1 files changed, 37 insertions, 0 deletions
diff --git a/src/shader/code/geometry.glsl b/src/shader/code/geometry.glsl
new file mode 100644
index 0000000..6701b41
--- /dev/null
+++ b/src/shader/code/geometry.glsl
@@ -0,0 +1,37 @@
+static const std::string GEOMETRY_SHADER_CODE = R"(
+#version 430
+
+layout (points) in;
+layout (triangle_strip, max_vertices=4) out;
+
+uniform mat4 MVP;
+
+in VS_OUT {
+	vec3 color;
+} gs_in[];
+
+out vec3 color;
+
+vec4 project(vec4 v) {
+	return MVP * v;
+}
+
+void emitSquareAt(vec4 position) {
+	const float size = 0.2;
+
+	gl_Position = project(position + vec4(-size, -size, 0.0, 0.0));
+	EmitVertex();
+	gl_Position = project(position + vec4( size, -size, 0.0, 0.0));
+	EmitVertex();
+	gl_Position = project(position + vec4(-size,  size, 0.0, 0.0));
+	EmitVertex();
+	gl_Position = project(position + vec4( size,  size, 0.0, 0.0));
+	EmitVertex();
+}
+
+void main() {
+	color = gs_in[0].color;
+	emitSquareAt(gl_in[0].gl_Position);
+	EndPrimitive();
+}
+)";