color remapping

zoneb/bin/data/shaders/render.frag

@@ -6,6 +6,7 @@ precision mediump float;
 
 uniform sampler2D uColorTex; // Sampler for the color registered data
 uniform sampler2D u_v4l2cam;
+uniform sampler2D u_gradient;
 
 in vec2 gTexCoord;
 
@@ -18,7 +19,8 @@ void main()
     st += vec2(0.5);
     st.s += 0.15;
     st.t += 0.16;
-    gl_FragColor = texture2D(u_v4l2cam, st);
+    float thermo = texture2D(u_v4l2cam, st).r;
+    gl_FragColor = vec4(texture2D(u_gradient, vec2(thermo, 0.5)).rgb, 1);
     // gl_FragColor = texture2D(uColorTex, gTexCoord);
     // gl_FragColor = vec4(1);
 }

zoneb/src/ofApp.cpp

@@ -68,6 +68,8 @@ void ofApp::setup()
   // we use a texture because the ofxV4L2 class has no draw method (yet)
   // we use GL_LUMINANCE because the ofxV4L2 class supports only grayscale (for now)
   v4l2Tex.allocate(camWidth, camHeight, GL_LUMINANCE);
+
+  gradient.load("gradient.png");
 }
 
 //--------------------------------------------------------------
@@ -121,6 +123,7 @@ void ofApp::draw()
       shader.setUniformTexture("uWorldTex", kinectDevice.getColorToWorldTex(), 2);
       shader.setUniformTexture("uColorTex", kinectDevice.getColorTex(), 3);
       shader.setUniformTexture("u_v4l2cam", v4l2Tex, 4);
+      shader.setUniformTexture("u_gradient", gradient, 5);
       shader.setUniform2i("uFrameSize", kinectDevice.getColorTex().getWidth(), kinectDevice.getColorTex().getHeight());
       shader.setUniform2i("uDepthFrameSize", kinectDevice.getDepthInColorTex().getWidth(), kinectDevice.getDepthInColorTex().getHeight());
 
@@ -132,6 +135,7 @@ void ofApp::draw()
       shader.setUniformTexture("uWorldTex", kinectDevice.getDepthToWorldTex(), 2);
       shader.setUniformTexture("uColorTex", kinectDevice.getColorInDepthTex(), 3);
       shader.setUniformTexture("u_v4l2cam", v4l2Tex, 4);
+      shader.setUniformTexture("u_gradient", gradient, 5);
       shader.setUniform2i("uFrameSize", kinectDevice.getDepthTex().getWidth(), kinectDevice.getDepthTex().getHeight());
       shader.setUniform2i("uDepthFrameSize", kinectDevice.getDepthTex().getWidth(), kinectDevice.getDepthTex().getHeight());
 
@@ -149,6 +153,7 @@ void ofApp::draw()
     boundShader.setUniformTexture("u_depth", tex);
     boundShader.setUniformTexture("u_ofcam", fbos.at("ofcam"));
     boundShader.setUniformTexture("u_v4l2cam", v4l2Tex);
+    boundShader.setUniformTexture("u_gradient", gradient);
     boundShader.setUniform1i("u_init", 1);
     boundShader.render();
     boundShader.setUniform1i("u_init", 0);

zoneb/src/ofApp.h

@@ -43,4 +43,6 @@ private:
   bool useColorSpace;
   ofxV4L2 v4l2Cam;
   ofTexture v4l2Tex;
+
+  ofImage gradient;
 };