add support for multiple textures in one part

Also added open/closed states for mouth

src/graphics.cpp

@@ -16,7 +16,7 @@ GLuint shader;	//standard shader program used for all elements
 GLuint transUniform;	//location of the "transMatrix" transformation matrix uniform in the shader
 
 //parts of the model (see modelpart.hpp)
-ModelPart parts[2];
+ModelPart parts[3];
 
 void display () {
 	glClear(GL_COLOR_BUFFER_BIT);
@@ -78,7 +78,9 @@ void initGraphics () {
 	initShader();
 
 	parts[0] = ModelPart("head-base.png", transUniform);
-	parts[1] = ModelPart("head-face.png", transUniform);
+	parts[1] = ModelPart("face-eyes.png", transUniform);
+	parts[2] = ModelPart("face-mouth-closed.png", transUniform);
+	parts[2].addTexture("face-mouth-open.png", 1);
 
 	//enable blending for alpha textures
 	glEnable(GL_BLEND);
@@ -173,10 +175,14 @@ void initModel () {
 
 }
 
-void updateModel(glm::vec2 headPos, glm::vec2 facePos) {
+void updateModel(glm::vec2 headPos, glm::vec2 facePos, bool mouthOpen) {
 	//calculate transforms
 	parts[0].setPosition(headPos);
 	parts[1].setPosition(facePos);
+	parts[2].setPosition(facePos);
+
+	//set mouth texture to open or closed
+	parts[2].selectTexture(mouthOpen ? 1 : 0);
 
 	//tell FreeGLUT to schedule a screen update
 	glutPostRedisplay();

src/graphics.hpp

@@ -16,6 +16,6 @@ void initShader();
 
 void printShaderCompileLog(GLuint shader);
 
-void updateModel(glm::vec2 headPos, glm::vec2 facePos);
+void updateModel(glm::vec2 headPos, glm::vec2 facePos, bool mouthOpen);
 
 #endif

src/main.cpp

@@ -3,10 +3,12 @@
 
 #include <graphics.hpp>
 
+#include <iostream>
+
 int main () {
 	initGraphics();
 
-	cv::CascadeClassifier faceDetector ("haarcascade_frontalface_alt2.xml");
+	cv::CascadeClassifier faceDetector ("lbpcascade_frontalface_improved.xml");
 
 	cv::Ptr<cv::face::Facemark> facemark = cv::face::FacemarkLBF::create();
 	facemark->loadModel ("lbfmodel.yaml");
@@ -51,6 +53,8 @@ int main () {
 				(landmarks[biggestFace][2].y + landmarks[biggestFace][14].y) / 2
 						), 6, cv::Scalar(0, 0, 255));
 			cv::circle (frame, landmarks[biggestFace][30], 6, cv::Scalar (0, 255, 255));
+			cv::circle (frame, landmarks[biggestFace][66], 3, cv::Scalar (0, 255, 0));
+			cv::circle (frame, landmarks[biggestFace][62], 3, cv::Scalar (0, 255, 0));
 
 			//send control information to graphics
 			updateModel(glm::vec2(
@@ -62,7 +66,8 @@ int main () {
 				glm::vec2(
 				landmarks[biggestFace][30].x * 2 / (float)frame.cols - 1,
 				landmarks[biggestFace][30].y * 2 / (float)frame.rows - 1
-				));
+				),
+				landmarks[biggestFace][66].y - landmarks[biggestFace][62].y > 5);
 		}
 
 		graphicsFrame ();

src/modelpart.cpp

@@ -14,18 +14,29 @@ ModelPart::ModelPart(const char* texPath, GLuint transUniformNum) {
 	//create vbo, ebo, vao
 	initBuffers(&vao);
 	//create texture
-	initTexture(&tex, texPath);
+	initTexture(&tex[0], texPath);
 
 	transUniform = transUniformNum;
+
+	empty = false;
 }
 
 void ModelPart::bindAndDraw() {
+	if (empty) { return; }
 	glBindVertexArray(vao);
-	glBindTexture(GL_TEXTURE_2D, tex);
+	glBindTexture(GL_TEXTURE_2D, tex[texSelection]);
 	glUniformMatrix4fv(transUniform, 1, GL_FALSE, glm::value_ptr(transMatrix));
 	glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
 }
 
 void ModelPart::setPosition(glm::vec2 position) {
-	transMatrix = glm::translate(glm::mat4(1.0f), glm::vec3(position.x, position.y, 0.0f));
+	transMatrix = glm::translate(glm::mat4(1.0f), glm::vec3(position.x, -position.y, 0.0f));
+}
+
+void ModelPart::addTexture(const char* texPath, size_t slot) {
+	initTexture(&tex[slot], texPath);
+}
+
+void ModelPart::selectTexture(size_t slot) {
+	texSelection = slot;
 }

src/modelpart.hpp

@@ -4,9 +4,15 @@
 #include <glm/ext/matrix_transform.hpp>
 
 class ModelPart {
-	GLuint vao, tex, transUniform;
+	GLuint vao, transUniform;
+
+	GLuint tex[16];	//support 16 textures to switch between
+	size_t texSelection = 0;
+
 	glm::mat4 transMatrix = glm::mat4(1.0f);
 
+	bool empty = true;
+	
 	public:
 		ModelPart();
 
@@ -15,6 +21,10 @@ class ModelPart {
 		void bindAndDraw();
 
 		void setPosition(glm::vec2 position);
+
+		void addTexture(const char* texPath, size_t slot);
+
+		void selectTexture(size_t slot);
 };
 
 #endif