278 lines
10 KiB
C++
278 lines
10 KiB
C++
#include "shader.h"
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#include <iostream>
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#ifdef __APPLE__
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#include "CoreFoundation/CoreFoundation.h"
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#include <OpenGL/OpenGL.h>
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#if ESSENTIAL_GL_PRACTICES_SUPPORT_GL3
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#include <OpenGL/gl3.h>
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#else
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#include <OpenGL/gl.h>
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#endif //!ESSENTIAL_GL_PRACTICES_SUPPORT_GL3
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#else
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#include <SDL3/SDL_opengl.h>
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#include <SDL3/SDL_opengl_glext.h>
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#endif
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namespace shader
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{
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SDL_Window *win = nullptr;
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SDL_Renderer *renderer = nullptr;
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GLuint programId = 0;
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SDL_Texture* backBuffer = nullptr;
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SDL_FRect window = {0, 0, 640, 480};
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SDL_FPoint tex_size = {320, 240};
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float aspect_ratio = 1;
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bool can_use_opengl = false;
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bool using_opengl = false;
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GLuint texture_number;
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GLuint nose;
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#ifndef __APPLE__
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// I'm avoiding the use of GLEW or some extensions handler, but that
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// doesn't mean you should...
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PFNGLCREATESHADERPROC glCreateShader;
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PFNGLSHADERSOURCEPROC glShaderSource;
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PFNGLCOMPILESHADERPROC glCompileShader;
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PFNGLGETSHADERIVPROC glGetShaderiv;
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PFNGLGETSHADERINFOLOGPROC glGetShaderInfoLog;
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PFNGLDELETESHADERPROC glDeleteShader;
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PFNGLATTACHSHADERPROC glAttachShader;
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PFNGLCREATEPROGRAMPROC glCreateProgram;
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PFNGLDELETEPROGRAMPROC glDeleteProgram;
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PFNGLLINKPROGRAMPROC glLinkProgram;
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PFNGLVALIDATEPROGRAMPROC glValidateProgram;
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PFNGLGETPROGRAMIVPROC glGetProgramiv;
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PFNGLGETPROGRAMINFOLOGPROC glGetProgramInfoLog;
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PFNGLUSEPROGRAMPROC glUseProgram;
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PFNGLGETUNIFORMLOCATIONPROC glGetUniformLocation;
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PFNGLUNIFORM2FPROC glUniform2f;
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bool initGLExtensions() {
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glCreateShader = (PFNGLCREATESHADERPROC)SDL_GL_GetProcAddress("glCreateShader");
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glShaderSource = (PFNGLSHADERSOURCEPROC)SDL_GL_GetProcAddress("glShaderSource");
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glCompileShader = (PFNGLCOMPILESHADERPROC)SDL_GL_GetProcAddress("glCompileShader");
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glGetShaderiv = (PFNGLGETSHADERIVPROC)SDL_GL_GetProcAddress("glGetShaderiv");
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glGetShaderInfoLog = (PFNGLGETSHADERINFOLOGPROC)SDL_GL_GetProcAddress("glGetShaderInfoLog");
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glDeleteShader = (PFNGLDELETESHADERPROC)SDL_GL_GetProcAddress("glDeleteShader");
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glAttachShader = (PFNGLATTACHSHADERPROC)SDL_GL_GetProcAddress("glAttachShader");
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glCreateProgram = (PFNGLCREATEPROGRAMPROC)SDL_GL_GetProcAddress("glCreateProgram");
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glDeleteProgram = (PFNGLDELETEPROGRAMPROC)SDL_GL_GetProcAddress("glDeleteProgram");
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glLinkProgram = (PFNGLLINKPROGRAMPROC)SDL_GL_GetProcAddress("glLinkProgram");
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glValidateProgram = (PFNGLVALIDATEPROGRAMPROC)SDL_GL_GetProcAddress("glValidateProgram");
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glGetProgramiv = (PFNGLGETPROGRAMIVPROC)SDL_GL_GetProcAddress("glGetProgramiv");
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glGetProgramInfoLog = (PFNGLGETPROGRAMINFOLOGPROC)SDL_GL_GetProcAddress("glGetProgramInfoLog");
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glUseProgram = (PFNGLUSEPROGRAMPROC)SDL_GL_GetProcAddress("glUseProgram");
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glGetUniformLocation = (PFNGLGETUNIFORMLOCATIONPROC)SDL_GL_GetProcAddress("glGetUniformLocation");
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glUniform2f = (PFNGLUNIFORM2FPROC)SDL_GL_GetProcAddress("glUniform2f");
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return glCreateShader && glShaderSource && glCompileShader && glGetShaderiv &&
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glGetShaderInfoLog && glDeleteShader && glAttachShader && glCreateProgram &&
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glDeleteProgram && glLinkProgram && glValidateProgram && glGetProgramiv &&
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glGetProgramInfoLog && glUseProgram && glGetUniformLocation && glUniform2f;
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}
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#endif
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GLuint compileShader(const char* source, GLuint shaderType) {
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// Create ID for shader
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GLuint result = glCreateShader(shaderType);
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// Add define depending on shader type
