shaders: Implement GLSL shaders for lessons 2-9

src/shaders/lesson7.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 vec2 i_texcoord;
+layout(location = 2) in vec3 i_normal;
+
+layout(location = 0) out vec2 v_texcoord;
+layout(location = 1) out vec4 v_color;
+
+layout(set = 1, binding = 0) uniform UBO
+{
+	mat4 u_modelView;
+	mat4 u_projection;
+};
+
+layout(set = 1, binding = 1) uniform Light
+{
+	vec4 u_ambient;
+	vec4 u_diffuse;
+	vec4 u_position;
+};
+
+void main()
+{
+	const vec4 position = u_modelView * vec4(i_position, 1.0);
+	const vec3 normal = normalize(u_modelView * vec4(i_normal, 0.0)).xyz;
+
+	const vec3 lightVec = u_position.xyz - position.xyz;
+	const float lightDest2 = dot(lightVec, lightVec);
+	const vec3 dir = inversesqrt(lightDest2) * lightVec;
+	const float lambert = max(0.0, dot(normal, dir));
+
+	const vec3 ambient = 0.04 + 0.2 * u_ambient.rgb;
+	const vec3 diffuse = 0.8 * u_diffuse.rgb;
+
+	v_texcoord  = i_texcoord;
+	v_color     = vec4(ambient + lambert * diffuse, 1.0);
+	gl_Position = u_projection * position;
+}
+
+#else
+
+layout(location = 0) in vec2 v_texcoord;
+layout(location = 1) in vec4 v_color;
+
+layout(location = 0) out vec4 o_color;
+
+layout(set = 2, binding = 0) uniform sampler2D u_texture;
+
+void main()
+{
+	o_color = v_color * texture(u_texture, v_texcoord);
+}
+
+#endif