1 files changed, 28 insertions, 0 deletions

diff --git a/shaders/view_normal_mapped_normals.frag b/shaders/view_normal_mapped_normals.frag
new file mode 100644
index 0000000..a372c02
--- /dev/null
+++ b/shaders/view_normal_mapped_normals.frag
@@ -0,0 +1,28 @@
+precision highp float;
+
+uniform sampler2D NormalMap;
+
+in vec3 Normal;
+in vec4 Tangent;
+in vec3 Bitangent; // TODO: Compute here or in PS?
+in vec2 Texcoord;
+
+out vec4 FragColour;
+
+// TODO: Move to "normal.h"
+vec3 get_vs_normal(vec3 normal, vec4 tangent, vec3 normalMapSample) {
+  vec3 N = normal;
+  // vec3 T = normalize(interpTangent   - dot(tangent, N)*N);
+  // vec3 B = normalize(interpBitangent - dot(interpTangent, N)*N - dot(interpTangent, T)*T);
+  vec3 T = tangent.xyz;
+  //vec3 B = tangent.w * cross(N,T);
+  vec3 B = Bitangent;
+  vec3 n = normalMapSample;
+  return normalize(n.x*T + n.y*B + n.z*N);
+}
+
+void main() {
+  vec3 normalMapSample = texture(NormalMap, Texcoord).xyz * 2.0 - 1.0;
+  vec3 N = get_vs_normal(Normal, Tangent, normalMapSample);
+  FragColour = vec4(pow(N, vec3(1.0 / 2.2)), 1.0);
+}