1 files changed, 44 insertions, 0 deletions
diff --git a/advanced_opengl/8.geometry_shader/shaders/explosion.gs b/advanced_opengl/8.geometry_shader/shaders/explosion.gs
new file mode 100644
index 0000000..1883ad2
--- /dev/null
+++ b/advanced_opengl/8.geometry_shader/shaders/explosion.gs
@@ -0,0 +1,44 @@
+#version 330 core
+layout(triangles) in;
+layout(triangle_strip, max_vertices = 3) out;
+
+in VS_OUT {
+    vec2 gtex_coords;
+} gs_in[];
+
+out vec2 ftex_coords;
+
+uniform float time;
+
+vec3
+get_normal(void)
+{
+    vec3 a = vec3(gl_in[0].gl_Position)-vec3(gl_in[1].gl_Position);
+    vec3 b = vec3(gl_in[2].gl_Position)-vec3(gl_in[1].gl_Position);
+    return(normalize(cross(a, b)));
+}
+
+vec4
+explode(vec4 position, vec3 normal)
+{
+    float magnitude = 0.2f;
+    vec3 direction = normal*magnitude*((sin(time)+1.0f)/2.0f);
+    vec4 result = position+vec4(direction, 0.0f);
+    return(result);
+}
+
+void
+main(void)
+{
+    vec3 normal = get_normal();
+    gl_Position = explode(gl_in[0].gl_Position, normal);
+    ftex_coords = gs_in[0].gtex_coords;
+    EmitVertex();
+    gl_Position = explode(gl_in[1].gl_Position, normal);
+    ftex_coords = gs_in[1].gtex_coords;
+    EmitVertex();
+    gl_Position = explode(gl_in[2].gl_Position, normal);
+    ftex_coords = gs_in[2].gtex_coords;
+    EmitVertex();
+    EndPrimitive();
+}