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const char *sources[2] = { shaderType==GL_VERTEX_SHADER?"#define VERTEX\n":"#define FRAGMENT\n", source };
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// Define shader text
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glShaderSource(result, 2, sources, NULL);
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// Compile shader
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glCompileShader(result);
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//Check vertex shader for errors
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GLint shaderCompiled = GL_FALSE;
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glGetShaderiv( result, GL_COMPILE_STATUS, &shaderCompiled );
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if (shaderCompiled != GL_TRUE)
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{
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std::cout << "Error en la compilación: " << result << "!" << std::endl;
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GLint logLength;
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glGetShaderiv(result, GL_INFO_LOG_LENGTH, &logLength);
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if (logLength > 0)
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{
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GLchar *log = (GLchar*)malloc(logLength);
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glGetShaderInfoLog(result, logLength, &logLength, log);
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std::cout << "Shader compile log:" << log << std::endl;
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//std::cout << source << std::endl;
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free(log);
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}
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glDeleteShader(result);
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result = 0;
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}
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return result;
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}
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GLuint compileProgram(const char* vertexShaderSource, const char* fragmentShaderSource)
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{
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GLuint programId = 0;
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GLuint vtxShaderId, fragShaderId;
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if (programId != 0) glDeleteProgram(programId);
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programId = glCreateProgram();
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vtxShaderId = compileShader(vertexShaderSource, GL_VERTEX_SHADER);
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fragShaderId = compileShader(fragmentShaderSource?fragmentShaderSource:vertexShaderSource, GL_FRAGMENT_SHADER);
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if(vtxShaderId && fragShaderId)
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{
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// Associate shader with program
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glAttachShader(programId, vtxShaderId);
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glAttachShader(programId, fragShaderId);
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glLinkProgram(programId);
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glValidateProgram(programId);
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// Check the status of the compile/link
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GLint logLen;
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glGetProgramiv(programId, GL_INFO_LOG_LENGTH, &logLen);
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if (logLen > 0)
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{
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char* log = (char*) malloc(logLen * sizeof(char));
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// Show any errors as appropriate
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glGetProgramInfoLog(programId, logLen, &logLen, log);
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std::cout << "Prog Info Log: " << std::endl << log << std::endl;
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free(log);
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}
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}
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if (vtxShaderId) glDeleteShader(vtxShaderId);
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if (fragShaderId) glDeleteShader(fragShaderId);
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return programId;
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}
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const bool init(SDL_Window* win, SDL_Texture* backBuffer, const char* vertexShader, const char* fragmentShader)
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{
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shader::win = win;
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shader::renderer = SDL_GetRenderer(win);
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shader::backBuffer = backBuffer;
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int w, h;
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SDL_GetWindowSize(win, &w, &h);
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if (w * aspect_ratio > h) {
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window.y = 0;
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window.h = h;
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window.w = h/aspect_ratio;
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window.x = (w - window.w)/2;
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} else {
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window.x = 0;
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window.w = w;
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window.h = w*aspect_ratio;
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window.y = (h - window.h)/2;
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}
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SDL_GetTextureSize(backBuffer, &tex_size.x, &tex_size.y);
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printf("tex size: %fx%f\n", tex_size.x, tex_size.y);
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SDL_PropertiesID props = SDL_GetTextureProperties(backBuffer);
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texture_number = SDL_GetNumberProperty(props, SDL_PROP_TEXTURE_OPENGL_TEXTURE_NUMBER, -1);
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printf("texture number: %i\n", texture_number);
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int access = SDL_GetNumberProperty(props, SDL_PROP_TEXTURE_ACCESS_NUMBER, -1);
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nose = SDL_GetNumberProperty(props, SDL_PROP_TEXTURE_OPENGL_TEXTURE_TARGET_NUMBER, -1);
