added texture matrix in Cinder project

Author: codeanticode

ports/cinder/Ex_7_2_texpixlight/assets/pixlightvert.glsl

@@ -3,6 +3,7 @@
 uniform mat4 ciModelView;
 uniform mat4 ciModelViewProjection;
 uniform mat3 ciNormalMatrix;
+uniform mat4 textureMatrix;
 
 uniform vec4 lightPosition;
 
@@ -24,5 +25,5 @@ void main() {
   lightDir = normalize(lightPosition.xyz - ecVertex); 
   vertColor = ciColor;
 
-  vertTexCoord = vec4(ciTexCoord0.x, 1 - ciTexCoord0.y, 0, 1);
+  vertTexCoord = textureMatrix * vec4(ciTexCoord0, 0, 1);
 }

ports/cinder/Ex_7_2_texpixlight/src/Ex_7_2_texpixlightApp.cpp

@@ -34,9 +34,7 @@ void Ex_7_2_texpixlightApp::setup() {
    	auto img = loadImage(loadAsset("lachoy.jpg"));
     label = gl::Texture2d::create(img);
 
-    pointLight[0] = 0;
-    pointLight[1] = -getWindowHeight();
-    pointLight[2] = 0;
+    pointLight[0] = 0; pointLight[1] = -getWindowHeight(); pointLight[2] = 0;
 
     shader = gl::GlslProg::create(loadAsset("pixlightvert.glsl"), loadAsset("pixlightfrag.glsl"));
     shader->uniform("texMap", 0);
@@ -60,6 +58,10 @@ void Ex_7_2_texpixlightApp::draw() {
     gl::setMatrices(cam);
     gl::ScopedModelMatrix modelScope;
 
+    mat4 tm = mat4(1.0);
+    tm[1][1] = -1; tm[3][1] = 1;
+    shader->uniform("textureMatrix", tm);
+    
     mat4 mv = gl::getModelMatrix();
     vec4 lightPos = mv * vec4(pointLight, 1.0f);
     shader->uniform("lightPosition", lightPos);