Implement basic fixed point light source and phong shading

This patch places a single point light source in the scene and
implements view-space phong shading around it. This is in preparation
for texture values being fed in from a set of textures.

1 files changed, 11 insertions, 3 deletions

diff --git a/vert.glsl b/vert.glsl
index d33cc47..5e4e43a 100644
--- a/vert.glsl
+++ b/vert.glsl
@@ -2,16 +2,24 @@
 // SPDX-License-Identifier: MIT
 #version 330 core
 layout (location = 0) in vec3 pos;
-layout (location = 1) in vec3 normal;
+layout (location = 1) in vec3 norm;
 layout (location = 2) in vec2 uv;
 
-out vec3 vcolor;
+out vec3 vnorm;
+out vec3 fpos;
+out vec3 lipos;
+
 uniform mat4 model;
 uniform mat4 view;
 uniform mat4 proj;
 
 void main()
 {
+	vec3 light = { 1.2, 1.0, 2.0 };
+
 	gl_Position = proj * view * model * vec4(pos, 1.0);
-	vcolor = normal;
+	fpos = vec3(view * model * vec4(pos, 1.0));
+	// TODO: Try to work out how to only do this ONCE in C or see if it matters
+	vnorm = mat3(transpose(inverse(view * model))) * norm;
+	lipos = vec3(view * vec4(light, 1.0));
 }