SuperTuxKart 1.5 upstream source (from official release tarball)

data/shaders/ge_shaders/displace_transparent.frag

@@ -0,0 +1,48 @@
+layout(location = 0) in vec4 f_vertex_color;
+layout(location = 1) in vec2 f_uv;
+layout(location = 3) flat in int f_material_id;
+
+layout(location = 0) out vec4 o_color;
+
+layout(push_constant) uniform Constants
+{
+    vec4 m_displace_direction;
+} u_push_constants;
+
+#include "utils/camera.glsl"
+#include "utils/constants_utils.glsl"
+#include "utils/sample_mesh_texture.glsl"
+#include "../utils/displace_utils.frag"
+
+layout (set = 3, binding = 0) uniform sampler2D u_displace_mask;
+layout (set = 3, binding = 1) uniform sampler2D u_displace_ssr;
+
+void main()
+{
+#ifdef PBR_ENABLED
+    vec4 color = sampleMeshTexture0(f_material_id, f_uv) * f_vertex_color;
+    vec3 mixed_color = color.xyz;
+    float alpha = color.w;
+    mixed_color = convertColor(mixed_color);
+    if (u_ssr)
+    {
+        float alpha = sampleMeshTexture0(f_material_id, f_uv).a;
+        if (alpha == 0.0)
+        {
+            o_color = vec4(mixed_color * alpha, alpha);
+            return;
+        }
+        float horiz = sampleMeshTexture2(f_material_id, f_uv + u_push_constants.m_displace_direction.xy * 150.).x;
+        float vert = sampleMeshTexture2(f_material_id, (f_uv.yx + u_push_constants.m_displace_direction.zw * 150.) * vec2(0.9)).x;
+        vec2 shift = getDisplaceShift(horiz, vert);
+        ivec2 uv = getDisplaceUV(shift, u_camera.m_viewport, u_displace_mask);
+        vec3 reflection = texelFetch(u_displace_ssr, uv, 0).xyz;
+        o_color = vec4(mixed_color * alpha * 0.5 + reflection * alpha * 0.5 ,
+            alpha);
+    }
+    else
+    {
+        o_color = vec4(mixed_color * alpha, alpha);
+    }
+#endif
+}