tofu

commit 351966b66e633903957361d86dccfce913eb9cb2
parent d03896801b04be5ebe14f96bb21683fa705f5c9d
Author: Matsuda Kenji <info@mtkn.jp>
Date:   Sun, 10 Nov 2024 07:45:44 +0900

Phong lighting

Diffstat:
M
cmd/sample/fragment.glsl
 | 
16
+++++++++++++---
M
cmd/sample/main.go
 | 
1
+
M
cmd/sample/vertex.glsl
 | 
2
+-

3 files changed, 15 insertions(+), 4 deletions(-)
diff --git a/cmd/sample/fragment.glsl b/cmd/sample/fragment.glsl
@@ -3,14 +3,24 @@ in vec3 fnormal;
 in vec3 fpos;
 uniform vec3 lightCol;
 uniform vec3 lightPos;
+uniform vec3 camPos;
 uniform vec3 objCol;
 out vec4 fcol;
 void main() {
 	float ambientStrength = 0.1;
+	float specularStrength = 0;
+
 	vec3 ambient = ambientStrength * lightCol;
-	vec3 dir = normalize(lightPos - fpos);
-	float diff = max(dot(fnormal, dir), 0.0);
+
+	vec3 lightDir = normalize(lightPos - fpos);
+	float diff = max(dot(fnormal, lightDir), 0.0);
 	vec3 diffuse = diff * lightCol;
-	fcol = vec4(objCol * (ambient + diffuse), 1.0);
+
+	vec3 viewDir = normalize(camPos - fpos);
+	vec3 reflectDir = reflect(-lightDir, fnormal);
+	float spec = pow(max(dot(viewDir, reflectDir), 0.0), 32);
+	vec3 specular = specularStrength * spec * lightCol;
+
+	fcol = vec4(objCol * (ambient + diffuse + specular), 1.0);
 }
 
diff --git a/cmd/sample/main.go b/cmd/sample/main.go
@@ -220,6 +220,7 @@ func main() {
 		program.SetMat4("model", model)
 		program.SetVec3("lightCol", lightCol)
 		program.SetVec3("objCol", objCol)
+		program.SetVec3("camPos", camera.Pos)
 
 		gl.DrawElements(gl.TRIANGLES, 36, gl.UNSIGNED_INT, nil)
 		lightProgram.Use()
diff --git a/cmd/sample/vertex.glsl b/cmd/sample/vertex.glsl
@@ -8,7 +8,7 @@ out vec3 fnormal;
 out vec3 fpos;
 void main() {
 	gl_Position = projection * view * model * vec4(pos, 1.0);
-	fnormal = vec3(model * vec4(normal, 1.0));
+	fnormal = mat3(transpose(inverse(model))) * normal;
 	fpos = vec3(model * vec4(pos, 1.0));
 }