SuperTuxKart 1.5 upstream source (from official release tarball)

data/shaders/pointlight.frag

@@ -0,0 +1,70 @@
+uniform sampler2D ntex;
+#if defined(GL_ES) && defined(GL_FRAGMENT_PRECISION_HIGH)
+uniform highp sampler2D dtex;
+#else
+uniform sampler2D dtex;
+#endif
+
+flat in vec3 center;
+flat in float energy;
+flat in vec3 col;
+flat in float radius;
+flat in vec4 direction_scale_offset;
+
+#ifdef GL_ES
+layout (location = 0) out vec4 Diff;
+layout (location = 1) out vec4 Spec;
+#else
+out vec4 Diff;
+out vec4 Spec;
+#endif
+
+#stk_include "utils/decodeNormal.frag"
+#stk_include "utils/SpecularBRDF.frag"
+#stk_include "utils/DiffuseBRDF.frag"
+#stk_include "utils/getPosFromUVDepth.frag"
+
+void main()
+{
+    vec2 texc = gl_FragCoord.xy / u_screen;
+    float z = texture(dtex, texc).x;
+    vec3 norm = (u_view_matrix * vec4(DecodeNormal(texture(ntex, texc).xy), 0)).xyz;
+    float roughness = texture(ntex, texc).z;
+
+    vec4 xpos = getPosFromUVDepth(vec3(texc, z), u_inverse_projection_matrix);
+    vec3 eyedir = -normalize(xpos.xyz);
+
+    vec4 pseudocenter = u_view_matrix * vec4(center.xyz, 1.0);
+    pseudocenter /= pseudocenter.w;
+    vec3 light_pos = pseudocenter.xyz;
+    vec3 light_col = col.xyz;
+    vec3 light_to_frag = light_pos - xpos.xyz;
+    float d = length(light_to_frag);
+    float att = energy * 20. / (1. + d * d);
+    att *= (radius - d) / radius;
+    if (att <= 0.) discard;
+
+    // Light Direction
+    vec3 L = light_to_frag / d;
+    // Spotlight
+    float sscale = direction_scale_offset.z;
+    if (sscale != 0.)
+    {
+        vec3 sdir = vec3(direction_scale_offset.xy, 0.);
+        sdir.z = sqrt(1. - dot(sdir, sdir)) * sign(sscale);
+        sdir = (u_view_matrix * vec4(sdir, 0.0)).xyz;
+        float offset = direction_scale_offset.w;
+        float sattenuation = clamp(dot(-sdir, L) *
+            abs(sscale) + offset, 0.0, 1.0);
+        if (sattenuation == 0.)
+            discard;
+        att *= sattenuation * sattenuation;
+    }
+
+    float NdotL = clamp(dot(norm, L), 0., 1.);
+    vec3 Specular = SpecularBRDF(norm, eyedir, L, vec3(1.), roughness);
+    vec3 Diffuse = DiffuseBRDF(norm, eyedir, L, vec3(1.), roughness);
+
+    Diff = vec4(Diffuse * NdotL * light_col * att, 1.);
+    Spec = vec4(Specular * NdotL * light_col * att, 1.);
+}