1 files changed, 108 insertions, 0 deletions
diff --git a/v_windows/v/examples/sokol/06_obj_viewer/gouraud.glsl b/v_windows/v/examples/sokol/06_obj_viewer/gouraud.glsl
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index 0000000..7f36499
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+++ b/v_windows/v/examples/sokol/06_obj_viewer/gouraud.glsl
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+//#pragma sokol @ctype mat4 hmm_mat4
+
+#pragma sokol @vs vs
+
+uniform vs_params {
+	mat4 u_MVMatrix;       // A constant representing the combined model/view matrix.
+	mat4 u_MVPMatrix;      // A constant representing the combined model/view/projection matrix.
+	mat4 u_NMatrix;        // A constant representing the Normal Matrix
+};
+ 
+in vec4 a_Position;     // Per-vertex position information we will pass in.
+in vec3 a_Normal;       // Per-vertex normal information we will pass in.
+in vec4 a_Color;        // Per-vertex color information we will pass in.
+in vec2 a_Texcoord0;
+
+out vec3 v_Position;   // This will be passed into the fragment shader.
+out vec4 v_Color;      // This will be passed into the fragment shader.
+out vec3 v_Normal;     // This will be passed into the fragment shader.
+out vec3 v_Normal1;
+out vec2 uv;           // This will be passed into the fragment shader.
+
+// The entry point for our vertex shader.
+void main()
+{
+	// Transform the vertex into eye space.
+	v_Position = vec3(u_MVMatrix * a_Position);
+	// Pass through the color.
+	v_Color = a_Color;
+	// calc eye space normal
+	v_Normal = vec3(u_NMatrix * vec4(a_Normal, 1.0));
+	// texture coord
+	uv = a_Texcoord0;
+	
+	v_Normal1 = normalize(vec3(u_MVMatrix * vec4(a_Normal, 1.0)));
+	
+	// gl_Position is a special variable used to store the final position.
+	// Multiply the vertex by the matrix to get the final point in normalized screen coordinates.
+	gl_Position = u_MVPMatrix * a_Position;
+}
+
+#pragma sokol @end
+
+#pragma sokol @fs fs
+//precision mediump float;       // Set the default precision to medium. We don't need as high of a precision in the fragment shader
+uniform sampler2D tex;
+uniform fs_params {
+	vec4 u_LightPos;       // The position of the light in eye space.
+	vec4 ambientColor;
+	vec4 diffuseColor;
+	vec4 specularColor;
+	
+};
+in vec3 v_Position;       // Interpolated position for this fragment.
+in vec4 v_Color;          // This is the color from the vertex shader interpolated across the triangle per fragment.
+in vec3 v_Normal;         // Interpolated normal for this fragment.
+in vec3 v_Normal1;
+in vec2 uv;
+out vec4 frag_color;
+
+vec3 lightDirection = -u_LightPos.xyz;// vec3(0.0, -0.5, 0.5);
+//const vec4 ambientColor = vec4(0.094, 0.0, 0.0, 1.0);
+//const vec4 diffuseColor = vec4(0.5, 0.0, 0.0, 1.0);
+//const vec4 specularColor = vec4(1.0, 1.0, 1.0, 1.0);
+//const float shininess = 10.0;
+const vec4 lightColor = vec4(1.0, 1.0, 1.0, 1.0);
+
+vec3 phongBRDF(vec3 lightDir, vec3 viewDir, vec3 normal, vec3 phongDiffuseCol, vec3 phongSpecularCol, float phongShininess) {
+  vec3 color = phongDiffuseCol;
+  vec3 reflectDir = reflect(-lightDir, normal);
+  float specDot = max(dot(reflectDir, viewDir), 0.0);
+  color += pow(specDot, phongShininess) * phongSpecularCol;
+  return color;
+}
+
+vec4 getPhong(in vec4 diffuseColor) {
+  vec3 lightDir = normalize(-lightDirection);
+  vec3 viewDir = normalize(-v_Position);
+  vec3 n = normalize(v_Normal);
+
+  vec3 luminance = ambientColor.rgb * 0.5;
+  
+  float illuminance = dot(lightDir, n);
+  if(illuminance > 0.0) {
+		// we save specular shiness in specularColor.a
+    vec3 brdf = phongBRDF(lightDir, viewDir, n, diffuseColor.rgb, specularColor.rgb, specularColor.a * 1000);
+    luminance += brdf * illuminance * lightColor.rgb;
+  }
+
+  vec4 outColor = vec4(luminance,1.0);
+  return outColor;
+}
+          
+// The entry point for our fragment shader.
+void main()
+{
+	vec4 txt = texture(tex, uv);
+ 
+	// Directional light
+	float directional = dot(normalize(v_Normal1), normalize(vec3(0,0.5,1))) ;
+	directional = directional * 0.15;
+	 
+  // Multiply the color by the diffuse illumination level to get final output color.	
+	frag_color = vec4(clamp(directional + txt.rgb * getPhong(diffuseColor).rgb,0,1), txt.a * diffuseColor.a);
+	
+}
+#pragma sokol @end
+
+#pragma sokol @program gouraud vs fs
+\ No newline at end of file