Custom depth shader in materialPBRAdvanced Example (#7643)

#changelog #gl

Author: NickHardeman

examples/gl/materialPBRAdvanced/bin/data/shaders/main.vert

@@ -1,12 +1,25 @@
-
+// we set this define in the ofApp class
+#if defined(SHADOW_DEPTH_PASS)
+uniform mat4 modelMatrix;
+in vec4 position;
+uniform float iElapsedTime;
+uniform float uWiggleVerts;
+#else
 // the mesh we are using does not have texture coordinates
 // so we are going to send the local vertex positions to use for animation
 OUT vec3 v_localPos;
+#endif
+
 
 void main (void){
+	vec4 npos = position;
+	npos.xyz += uWiggleVerts * 0.25 * vec3( cos(iElapsedTime*1.3+(position.z*1.25)+position.y*1.25), 0.0, 0.0);
+#if defined(SHADOW_DEPTH_PASS)
+	vec3 worldPosition = (modelMatrix * vec4(npos.xyz, 1.0)).xyz;
+	sendShadowDepthWorldPosition(worldPosition);
+#else
 	v_localPos = position.xyz;
-	vec4 npos = getTransformedPosition();
-//	npos.xyz += vec3( cos(iElapsedTime+v_localPos.y*1.85), 0.0, 0.0);
 	sendVaryings(npos);
 	gl_Position = modelViewProjectionMatrix * npos;
+#endif
 }

examples/gl/materialPBRAdvanced/src/ofApp.cpp

@@ -72,15 +72,15 @@ void ofApp::draw(){
 		int numShadowPasses = light.getNumShadowDepthPasses();
 		for( int j = 0; j < numShadowPasses; j++ ) {
 			light.beginShadowDepthPass(j);
-			renderScene();
+			renderScene(true);
 			light.endShadowDepthPass(j);
 		}
 	}
 
 
 	camera.begin(); {
 
-		renderScene();
+		renderScene(false);
 
 		 if( cubeMap.hasPrefilteredMap() ) {
 		 	cubeMap.drawPrefilteredCube(0.2f);
@@ -108,11 +108,12 @@ void ofApp::draw(){
 
 	stringstream ss;
 	ss << "Reload shader(r): make changes to shader in data/shaders/main.frag and then press 'r' to see changes.";
+	ss << endl << "Wiggle verts(w): " << (bWiggleVerts ? "yes" : "no");
 	ofDrawBitmapStringHighlight(ss.str(), 40, 40);
 }
 
 //--------------------------------------------------------------
-void ofApp::renderScene() {
+void ofApp::renderScene(bool bShadowPass) {
 
 	matFloor.setMetallic(0.0);
 	matFloor.setReflectance(0.01);
@@ -140,7 +141,14 @@ void ofApp::renderScene() {
 	ofPopMatrix();
 	matSphere.end();
 
+	if( bShadowPass && bWiggleVerts ) {
+		mDepthShader.begin();
+		mDepthShader.setUniform1f("iElapsedTime", ofGetElapsedTimef());
+		mDepthShader.setUniform1f("uWiggleVerts", bWiggleVerts ? 1.0f : 0.0f);
+	}
+	// setting custom uniforms on a material automatically adds it to the shader
 	matLogo.setCustomUniform1f("iElapsedTime", ofGetElapsedTimef());
+	matLogo.setCustomUniform1f("uWiggleVerts", bWiggleVerts ? 1.0f : 0.0f);
 	matLogo.begin();
 	ofPushMatrix();
 	ofTranslate( -70, -250, 0 );
@@ -149,6 +157,9 @@ void ofApp::renderScene() {
 	meshLogoHollow.draw();
 	ofPopMatrix();
 	matLogo.end();
+	if(bShadowPass && bWiggleVerts ) {
+		mDepthShader.end();
+	}
 }
 
 //--------------------------------------------------------------
@@ -161,6 +172,9 @@ bool ofApp::reloadShader() {
 	if( vbuffer.size() && fbuffer.size() ) {
 		matLogo.setShaderMain(vbuffer.getText(), GL_VERTEX_SHADER, "main.vert");
 		matLogo.setShaderMain(fbuffer.getText(), GL_FRAGMENT_SHADER, "main.frag");
+		// configure the shader to include shadow functions for passing depth
+		// declare a define so we can use the same shader file and run different bits of code
+		light.getShadow().setupShadowDepthShader(mDepthShader, "#define SHADOW_DEPTH_PASS\n"+vbuffer.getText());
 		return true;
 	}
 	return false;
@@ -174,6 +188,9 @@ void ofApp::keyPressed(int key){
 	if( key == 'd' ) {
 		bDebug = !bDebug;
 	}
+	if( key == 'w') {
+		bWiggleVerts = !bWiggleVerts;
+	}
 }
 
 //--------------------------------------------------------------

examples/gl/materialPBRAdvanced/src/ofApp.h

@@ -9,7 +9,7 @@ class ofApp : public ofBaseApp{
 		void update();
 		void draw();
 
-		void renderScene();
+		void renderScene(bool bShadowPass);
 
 		bool reloadShader();
 
@@ -35,9 +35,12 @@ class ofApp : public ofBaseApp{
 
 		ofVboMesh meshPlySphere;
 
+		ofShader mDepthShader;
+	
 		int mode = 0;
 
 		ofLight light;
 		bool bDebug = false;
+		bool bWiggleVerts = false;
 
 };