updated picking

shaders/forward.frag.glsl

@@ -55,7 +55,7 @@ uniform float attenuation;
 #endif
 
 layout(location = 0)out vec4 outColor;
-layout(location = 1)out vec4 pickData;
+layout(location = 1)out vec3 pickData;
 
 vec3 phongLighting(in vec3 kd, in vec3 ks, in float ns, in vec3 color, in vec3 normal, in vec3 lightDir, in vec3 halfVec){
     float diffuseComponent = max(dot(normal, lightDir), 0);
@@ -119,12 +119,12 @@ void main(void) {
 #endif
 
 #ifdef INSTANCING
-    pickData = vec4(gl_FragCoord.z, gl_FragCoord.w, float(int(objectId) + instanceId), 0);
+    pickData = vec3(gl_FragCoord.z, gl_FragCoord.w, float(int(objectId) + instanceId));
 #else
-    pickData = vec4(gl_FragCoord.z, gl_FragCoord.w, float(objectId), 0);
+    pickData = vec3(gl_FragCoord.z, gl_FragCoord.w, float(objectId));
 #endif
 
 #ifndef AMBIENT_LIGHT
-    pickData = vec4(0);
+    pickData = vec3(0);
 #endif
 }

src/posteffectmodule.cpp

@@ -72,6 +72,10 @@ void PostEffectModule::resize(int w, int h)
     tex = new Texture(GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT, width, height, GL_FLOAT, GL_TEXTURE_RECTANGLE);
     frameBuffers[INPUT_FBO].addTexture(tex, GL_DEPTH_ATTACHMENT);
 
+    // Picking texture
+    tex = new Texture(GL_RGB, GL_RGB32F, width, height, GL_FLOAT, GL_TEXTURE_RECTANGLE);
+    frameBuffers[INPUT_FBO].addTexture(tex, GL_COLOR_ATTACHMENT1);
+
     frameBuffers[INPUT_FBO].initColorAttachments();
 
 
@@ -122,10 +126,13 @@ void PostEffectModule::renderGL(Camera* myCamera, Scene* scene)
 
         glAssert(glBindVertexArray(vao));
 
+        // threasholding the luminance to isolate high luminance pixels for bloom
         luminanceStep();
 
+        // blur the high luminance pixels
         bloomStep();
 
+        // compute average luminance and apply tonemapping
         hdrStep();
 
         glAssert(glEnable(GL_DEPTH_TEST));
@@ -218,6 +225,17 @@ void PostEffectModule::setShaders(const std::string &luminanceFragSource,
 
 }
 
+glm::vec3 PostEffectModule::getObjectInfo(int x, int y)
+{
+    fbo->getTexture(1)->bind(0);
+    glm::vec3 *val = new glm::vec3[w*h];
+    glAssert(glGetTexImage(GL_TEXTURE_RECTANGLE, 0, GL_RGB, GL_FLOAT, val));
+    glm::vec3 ret = val[x + (h-y)*w];
+    ret.z -= 1; // clearColor compensation
+    delete[] val;
+    return ret;
+}
+
 const std::string PostEffectModule::vertSource =
         "layout(location = 0)in vec2 inPosition;\n\
         void main(void) {\n\

src/posteffectmodule.h

@@ -81,6 +81,8 @@ public:
     void setRenderTarget(FrameBuffer* renderTarget) {outputFBO = renderTarget;}
 
     void setBloomThreshold(float threshold) {bloom_threshold = threshold;}
+
+    glm::vec3 getObjectInfo(int x, int y);
 };
 
 #endif // POSTEFFECTMODULE_H