULAR_PHONG)
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vec3 R = normalize(-reflect(L, N));
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float cRdotV = max(0.0, dot(R, V));
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float shininess = exp2(15.0 * (1.0 - roughness) + 1.0) * 0.25;
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float phong = pow(cRdotV, shininess);
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phong *= (shininess + 8.0) * (1.0 / (8.0 * M_PI));
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float intensity = (phong) / max(4.0 * cNdotV * cNdotL, 0.75);
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specular_light += light_color * intensity * specular_blob_intensity * attenuation;
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#elif defined(SPECULAR_TOON)
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vec3 R = normalize(-reflect(L, N));
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float RdotV = dot(R, V);
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float mid = 1.0 - roughness;
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mid *= mid;
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float intensity = smoothstep(mid - roughness * 0.5, mid + roughness * 0.5, RdotV) * mid;
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diffuse_light += light_color * intensity * specular_blob_intensity * attenuation; // write to diffuse_light, as in toon shading you generally want no reflection
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#elif defined(SPECULAR_DISABLED)
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// none..
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#elif defined(SPECULAR_SCHLICK_GGX)
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// shlick+ggx as default
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#if defined(LIGHT_ANISOTROPY_USED)
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float alpha_ggx = roughness * roughness;
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float aspect = sqrt(1.0 - anisotropy * 0.9);
|
|
float ax = alpha_ggx / aspect;
|
|
float ay = alpha_ggx * aspect;
|
|
float XdotH = dot(T, H);
|
|
float YdotH = dot(B, H);
|
|
float D = D_GGX_anisotropic(cNdotH, ax, ay, XdotH, YdotH);
|
|
float G = G_GGX_anisotropic_2cos(cNdotL, ax, ay, XdotH, YdotH) * G_GGX_anisotropic_2cos(cNdotV, ax, ay, XdotH, YdotH);
|
|
|
|
#else
|
|
float alpha_ggx = roughness * roughness;
|
|
float D = D_GGX(cNdotH, alpha_ggx);
|
|
float G = G_GGX_2cos(cNdotL, alpha_ggx) * G_GGX_2cos(cNdotV, alpha_ggx);
|
|
#endif
|
|
// F
|
|
vec3 f0 = F0(metallic, specular, diffuse_color);
|
|
float cLdotH5 = SchlickFresnel(cLdotH);
|
|
vec3 F = mix(vec3(cLdotH5), vec3(1.0), f0);
|
|
|
|
vec3 specular_brdf_NL = cNdotL * D * F * G;
|
|
|
|
specular_light += specular_brdf_NL * light_color * specular_blob_intensity * attenuation;
|
|
#endif
|
|
|
|
#if defined(LIGHT_USE_CLEARCOAT)
|
|
|
|
