mirror of
https://github.com/JoeyDeVries/LearnOpenGL.git
synced 2026-01-30 20:13:22 +08:00
Initial commit, all code samples with working CMake script for VS/Windows.
This commit is contained in:
Joey de Vries
337
src/4.advanced_opengl/2.stencil_testing/stencil_testing.cpp
Normal file
337
src/4.advanced_opengl/2.stencil_testing/stencil_testing.cpp
Normal file
@@ -0,0 +1,337 @@
|
||||
// Std. Includes
|
||||
#include <string>
|
||||
|
||||
// GLEW
|
||||
#define GLEW_STATIC
|
||||
#include <GL/glew.h>
|
||||
|
||||
// GLFW
|
||||
#include <GLFW/glfw3.h>
|
||||
|
||||
// GL includes
|
||||
#include <learnopengl/shader.h>
|
||||
#include <learnopengl/camera.h>
|
||||
|
||||
// GLM Mathemtics
|
||||
#include <glm/glm.hpp>
|
||||
#include <glm/gtc/matrix_transform.hpp>
|
||||
#include <glm/gtc/type_ptr.hpp>
|
||||
|
||||
// Other Libs
|
||||
#include <SOIL.h>
|
||||
|
||||
// Properties
|
||||
GLuint screenWidth = 800, screenHeight = 600;
|
||||
|
||||
// Function prototypes
|
||||
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode);
|
||||
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
|
||||
void mouse_callback(GLFWwindow* window, double xpos, double ypos);
|
||||
void Do_Movement();
|
||||
GLuint loadTexture(GLchar* path);
|
||||
|
||||
// Camera
|
||||
Camera camera(glm::vec3(0.0f, 0.0f, 3.0f));
|
||||
bool keys[1024];
|
||||
GLfloat lastX = 400, lastY = 300;
|
||||
bool firstMouse = true;
|
||||
|
||||
GLfloat deltaTime = 0.0f;
|
||||
GLfloat lastFrame = 0.0f;
|
||||
|
||||
// The MAIN function, from here we start our application and run our Game loop
|
||||
int main()
|
||||
{
|
||||
// Init GLFW
|
||||
glfwInit();
|
||||
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
|
||||
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
|
||||
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
|
||||
glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
|
||||
|
||||
GLFWwindow* window = glfwCreateWindow(screenWidth, screenHeight, "LearnOpenGL", nullptr, nullptr); // Windowed
|
||||
glfwMakeContextCurrent(window);
|
||||
|
||||
// Set the required callback functions
|
||||
glfwSetKeyCallback(window, key_callback);
|
||||
glfwSetCursorPosCallback(window, mouse_callback);
|
||||
glfwSetScrollCallback(window, scroll_callback);
|
||||
|
||||
// Options
|
||||
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
|
||||
|
||||
// Initialize GLEW to setup the OpenGL Function pointers
|
||||
glewExperimental = GL_TRUE;
|
||||
glewInit();
|
||||
|
||||
// Define the viewport dimensions
|
||||
glViewport(0, 0, screenWidth, screenHeight);
|
||||
|
||||
// Setup some OpenGL options
|
||||
glEnable(GL_DEPTH_TEST);
|
||||
glDepthFunc(GL_LESS);
|
||||
glEnable(GL_STENCIL_TEST);
|
||||
glStencilFunc(GL_NOTEQUAL, 1, 0xFF);
|
||||
glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
|
||||
|
||||
// Setup and compile our shaders
|
||||
Shader shader("stencil_testing.vs", "stencil_testing.frag");
|
||||
Shader shaderSingleColor("stencil_testing.vs", "stencil_single_color.frag");
|
||||
|
||||
#pragma region "object_initialization"
|
||||
// Set the object data (buffers, vertex attributes)
|
||||
GLfloat cubeVertices[] = {
|
||||
// Positions // Texture Coords
|
||||
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
|
||||
0.5f, -0.5f, -0.5f, 1.0f, 0.0f,
|
||||
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
|
||||
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
|
||||
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f,
|
||||
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
|
||||
|
||||
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
|
||||
0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
|
||||
0.5f, 0.5f, 0.5f, 1.0f, 1.0f,
|
||||
0.5f, 0.5f, 0.5f, 1.0f, 1.0f,
|
||||
-0.5f, 0.5f, 0.5f, 0.0f, 1.0f,
|
||||
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
|
||||
|
||||
-0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
|
||||
-0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
|
||||
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
|
||||
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
|
||||
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
|
||||
-0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
|
||||
|
||||
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
|
||||
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
|
||||
0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
|
||||
0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
|
||||
0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
|
||||
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
|
||||
|
||||
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
|
||||
0.5f, -0.5f, -0.5f, 1.0f, 1.0f,
|
||||
0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
