Update examples

1 files changed, 13 insertions, 39 deletions

diff --git a/examples/shaders/shaders_mesh_instancing.data b/examples/shaders/shaders_mesh_instancing.data
index c3aa7af..441e858 100644
--- a/examples/shaders/shaders_mesh_instancing.data
+++ b/examples/shaders/shaders_mesh_instancing.data
@@ -53,17 +53,17 @@ void main()
         if (lights[i].enabled == 1)
         {
             vec3 light = vec3(0.0);
-            
-            if (lights[i].type == LIGHT_DIRECTIONAL) 
+
+            if (lights[i].type == LIGHT_DIRECTIONAL)
             {
                 light = -normalize(lights[i].target - lights[i].position);
             }
-            
-            if (lights[i].type == LIGHT_POINT) 
+
+            if (lights[i].type == LIGHT_POINT)
             {
                 light = normalize(lights[i].position - fragPosition);
             }
-            
+
             float NdotL = max(dot(normal, light), 0.0);
             lightDot += lights[i].color.rgb*NdotL;
 
@@ -75,7 +75,7 @@ void main()
 
     vec4 finalColor = (texelColor*((colDiffuse + vec4(specular, 1.0))*vec4(lightDot, 1.0)));
     finalColor += texelColor*(ambient/10.0);
-    
+
     // Gamma correction
     gl_FragColor = pow(finalColor, vec4(1.0/2.2));
 }
@@ -87,10 +87,11 @@ attribute vec2 vertexTexCoord;
 attribute vec3 vertexNormal;
 attribute vec4 vertexColor;
 
-attribute mat4 instance;
+attribute mat4 instanceTransform;
 
 // Input uniform values
 uniform mat4 mvp;
+uniform mat4 matNormal;
 
 // Output vertex attributes (to fragment shader)
 varying vec3 fragPosition;
@@ -100,43 +101,16 @@ varying vec3 fragNormal;
 
 // NOTE: Add here your custom variables
 
-// https://github.com/glslify/glsl-inverse
-mat3 inverse(mat3 m)
-{
-  float a00 = m[0][0], a01 = m[0][1], a02 = m[0][2];
-  float a10 = m[1][0], a11 = m[1][1], a12 = m[1][2];
-  float a20 = m[2][0], a21 = m[2][1], a22 = m[2][2];
-
-  float b01 = a22*a11 - a12*a21;
-  float b11 = -a22*a10 + a12*a20;
-  float b21 = a21*a10 - a11*a20;
-
-  float det = a00*b01 + a01*b11 + a02*b21;
-
-  return mat3(b01, (-a22*a01 + a02*a21), (a12*a01 - a02*a11),
-              b11, (a22*a00 - a02*a20), (-a12*a00 + a02*a10),
-              b21, (-a21*a00 + a01*a20), (a11*a00 - a01*a10))/det;
-}
-
-// https://github.com/glslify/glsl-transpose
-mat3 transpose(mat3 m)
-{
-  return mat3(m[0][0], m[1][0], m[2][0],
-              m[0][1], m[1][1], m[2][1],
-              m[0][2], m[1][2], m[2][2]);
-}
-
 void main()
 {
+    // Compute MVP for current instance
+    mat4 mvpi = mvp*instanceTransform;
+
     // Send vertex attributes to fragment shader
-    fragPosition = vec3(instance*vec4(vertexPosition, 1.0));
+    fragPosition = vec3(mvpi*vec4(vertexPosition, 1.0));
     fragTexCoord = vertexTexCoord;
     fragColor = vertexColor;
-
-    mat3 normalMatrix = transpose(inverse(mat3(instance)));
-    fragNormal = normalize(normalMatrix*vertexNormal);
-
-    mat4 mvpi = mvp*instance;
+    fragNormal = normalize(vec3(matNormal*vec4(vertexNormal, 1.0)));
 
     // Calculate final vertex position
     gl_Position = mvpi*vec4(vertexPosition, 1.0);