SuperTuxKart 1.5 upstream source (from official release tarball)

data/shaders/sp_displace.frag

@@ -0,0 +1,36 @@
+uniform sampler2D displacement_tex;
+uniform sampler2D mask_tex;
+uniform sampler2D color_tex;
+uniform sampler2D ssr_tex;
+
+#stk_include "utils/displace_utils.frag"
+#stk_include "utils/sp_texture_sampling.frag"
+
+uniform vec4 direction;
+uniform int u_ssr;
+
+in vec2 uv;
+
+out vec4 o_diffuse_color;
+
+void main()
+{
+    float horiz = texture(displacement_tex, uv + direction.xy * 150.).x;
+    float vert = texture(displacement_tex, (uv.yx + direction.zw * 150.) * vec2(0.9)).x;
+    vec2 shift = getDisplaceShift(horiz, vert);
+    shift *= 0.02;
+
+    vec2 tc = gl_FragCoord.xy / u_screen;
+    float mask = texture(mask_tex, tc + shift).x;
+    tc += (mask < 1.) ? vec2(0.) : shift;
+
+    vec4 blend_tex = sampleTextureLayer0(uv);
+    vec3 col = blend_tex.rgb * blend_tex.a;
+    if (u_ssr == 1)
+    {
+        col.rgb *= 0.7;
+        col.rgb += texture(ssr_tex, tc).rgb * blend_tex.a * 0.3;
+    }
+    col.rgb += (1. - blend_tex.a) * texture(color_tex, tc).rgb;
+    o_diffuse_color = vec4(col.rgb, 1.);
+}