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printf("texture target number: %i\n", nose);
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if (access != SDL_TEXTUREACCESS_TARGET)
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{
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std::cout << "ERROR FATAL: La textura per al render ha de tindre SDL_TEXTUREACCESS_TARGET definit." << std::endl;
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exit(1);
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}
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const char * renderer_name = SDL_GetRendererName(renderer);
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printf("rendererInfo.name: %s\n", renderer_name);
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if(!strncmp(renderer_name, "opengl", 6)) {
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#ifndef __APPLE__
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static bool gl_extensions_initialized = false;
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if (!gl_extensions_initialized) {
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if (!initGLExtensions()) {
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std::cout << "WARNING: No s'han pogut inicialitzar les extensions d'OpenGL!" << std::endl;
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can_use_opengl = false;
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return false;
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}
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gl_extensions_initialized = true;
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}
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#endif
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// Compilar el shader y dejarlo listo para usar.
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if (!vertexShader) {
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can_use_opengl = false;
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return false;
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}
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programId = compileProgram(vertexShader, fragmentShader);
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} else {
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std::cout << "WARNING: El driver del renderer no es OpenGL." << std::endl;
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can_use_opengl = false;
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return false;
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}
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can_use_opengl = true;
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return true;
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}
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unsigned char pixels[512*240*4];
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void enable() { if (can_use_opengl) using_opengl = true; }
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void disable() { using_opengl = false; }
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void setAspectRatio(const float ratio)
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{
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aspect_ratio = ratio;
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}
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void render()
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{
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SDL_FlushRenderer(renderer);
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SDL_SetRenderTarget(renderer, NULL);
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SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
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SDL_RenderClear(renderer);
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SDL_FlushRenderer(renderer);
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if (using_opengl)
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{
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GLint oldProgramId;
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if (programId != 0)
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{
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glGetIntegerv(GL_CURRENT_PROGRAM, &oldProgramId);
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glUseProgram(programId);
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}
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//GLint loc = glGetUniformLocation(programId, "TextureSize");
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//glUniform2f(loc, 320, 256);
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glEnable(GL_TEXTURE_2D);
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, 1);
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//glGetTexImage(GL_TEXTURE_2D, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8, pixels);
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//if (glGetError()) { printf("GLGETERROR!\n"); exit(1);}
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//GLint param;
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//glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, ¶m);
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//printf("tex width: %i\n", param);
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glViewport(window.x, window.y, window.w, window.h);
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glBegin(GL_TRIANGLE_STRIP);
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glTexCoord2f(0.0f, 0.0f);
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glVertex2f(-1.0f, -1.0f);
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glTexCoord2f(tex_size.x, 0.0f);
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glVertex2f(1.0f, -1.0f);
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glTexCoord2f(0.0f, tex_size.y);
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glVertex2f(-1.0f, 1.0f);
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glTexCoord2f(tex_size.x, tex_size.y);
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glVertex2f(1.0f, 1.0f);
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glEnd();
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SDL_GL_SwapWindow(win);
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if (programId != 0) glUseProgram(oldProgramId);
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} else {
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SDL_RenderTexture(renderer, backBuffer, NULL, &window);
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SDL_RenderPresent(renderer);
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}
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int glerror = glGetError();
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if (glerror) { printf("GLERROR: %i\n", glerror); exit(1); }
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}
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}
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