Added GLEW support and shader are functional now
All fragments will be painted red
This commit is contained in:
Caesar2011
@@ -1,16 +1,15 @@
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// http://stackoverflow.com/questions/6005076/building-glew-on-windows-with-mingw
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#define GLEW_STATIC
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#include <GL/glew.h>
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#include <GLFW/glfw3.h>
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#include <SDL2/SDL.h>
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#include <SDL2/SDL_image.h>
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#include <stdio.h>
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#include <iostream>
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GLuint loadBMP_custom(const char * imagepath);
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void EnableTransparency()
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{
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glEnable(GL_BLEND);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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}
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#include <fstream>
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#include <vector>
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#include <stdexcept>
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GLuint LoadTexture(char *filename,int *textw,int *texth) {
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SDL_Surface *surface;
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@@ -71,19 +70,120 @@ void DrawTexture(int x, int y, GLuint textureid,int textw,int texth) {
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glDisable(GL_TEXTURE_2D );
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}
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GLuint LoadShaders(const char * vertex_file_path,const char * fragment_file_path){
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// Create the shaders
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GLuint VertexShaderID = glCreateShader(GL_VERTEX_SHADER);
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GLuint FragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
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// Read the Vertex Shader code from the file
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std::string VertexShaderCode;
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std::ifstream VertexShaderStream(vertex_file_path, std::ios::in);
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if(VertexShaderStream.is_open()){
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std::string Line = "";
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while(getline(VertexShaderStream, Line))
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VertexShaderCode += "\n" + Line;
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VertexShaderStream.close();
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}else{
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printf("Impossible to open %s. Are you in the right directory ? Don't forget to read the FAQ !\n", vertex_file_path);
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getchar();
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return 0;
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}
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// Read the Fragment Shader code from the file
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std::string FragmentShaderCode;
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std::ifstream FragmentShaderStream(fragment_file_path, std::ios::in);
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if(FragmentShaderStream.is_open()){
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std::string Line = "";
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while(getline(FragmentShaderStream, Line))
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FragmentShaderCode += "\n" + Line;
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FragmentShaderStream.close();
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}
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GLint Result = GL_FALSE;
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int InfoLogLength;
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// Compile Vertex Shader
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printf("Compiling shader : %s\n", vertex_file_path);
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char const * VertexSourcePointer = VertexShaderCode.c_str();
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glShaderSource(VertexShaderID, 1, &VertexSourcePointer , NULL);
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glCompileShader(VertexShaderID);
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// Check Vertex Shader
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glGetShaderiv(VertexShaderID, GL_COMPILE_STATUS, &Result);
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glGetShaderiv(VertexShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
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if ( InfoLogLength > 0 ){
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std::vector<char> VertexShaderErrorMessage(InfoLogLength+1);
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glGetShaderInfoLog(VertexShaderID, InfoLogLength, NULL, &VertexShaderErrorMessage[0]);
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printf("%s\n", &VertexShaderErrorMessage[0]);
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}
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// Compile Fragment Shader
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printf("Compiling shader : %s\n", fragment_file_path);
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char const * FragmentSourcePointer = FragmentShaderCode.c_str();
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glShaderSource(FragmentShaderID, 1, &FragmentSourcePointer , NULL);
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glCompileShader(FragmentShaderID);
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// Check Fragment Shader
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glGetShaderiv(FragmentShaderID, GL_COMPILE_STATUS, &Result);
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glGetShaderiv(FragmentShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
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if ( InfoLogLength > 0 ){
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std::vector<char> FragmentShaderErrorMessage(InfoLogLength+1);
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glGetShaderInfoLog(FragmentShaderID, InfoLogLength, NULL, &FragmentShaderErrorMessage[0]);
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printf("%s\n", &FragmentShaderErrorMessage[0]);
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}
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// Link the program
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printf("Linking program\n");
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GLuint ProgramID = glCreateProgram();
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glAttachShader(ProgramID, VertexShaderID);
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glAttachShader(ProgramID, FragmentShaderID);
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glLinkProgram(ProgramID);
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// Check the program
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glGetProgramiv(ProgramID, GL_LINK_STATUS, &Result);
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glGetProgramiv(ProgramID, GL_INFO_LOG_LENGTH, &InfoLogLength);
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if ( InfoLogLength > 0 ){
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std::vector<char> ProgramErrorMessage(InfoLogLength+1);
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glGetProgramInfoLog(ProgramID, InfoLogLength, NULL, &ProgramErrorMessage[0]);
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printf("%s\n", &ProgramErrorMessage[0]);
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}
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glDetachShader(ProgramID, VertexShaderID);
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glDetachShader(ProgramID, FragmentShaderID);
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glDeleteShader(VertexShaderID);
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glDeleteShader(FragmentShaderID);
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return ProgramID;
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}
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int main(int argc, char* args[]) {
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GLFWwindow* window;
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GLuint myglu;
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GLuint tex_jpe;
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GLuint tex_jpg;
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GLuint tex_gif;
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GLuint tex_png;
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GLuint tex_bmp;
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int textw, texth;
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int timer = 0;
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/* Initialize the library */
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/* GLFW */
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if (!glfwInit())
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return -1;
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/* SDL */
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if (SDL_Init(SDL_INIT_VIDEO) < 0)
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printf("SDL Error");
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if (!glfwInit()) {
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printf("GLFW Error");
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return 1;
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}
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/* Create a windowed mode window and its OpenGL context */
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window = glfwCreateWindow(640, 480, "Hello World", NULL, NULL);
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if (!window) {
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@@ -92,18 +192,54 @@ int main(int argc, char* args[]) {
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}
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/* Make the window's context current */
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glfwMakeContextCurrent(window);
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/* GLEW */
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glewExperimental = GL_FALSE;
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GLenum error = glGetError();
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if (error != GL_NO_ERROR)
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{
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std::cout << "OpenGL Error: " << error << std::endl;
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}
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GLenum glewinit = glewInit();
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if (glewinit != GLEW_OK) {
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std::cout << "Glew not okay! " << glewinit;
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return 1;
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}
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/* SDL */
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if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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printf("SDL Error");
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return 1;
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}
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// INIT
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myglu=LoadTexture("../img/tests/stones.bmp",&textw,&texth);
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tex_jpe=LoadTexture("../img/tests/test.jpeg",&textw,&texth);
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tex_jpg=LoadTexture("../img/tests/test.jpg",&textw,&texth);
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tex_png=LoadTexture("../img/tests/test.png",&textw,&texth);
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tex_bmp=LoadTexture("../img/tests/test.bmp",&textw,&texth);
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GLuint programID = LoadShaders("trimap.vertexshader", "trimap.fragmentshader");
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printf("%d", programID);
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// INIT END
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/* Loop until the user closes the window */
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while (!glfwWindowShouldClose(window)) {
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timer += 1;
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if (timer==800)
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timer = 0;
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/* Render here */
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glClear(GL_COLOR_BUFFER_BIT);
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// RENDER
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DrawTexture(50,50,myglu,textw,texth);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glUseProgram(programID);
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// RENDER
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if (timer<200)
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DrawTexture(50,50,tex_jpe,textw,texth);
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else if (timer<400)
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DrawTexture(50,50,tex_jpg,textw,texth);
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else if (timer<600)
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DrawTexture(50,50,tex_png,textw,texth);
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else
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DrawTexture(50,50,tex_bmp,textw,texth);
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// RENDER END
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/* Swap front and back buffers */
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