Added stencil testing
This demo show how to draw an outline around an object.... very cool ! :)
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20
.vscode/settings.json
vendored
20
.vscode/settings.json
vendored
@ -43,6 +43,24 @@
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"stdexcept": "cpp",
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"streambuf": "cpp",
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"cinttypes": "cpp",
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"typeinfo": "cpp"
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"typeinfo": "cpp",
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"hash_map": "cpp",
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"hash_set": "cpp",
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"bitset": "cpp",
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"chrono": "cpp",
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"codecvt": "cpp",
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"condition_variable": "cpp",
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"cstring": "cpp",
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"ctime": "cpp",
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"forward_list": "cpp",
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"list": "cpp",
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"unordered_set": "cpp",
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"map": "cpp",
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"ratio": "cpp",
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"regex": "cpp",
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"set": "cpp",
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"iomanip": "cpp",
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"mutex": "cpp",
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"thread": "cpp"
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}
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}
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13
outlineshader.fs
Normal file
13
outlineshader.fs
Normal file
@ -0,0 +1,13 @@
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#version 460 core
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uniform vec3 outlineColor;
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out vec4 FragColor;
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in vec2 texCoords;
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uniform sampler2D texture_diffuse1;
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void main(){
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FragColor = vec4(outlineColor, 1.0);
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}
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@ -7,5 +7,5 @@ uniform sampler2D texture_diffuse1;
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void main()
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{
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FragColor = texture( texture_diffuse1, TexCoords);
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FragColor = texture( texture_diffuse1, TexCoords) ;
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}
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54
src/main.cpp
54
src/main.cpp
@ -85,7 +85,7 @@ int main() {
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glViewport(0,0, 800, 600);
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glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
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//glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
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glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
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glfwSetCursorPosCallback(window, mouse_callback);
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glfwSetScrollCallback(window, scroll_callback);
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@ -94,41 +94,69 @@ int main() {
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Shader shader ("shader.vs", "shader.fs");
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Shader outlineShader("shader.vs","outlineshader.fs");
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Model backpack("Models/backpack.obj");
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glEnable(GL_DEPTH_TEST);
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glEnable(GL_STENCIL_TEST);
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glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
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///glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
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while(!glfwWindowShouldClose(window))
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{
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float currentFrame = glfwGetTime();
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deltaTime = currentFrame - lastFrame;
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lastFrame = currentFrame;
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// std::cout << "Delta Time: " << deltaTime << std::endl;
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processInput(window);
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glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
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shader.use();
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glm::mat4 model = glm::mat4(1.0f);
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glm::mat4 view = glm::mat4(1.0f);
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glm::mat4 projection = glm::mat4(1.0f);
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view = camera.GetViewMatrix();
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projection = glm::perspective(glm::radians(camera.Zoom), (float)800 / (float)600, 0.1f, 100.0f);
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glm::mat4 view = camera.GetViewMatrix();
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glm::mat4 projection = glm::perspective(glm::radians(camera.Zoom), (float)800 / (float)600, 0.1f, 100.0f);
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model = glm::mat4(1.0);
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shader.setMat4("projection", projection);
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shader.setMat4("view", view);
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glStencilFunc(GL_ALWAYS, 1, 0xff);
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glStencilMask(0xFF);
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shader.use();
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shader.setMat4("model", model);
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shader.setMat4("view", view);
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shader.setMat4("projection", projection);
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backpack.Draw(shader);
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glStencilFunc(GL_NOTEQUAL, 1, 0xFF);
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glStencilMask(0x00);
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glDisable(GL_DEPTH_TEST);
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outlineShader.use();
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outlineShader.setMat4("model", model);
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outlineShader.setMat4("view", view);
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outlineShader.setMat4("projection", projection);
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outlineShader.setVec3("outlineColor", glm::vec3(0.28, 0.10, 0.26));
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model = glm::scale(model, glm::vec3(1.05f,1.05f, 1.05f));
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// model = glm::translate(model, glm::vec3(1.0f, 0.0f, 0.0f));
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outlineShader.setMat4("model", model);
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backpack.Draw(outlineShader);
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glStencilMask(0xFF);
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glStencilFunc(GL_ALWAYS, 1, 0xFF);
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glEnable(GL_DEPTH_TEST);
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glfwSwapBuffers(window);
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glfwPollEvents();
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}
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41
src/mesh.cpp
41
src/mesh.cpp
@ -2,7 +2,7 @@
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Mesh::Mesh(std::vector<Vertex> vertices, std::vector<unsigned int> indices, std::vector<Texture> textures)
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: vertices(vertices) , indices(indices), textures(textures){
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: vertices(vertices) , indices(indices), textures(textures), showOutline(false){
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setupMesh();
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}
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@ -35,31 +35,36 @@ void Mesh::setupMesh(){
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glBindVertexArray(0);
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}
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void Mesh::Draw( Shader &shader){
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unsigned int diffuseNr = 1;
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unsigned int specularNr = 1;
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for(unsigned int i = 0; i < textures.size(); i++){
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glActiveTexture(GL_TEXTURE0 + i);
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void Mesh::Draw( Shader &shader ){
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std::string number;
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std::string name = textures[i].type;
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if( name == "texture_diffuse")
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number = std::to_string(diffuseNr++);
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else if(name == "texture_specular")
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number = std::to_string(specularNr++);
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glUniform1i( glGetUniformLocation( shader.ID, (name + number).c_str()), i);
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glBindTexture(GL_TEXTURE_2D, textures[i].id);
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}
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shader.use();
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unsigned int diffuseNr = 1;
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unsigned int specularNr = 1;
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for(unsigned int i = 0; i < textures.size(); i++){
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glActiveTexture(GL_TEXTURE0 + i);
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std::string number;
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std::string name = textures[i].type;
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if( name == "texture_diffuse")
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number = std::to_string(diffuseNr++);
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else if(name == "texture_specular")
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number = std::to_string(specularNr++);
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glUniform1i( glGetUniformLocation( shader.ID, (name + number).c_str()), i);
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glBindTexture(GL_TEXTURE_2D, textures[i].id);
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}
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// draw mesh
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glBindVertexArray(VAO);
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glDrawElements(GL_TRIANGLES, static_cast <unsigned int>(indices.size()), GL_UNSIGNED_INT, 0);
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glBindVertexArray(0);
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glActiveTexture(GL_TEXTURE0);
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}
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@ -19,6 +19,9 @@ class Mesh{
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Mesh(std::vector<Vertex> vertices, std::vector<unsigned int> indices, std::vector<Texture> textures);
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void Draw(Shader &shader);
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bool showOutline;
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private:
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// render data
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unsigned int VAO, VBO, EBO;
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@ -91,6 +91,8 @@ void Shader::use(){
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glUseProgram(ID);
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}
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void Shader::setBool(const std::string &name, bool value) const{
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glUniform1i(glGetUniformLocation(ID, name.c_str()), (int) value );
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}
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