1 files changed, 24 insertions, 0 deletions
diff --git a/source/blender/gpu/shaders/gpu_shader_3D_lamp_vert.glsl b/source/blender/gpu/shaders/gpu_shader_3D_lamp_vert.glsl
new file mode 100644
index 00000000000..dbc683ef42b
--- /dev/null
+++ b/source/blender/gpu/shaders/gpu_shader_3D_lamp_vert.glsl
@@ -0,0 +1,24 @@
+
+uniform mat4 ViewProjectionMatrix;
+uniform vec3 screen_vecs[2];
+uniform float size;
+uniform float pixel_size;
+
+in vec2 pos;
+in mat4 InstanceModelMatrix;
+
+#define lamp_pos InstanceModelMatrix[3].xyz
+
+float mul_project_m4_v3_zfac(in vec3 co)
+{
+	return (ViewProjectionMatrix[0][3] * co.x) +
+	       (ViewProjectionMatrix[1][3] * co.y) +
+	       (ViewProjectionMatrix[2][3] * co.z) + ViewProjectionMatrix[3][3];
+}
+
+void main()
+{
+	float pix_size = mul_project_m4_v3_zfac(lamp_pos) * pixel_size;
+	vec3 screen_pos = screen_vecs[0].xyz * pos.x + screen_vecs[1].xyz * pos.y;
+	gl_Position = ViewProjectionMatrix * vec4(lamp_pos + screen_pos * size * pix_size, 1.0);
+}