|
||||
0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
|
||||
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
|
||||
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
|
||||
|
||||
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f,
|
||||
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
|
||||
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
|
||||
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
|
||||
-0.5f, 0.5f, 0.5f, 0.0f, 0.0f,
|
||||
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f
|
||||
};
|
||||
GLfloat planeVertices[] = {
|
||||
// Positions // Texture Coords (note we set these higher than 1 that together with GL_REPEAT (as texture wrapping mode) will cause the floor texture to repeat)
|
||||
5.0f, -0.5f, 5.0f, 2.0f, 0.0f,
|
||||
-5.0f, -0.5f, 5.0f, 0.0f, 0.0f,
|
||||
-5.0f, -0.5f, -5.0f, 0.0f, 2.0f,
|
||||
|
||||
5.0f, -0.5f, 5.0f, 2.0f, 0.0f,
|
||||
-5.0f, -0.5f, -5.0f, 0.0f, 2.0f,
|
||||
5.0f, -0.5f, -5.0f, 2.0f, 2.0f
|
||||
};
|
||||
// Setup cube VAO
|
||||
GLuint cubeVAO, cubeVBO;
|
||||
glGenVertexArrays(1, &cubeVAO);
|
||||
glGenBuffers(1, &cubeVBO);
|
||||
glBindVertexArray(cubeVAO);
|
||||
glBindBuffer(GL_ARRAY_BUFFER, cubeVBO);
|
||||
glBufferData(GL_ARRAY_BUFFER, sizeof(cubeVertices), &cubeVertices, GL_STATIC_DRAW);
|
||||
glEnableVertexAttribArray(0);
|
||||
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)0);
|
||||
glEnableVertexAttribArray(1);
|
||||
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
|
||||
glBindVertexArray(0);
|
||||
// Setup plane VAO
|
||||
GLuint planeVAO, planeVBO;
|
||||
glGenVertexArrays(1, &planeVAO);
|
||||
glGenBuffers(1, &planeVBO);
|
||||
glBindVertexArray(planeVAO);
|
||||
glBindBuffer(GL_ARRAY_BUFFER, planeVBO);
|
||||
glBufferData(GL_ARRAY_BUFFER, sizeof(planeVertices), &planeVertices, GL_STATIC_DRAW);
|
||||
glEnableVertexAttribArray(0);
|
||||
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)0);
|
||||
glEnableVertexAttribArray(1);
|
||||
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat)));
|
||||
glBindVertexArray(0);
|
||||
|
||||
// Load textures
|
||||
GLuint cubeTexture = loadTexture("../../../resources/textures/marble.jpg");
|
||||
GLuint floorTexture = loadTexture("../../../resources/textures/metal.png");
|
||||
#pragma endregion
|
||||
|
||||
// Game loop
|
||||
while(!glfwWindowShouldClose(window))
|
||||
{
|
||||
// Set frame time
|
||||
GLfloat currentFrame = glfwGetTime();
|
||||
deltaTime = currentFrame - lastFrame;
|
||||
lastFrame = currentFrame;
|
||||
|
||||
// Check and call events
|
||||
glfwPollEvents();
|
||||
Do_Movement();
|
||||
|
||||
// Clear the colorbuffer
|
||||
glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
|
||||
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
|
||||
|
||||
// Set uniforms
|
||||
shaderSingleColor.Use();
|
||||
glm::mat4 model;
|
||||
glm::mat4 view = camera.GetViewMatrix();
|
||||
glm::mat4 projection = glm::perspective(camera.Zoom, (float)screenWidth/(float)screenHeight, 0.1f, 100.0f);
|
||||
glUniformMatrix4fv(glGetUniformLocation(shaderSingleColor.Program, "view"), 1, GL_FALSE, glm::value_ptr(view));
|
||||
glUniformMatrix4fv(glGetUniformLocation(shaderSingleColor.Program, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
|
||||
shader.Use();
|
||||
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "view"), 1, GL_FALSE, glm::value_ptr(view));
|
||||
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
|
||||
|
||||
|
||||
// Draw floor as normal, we only care about the containers. The floor should NOT fill the stencil buffer so we set its mask to 0x00
|
||||
glStencilMask(0x00);
|
||||
// Floor
|
||||
glBindVertexArray(planeVAO);
|
||||
glBindTexture(GL_TEXTURE_2D, floorTexture);
|
||||
model = glm::mat4();
|
||||
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
|
||||
glDrawArrays(GL_TRIANGLES, 0, 6);
|
||||
glBindVertexArray(0);
|
||||
|
||||
// == =============
|
||||
// 1st. Render pass, draw objects as normal, filling the stencil buffer
|
||||
glStencilFunc(GL_ALWAYS, 1, 0xFF);
|
||||
glStencilMask(0xFF);
|
||||
// Cubes
|
||||
glBindVertexArray(cubeVAO);
|
||||
glBindTexture(GL_TEXTURE_2D, cubeTexture);
|
||||
model = glm::translate(model, glm::vec3(-1.0f, 0.0f, -1.0f));
|
||||
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
|
||||
glDrawArrays(GL_TRIANGLES, 0, 36);
|
||||
model = glm::mat4();
|
||||
model = glm::translate(model, glm::vec3(2.0f, 0.0f, 0.0f));
|
||||
glUniformMatrix4fv(glGetUniformLocation(shader.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
|
||||
glDrawArrays(GL_TRIANGLES, 0, 36);
|
||||
glBindVertexArray(0);
|
||||
|
||||
// == =============
|
||||
// 2nd. Render pass, now draw slightly scaled versions of the objects, this time disabling stencil writing.
