shaders: Implement GLSL shaders for lessons 2-9

src/shaders/lesson3.glsl

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+/*
+ * SPDX-FileCopyrightText: (C) 2025 a dinosaur
+ * SPDX-License-Identifier: Zlib
+ */
+
+#version 450
+
+#ifdef VERTEX
+
+layout(location = 0) in vec3 i_position;
+layout(location = 1) in vec4 i_color;
+
+layout(location = 0) out vec4 v_color;
+
+layout(set = 1, binding = 0) uniform UBO
+{
+	mat4 u_viewproj;
+};
+
+void main()
+{
+	v_color = i_color;
+	gl_Position = u_viewproj * vec4(i_position, 1.0);
+}
+
+#else
+
+layout(location = 0) in vec4 v_color;
+
+layout(location = 0) out vec4 o_color;
+
+void main()
+{
+	o_color = v_color;
+}
+
+#endif