#if !defined(SPECULAR_SCHLICK_GGX)
|
|
float cLdotH5 = SchlickFresnel(cLdotH);
|
|
#endif
|
|
float Dr = GTR1(cNdotH, mix(.1, .001, clearcoat_gloss));
|
|
float Fr = mix(.04, 1.0, cLdotH5);
|
|
float Gr = G_GGX_2cos(cNdotL, .25) * G_GGX_2cos(cNdotV, .25);
|
|
|
|
float clearcoat_specular_brdf_NL = 0.25 * clearcoat * Gr * Fr * Dr * cNdotL;
|
|
|
|
specular_light += clearcoat_specular_brdf_NL * light_color * specular_blob_intensity * attenuation;
|
|
#endif
|
|
}
|
|
|
|
#ifdef USE_SHADOW_TO_OPACITY
|
|
alpha = min(alpha, clamp(1.0 - length(attenuation), 0.0, 1.0));
|
|
#endif
|
|
|
|
#endif //defined(USE_LIGHT_SHADER_CODE)
|
|
}
|
|
|
|
|
|
void main() {
|
|
|
|
|
|
//lay out everything, whathever is unused is optimized away anyway
|
|
vec3 vertex = vertex_interp;
|
|
vec3 view = -normalize(vertex_interp);
|
|
vec3 albedo = vec3(1.0);
|
|
vec3 transmission = vec3(0.0);
|
|
float metallic = 0.0;
|
|
float specular = 0.5;
|
|
vec3 emission = vec3(0.0);
|
|
float roughness = 1.0;
|
|
float rim = 0.0;
|
|
float rim_tint = 0.0;
|
|
float clearcoat = 0.0;
|
|
float clearcoat_gloss = 0.0;
|
|
float anisotropy = 0.0;
|
|
vec2 anisotropy_flow = vec2(1.0, 0.0);
|
|
|
|
#if defined(ENABLE_AO)
|
|
float ao = 1.0;
|
|
float ao_light_affect = 0.0;
|
|
#endif
|
|
|
|
float alpha = 1.0;
|
|
|
|
#if defined(ALPHA_SCISSOR_USED)
|
|
float alpha_scissor = 0.5;
|
|
#endif
|
|
|
|
#if defined(TANGENT_USED) || defined(NORMALMAP_USED) || defined(LIGHT_ANISOTROPY_USED)
|
|
vec3 binormal = normalize(binormal_interp);
|
|
vec3 tangent = normalize(tangent_interp);
|
|
#else
|
|
vec3 binormal = vec3(0.0);
|
|
vec3 tangent = vec3(0.0);
|
|
#endif
|
|
vec3 normal = normalize(normal_interp);
|
|
|
|
#if defined(DO_SIDE_CHECK)
|
|
if (!gl_FrontFacing) {
|
|
normal = -normal;
|
|
}
|
|
#endif
|
|
|
|
#if defined(UV_USED)
|
|
vec2 uv = uv_interp;
|
|
#endif
|
|
|
|
#if defined(UV2_USED) || defined(USE_LIGHTMAP)
|
|
vec2 uv2 = uv2_interp;
|
|
#endif
|
|
|
|
#if defined(COLOR_USED)
|
|
vec4 color = color_interp;
|
|
#endif
|
|
|
|
#if defined(NORMALMAP_USED)
|
|
|
|
vec3 normalmap = vec3(0.5);
|
|
#endif
|
|
|
|
float normaldepth = 1.0;
|
|
|
|
#if defined(SCREEN_UV_USED)
|
|
vec2 screen_uv = gl_FragCoord.xy * screen_pixel_size;
|
|
#endif
|
|
|
|
#if defined(SSS_USED)
|
|
float sss_strength = 0.0;
|
|
#endif
|
|
|
|
#define
|
|
{
|
|
/* clang-format off */
|
|
|
|
FRAGMENT_SHADER_CODE
|
|
|
|
/* clang-format on */
|
|
}
|
|
|
|
#if !defined(USE_SHADOW_TO_OPACITY)
|
|
|
|
#if defined(ALPHA_SCISSOR_USED)
|
|
if (alpha < alpha_scissor) {
|
|
discard;
|
|
}
|
|
#endif // ALPHA_SCISSOR_USED
|
|
|
|
#ifdef USE_OPAQUE_PREPASS
|
|
|
|
if (alpha < opaque_prepass_threshold) {
|
|
discard;
|
|
}
|
|
|
|
#endif // USE_OPAQUE_PREPASS
|
|
|
|
#endif // !USE_SHADOW_TO_OPACITY
|
|
|
|
#if defined(NORMALMAP_USED)
|
|
|
|
normalmap.xy = normalmap.xy * 2.0 - 1.0;
|
|
normalmap.z = sqrt(max(0.0, 1.0 - dot(normalmap.xy, normalmap.xy))); //always ignore Z, as it can be RG packed, Z may be pos/neg, etc.