|
||||
// Because stencil buffer is now filled with several 1s. The parts of the buffer that are 1 are now not drawn, thus only drawing
|
||||
// the objects' size differences, making it look like borders.
|
||||
glStencilFunc(GL_NOTEQUAL, 1, 0xFF);
|
||||
glStencilMask(0x00);
|
||||
glDisable(GL_DEPTH_TEST);
|
||||
shaderSingleColor.Use();
|
||||
GLfloat scale = 1.1;
|
||||
// Cubes
|
||||
glBindVertexArray(cubeVAO);
|
||||
glBindTexture(GL_TEXTURE_2D, cubeTexture);
|
||||
model = glm::mat4();
|
||||
model = glm::translate(model, glm::vec3(-1.0f, 0.0f, -1.0f));
|
||||
model = glm::scale(model, glm::vec3(scale, scale, scale));
|
||||
glUniformMatrix4fv(glGetUniformLocation(shaderSingleColor.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
|
||||
glDrawArrays(GL_TRIANGLES, 0, 36);
|
||||
model = glm::mat4();
|
||||
model = glm::translate(model, glm::vec3(2.0f, 0.0f, 0.0f));
|
||||
model = glm::scale(model, glm::vec3(scale, scale, scale));
|
||||
glUniformMatrix4fv(glGetUniformLocation(shaderSingleColor.Program, "model"), 1, GL_FALSE, glm::value_ptr(model));
|
||||
glDrawArrays(GL_TRIANGLES, 0, 36);
|
||||
glBindVertexArray(0);
|
||||
glStencilMask(0xFF);
|
||||
glEnable(GL_DEPTH_TEST);
|
||||
|
||||
// Swap the buffers
|
||||
glfwSwapBuffers(window);
|
||||
}
|
||||
|
||||
glfwTerminate();
|
||||
return 0;
|
||||
}
|
||||
|
||||
void DrawScene()
|
||||
{
|
||||
|
||||
}
|
||||
|
||||
// This function loads a texture from file. Note: texture loading functions like these are usually
|
||||
// managed by a 'Resource Manager' that manages all resources (like textures, models, audio).
|
||||
// For learning purposes we'll just define it as a utility function.
|
||||
GLuint loadTexture(GLchar* path)
|
||||
{
|
||||
//Generate texture ID and load texture data
|
||||
GLuint textureID;
|
||||
glGenTextures(1, &textureID);
|
||||
int width,height;
|
||||
unsigned char* image = SOIL_load_image(path, &width, &height, 0, SOIL_LOAD_RGB);
|
||||
// Assign texture to ID
|
||||
glBindTexture(GL_TEXTURE_2D, textureID);
|
||||
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
|
||||
glGenerateMipmap(GL_TEXTURE_2D);
|
||||
|
||||
// Parameters
|
||||
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
|
||||
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
|
||||
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR );
|
||||
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
|
||||
glBindTexture(GL_TEXTURE_2D, 0);
|
||||
SOIL_free_image_data(image);
|
||||
return textureID;
|
||||
|
||||
}
|
||||
|
||||
#pragma region "User input"
|
||||
|
||||
// Moves/alters the camera positions based on user input
|
||||
void Do_Movement()
|
||||
{
|
||||
// Camera controls
|
||||
if(keys[GLFW_KEY_W])
|
||||
camera.ProcessKeyboard(FORWARD, deltaTime);
|
||||
if(keys[GLFW_KEY_S])
|
||||
camera.ProcessKeyboard(BACKWARD, deltaTime);
|
||||
if(keys[GLFW_KEY_A])
|
||||
camera.ProcessKeyboard(LEFT, deltaTime);
|
||||
if(keys[GLFW_KEY_D])
|
||||
camera.ProcessKeyboard(RIGHT, deltaTime);
|
||||
}
|
||||
|
||||
// Is called whenever a key is pressed/released via GLFW
|
||||
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode)
|
||||
{
|
||||
if(key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
|
||||
glfwSetWindowShouldClose(window, GL_TRUE);
|
||||
|
||||
if(action == GLFW_PRESS)
|
||||
keys[key] = true;
|
||||
else if(action == GLFW_RELEASE)
|
||||
keys[key] = false;
|
||||
}
|
||||
|
||||
void mouse_callback(GLFWwindow* window, double xpos, double ypos)
|
||||
{
|
||||
if(firstMouse)
|
||||
{
|
||||
lastX = xpos;
|
||||
lastY = ypos;
|
||||
firstMouse = false;
|
||||
}
|
||||
|
||||
GLfloat xoffset = xpos - lastX;
|
||||
GLfloat yoffset = lastY - ypos;
|
||||
|
||||
lastX = xpos;
|
||||
lastY = ypos;
|
||||
|
||||
camera.ProcessMouseMovement(xoffset, yoffset);
|
||||
}
|
||||
|
||||
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
|
||||
{
|
||||
camera.ProcessMouseScroll(yoffset);
|
||||
}
|
||||
|
||||
#pragma endregion
|
||||
Reference in New Issue
Block a user