SuperTuxKart 1.5 upstream source (from official release tarball)

data/shaders/ge_shaders/deferred_pointlight.vert

@@ -0,0 +1,59 @@
+#include "utils/camera.glsl"
+#include "utils/global_light_data.glsl"
+#include "utils/spm_data.glsl"
+#include "../utils/get_world_location.vert"
+
+layout(push_constant) uniform Constants
+{
+    vec4 m_billboard_rotation;
+    int m_fullscreen_light;
+} u_push_constants;
+
+layout(location = 0) flat out int light_idx;
+
+const vec3 g_vertices[4] =
+    vec3[]
+    (
+        vec3( 1.0,  1.0, 0.0),
+        vec3( 1.0, -1.0, 0.0),
+        vec3(-1.0,  1.0, 0.0),
+        vec3(-1.0, -1.0, 0.0)
+    );
+
+void main()
+{
+    // Get the light index from the instance ID
+    light_idx = gl_InstanceIndex + u_push_constants.m_fullscreen_light;
+    LightData light = u_global_light.m_lights[light_idx];
+    vec4 pos_radius = light.m_position_radius;
+
+    // Get camera position from inverse view matrix
+    vec3 camera_pos = vec3(u_camera.m_inverse_view_matrix[3]);
+
+    // Calculate vector from light to camera
+    vec3 light_to_camera = normalize(camera_pos - pos_radius.xyz);
+
+    /* The lights which cover the whole screen have been rendered already
+    // Calculate distance from light to camera
+    float dist_to_camera = distance(camera_pos, pos_radius.xyz);
+
+    // If camera is within light radius, move the billboard quad towards the
+    // near plane
+    if (dist_to_camera < pos_radius.w)
+    {
+        gl_Position = vec4(g_vertices[gl_VertexIndex], 1.0);
+        return;
+    }
+    */
+
+    // Move the billboard towards camera by one radius unit
+    vec4 world_pos = getWorldPosition(
+        pos_radius.xyz + light_to_camera * pos_radius.w,
+        u_push_constants.m_billboard_rotation,
+        vec3(pos_radius.w), g_vertices[gl_VertexIndex]);
+    vec4 pv = u_camera.m_projection_view_matrix * world_pos;
+    if (pv.z < 0.0)
+        gl_Position = vec4(pv.xy, 0.0, 1.0);
+    else
+        gl_Position = pv;
+}