Add basic block textures

- Remove the code that sent colors through uniform variables, instead
  send texture data
- Each vertex now has a texture coordinate
- struct texture is a easy way to represent textures, can be extended
  later
- Shaders updated to use textures

1 files changed, 6 insertions, 3 deletions

diff --git a/shaders/fragment.glsl b/shaders/fragment.glsl
index e3bd9db..6222c27 100644
--- a/shaders/fragment.glsl
+++ b/shaders/fragment.glsl
@@ -4,12 +4,15 @@ uniform vec3 face_colors[6];
 uniform vec3 light_color;
 in vec3 normal;
 in vec3 frag_pos;
+in vec2 text_coord;
+uniform sampler2D block_texture;
 void main() {
     vec3 ambient_color = vec3(0.1);
     vec3 norm = normalize(normal);
-    vec3 light_dir = normalize(vec3(1.0f, 1.0f, 1.0f));
+    vec3 light_dir = normalize(vec3(1.0f, 2.0f, 1.0f));
     float diff = max(dot(norm, light_dir), 0.0);
     vec3 diffuse = diff * vec3(1.0);
-
-    frag_colour = vec4((ambient_color + diffuse) * face_colors[gl_PrimitiveID/2], 1.0);
+    vec4 final_texture = texture(block_texture, text_coord);
+    vec4 lighting = vec4(ambient_color + diffuse, 1.0f); 
+    frag_colour =  lighting * final_texture;
 };