|
|
|
|
normal = normalize(mix(normal, tangent * normalmap.x + binormal * normalmap.y + normal * normalmap.z, normaldepth));
|
|
|
|
#endif
|
|
|
|
#if defined(LIGHT_ANISOTROPY_USED)
|
|
|
|
if (anisotropy > 0.01) {
|
|
//rotation matrix
|
|
mat3 rot = mat3(tangent, binormal, normal);
|
|
//make local to space
|
|
tangent = normalize(rot * vec3(anisotropy_flow.x, anisotropy_flow.y, 0.0));
|
|
binormal = normalize(rot * vec3(-anisotropy_flow.y, anisotropy_flow.x, 0.0));
|
|
}
|
|
|
|
#endif
|
|
|
|
#ifdef ENABLE_CLIP_ALPHA
|
|
if (albedo.a < 0.99) {
|
|
//used for doublepass and shadowmapping
|
|
discard;
|
|
}
|
|
#endif
|
|
|
|
/////////////////////// LIGHTING //////////////////////////////
|
|
|
|
//apply energy conservation
|
|
|
|
vec3 specular_light = vec3(0.0, 0.0, 0.0);
|
|
vec3 diffuse_light = vec3(0.0, 0.0, 0.0);
|
|
vec3 ambient_light = vec3( 0.0, 0.0, 0.0);
|
|
|
|
//radiance
|
|
|
|
float specular_blob_intensity = 1.0;
|
|
|
|
#if defined(SPECULAR_TOON)
|
|
specular_blob_intensity *= specular * 2.0;
|
|
#endif
|
|
|
|
//gi probes
|
|
|
|
//lightmap
|
|
|
|
//lightmap capture
|
|
|
|
//process reflections
|
|
|
|
{
|
|
|
|
#if defined(DIFFUSE_TOON)
|
|
//simplify for toon, as
|
|
specular_light *= specular * metallic * albedo * 2.0;
|
|
#else
|
|
|
|
// scales the specular reflections, needs to be be computed before lighting happens,
|
|
// but after environment, GI, and reflection probes are added
|
|
// Environment brdf approximation (Lazarov 2013)
|
|
// see https://www.unrealengine.com/en-US/blog/physically-based-shading-on-mobile
|
|
const vec4 c0 = vec4(-1.0, -0.0275, -0.572, 0.022);
|
|
const vec4 c1 = vec4(1.0, 0.0425, 1.04, -0.04);
|
|
vec4 r = roughness * c0 + c1;
|
|
float ndotv = clamp(dot(normal, eye_vec), 0.0, 1.0);
|
|
float a004 = min(r.x * r.x, exp2(-9.28 * ndotv)) * r.x + r.y;
|
|
vec2 env = vec2(-1.04, 1.04) * a004 + r.zw;
|
|
|
|
vec3 f0 = F0(metallic, specular, albedo);
|
|
specular_light *= env.x * f0 + env.y;
|
|
#endif
|
|
}
|
|
|
|
//directional light
|
|
|
|
|
|
//process omni and spots
|
|
|
|
#ifdef USE_SHADOW_TO_OPACITY
|
|
alpha = min(alpha, clamp(length(ambient_light), 0.0, 1.0));
|
|
|
|
#if defined(ALPHA_SCISSOR_USED)
|
|
if (alpha < alpha_scissor) {
|
|
discard;
|
|
}
|
|
#endif // ALPHA_SCISSOR_USED
|
|
|
|
#ifdef USE_OPAQUE_PREPASS
|
|
|
|
if (alpha < opaque_prepass_threshold) {
|
|
discard;
|
|
}
|
|
|
|
#endif // USE_OPAQUE_PREPASS
|
|
|
|
#endif // USE_SHADOW_TO_OPACITY
|
|
|
|
|
|
#ifdef MODE_RENDER_DEPTH
|
|
//nothing happens, so a tree-ssa optimizer will result in no fragment shader :)
|
|
#else
|
|
|
|
specular_light *= reflection_multiplier;
|
|
ambient_light *= albedo; //ambient must be multiplied by albedo at the end
|
|
|
|
#if defined(ENABLE_AO)
|
|
ambient_light *= ao;
|
|
ao_light_affect = mix(1.0, ao, ao_light_affect);
|
|
specular_light *= ao_light_affect;
|
|
diffuse_light *= ao_light_affect;
|
|
#endif
|
|
|
|
// base color remapping
|
|
diffuse_light *= 1.0 - metallic; // TODO: avoid all diffuse and ambient light calculations when metallic == 1 up to this point
|
|
ambient_light *= 1.0 - metallic;
|
|
|
|
//fog
|
|
|
|
#ifdef MODE_MULTIPLE_RENDER_TARGETS
|
|
|
|
#ifdef USE_NO_SHADING
|
|
diffuse_buffer = vec4(albedo.rgb, 0.0);
|
|
specular_buffer = vec4(0.0);
|
|
|
|
#else
|
|
|
|
diffuse_buffer = vec4(emission + diffuse_light + ambient_light, sss_strenght);
|
|
specular_buffer = vec4(specular_light, metallic);
|
|
|
|
#endif
|
|
|
|
#else //MODE_MULTIPLE_RENDER_TARGETS
|
|
|
|
#ifdef USE_NO_SHADING
|
|
frag_color = vec4(albedo, alpha);
|
|
#else
|
|
frag_color = vec4(emission + ambient_light + diffuse_light + specular_light, alpha);
|
|
|
|
#endif //USE_NO_SHADING
|
|
|
|
#endif //MODE_MULTIPLE_RENDER_TARGETS
|
|
|
|
#endif //MODE_RENDER_DEPTH
|
|
}
|