Program::Program(int files, char** fileNames, char *options) {
program = -1;
vertexShader = -1;
fragmentShader = -1;
const char **contents = (const char**) malloc((files + 2) * sizeof(char*));
int i;
for (i = 0; i < files; ++i) {
contents[i + 2] = readFile(fileNames[i]);
}
if (program == -1) {
program = glCreateProgram();
vertexShader = glCreateShader(GL_VERTEX_SHADER);
fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glAttachShader(program, vertexShader);
glAttachShader(program, fragmentShader);
assert(glGetError() == 0);
}
contents[0] = "#define _VERTEXSHADER_\n";
contents[1] = options == NULL ? "" : options;
glShaderSource(vertexShader, files + 2, contents, NULL);
glCompileShader(vertexShader);
checkShader(vertexShader);
assert(glGetError() == 0);
contents[0] = "#define _FRAGMENTSHADER_\n";
glShaderSource(fragmentShader, files + 2, contents, NULL);
glCompileShader(fragmentShader);
checkShader(fragmentShader);
assert(glGetError() == 0);
for (i = 0; i < files; ++i) {
free((void*) contents[i + 2]);
}
glBindAttribLocation(program, 1, "normal");
glBindAttribLocation(program, 2, "color");
glLinkProgram(program);
GLint logLength;
glGetProgramiv(program, GL_INFO_LOG_LENGTH, &logLength);
if (logLength > 0) {
char *log = new char[logLength];
glGetProgramInfoLog(program, logLength, &logLength, log);
printf("%s", log);
}
if (checkProgram(program)) {
assert(glGetError() == 0);
} else {
printShaderLog(vertexShader);
printShaderLog(fragmentShader);
// exit(-1);
}
}
GLuint setShaders(char * vert, char * frag)
{
GLuint v, f, pro;
char *vs, *fs;
v = glCreateShader(GL_VERTEX_SHADER);
f = glCreateShader(GL_FRAGMENT_SHADER);
vs = textFileRead(vert);
fs = textFileRead(frag);
const char * vv = vs;
const char * ff = fs;
glShaderSource(v, 1, &vv, NULL);
glShaderSource(f, 1, &ff, NULL);
free(vs); free(fs);
glCompileShader(v);
glCompileShader(f);
printShaderLog(v);
printShaderLog(f);
pro = glCreateProgram();
glAttachShader(pro, v);
glAttachShader(pro, f);
glLinkProgram(pro);
printProgramLog(pro);
return(pro);
}
/**
* Compiles all GLSL shaders
*/
void Resources::compileShaders() {
GLuint vert, frag; // Vertex and fragment shader handles
for(int i = 0; i < NUM_SHADERS; i++) {
// Create handles for program and shaders
programs[i] = glCreateProgram();
vert = glCreateShader(GL_VERTEX_SHADER);
frag = glCreateShader(GL_FRAGMENT_SHADER);
// Read shaders from files
char *vs_source = readShader(vertex_shaders[i]);
char *fs_source = readShader(fragment_shaders[i]);
// Loader shader sources
glShaderSource(vert, 1, (const char**)&vs_source, NULL);
glShaderSource(frag, 1, (const char**)&fs_source, NULL);
// Compile shaders
glCompileShader(vert);
printShaderLog(vert);
glCompileShader(frag);
printShaderLog(frag);
// Attach shaders to program
glAttachShader(programs[i], vert);
glAttachShader(programs[i], frag);
// Link program
glLinkProgram(programs[i]);
printProgramLog(programs[i]);
// Free memory from shader files
delete[] vs_source;
delete[] fs_source;
}
}
void setupShaders()
{
v = glCreateShader(GL_VERTEX_SHADER);
f = glCreateShader(GL_FRAGMENT_SHADER);
vs = textFileRead("shader.vert");
fs = textFileRead("shader.frag");
const char * ff = fs;
const char * vv = vs;
glShaderSource(v, 1, &vv, NULL);
glShaderSource(f, 1, &ff, NULL);
free(vs); free(fs);
glCompileShader(v);
glCompileShader(f);
printShaderLog(v);
printShaderLog(f);
p = glCreateProgram();
glAttachShader(p, f);
glAttachShader(p, v);
glLinkProgram(p);
printProgramLog(p);
}
//--------------------------------------------------------------
// compile OpenGL21 shader
GLuint mgWinGL21Support::compileShader(
const char* source,
GLenum shaderType)
{
// Create shader objects
GLuint shader = glCreateShader(shaderType);
const GLchar* strings[1];
strings[0] = (GLchar *) source;
glShaderSource(shader, 1, strings, NULL);
glCompileShader(shader);
mgDebug("%s shader log:", (shaderType == GL_VERTEX_SHADER) ? "vertex" : "fragment");
printShaderLog(shader);
// Check for errors
GLint testVal;
glGetShaderiv(shader, GL_COMPILE_STATUS, &testVal);
if (testVal == GL_FALSE)
{
mgDebug("%s shader compilation failed.", (shaderType == GL_VERTEX_SHADER) ? "vertex" : "fragment");
return 0;
}
return shader;
}
/**
* Compile the shader from file 'filename', with error handling
*/
int Shader::loadShader(string fileName){
GLint link_ok = GL_FALSE;
GLuint vs, fs;
string vsName = fileName+".v.glsl";
string fsName = fileName+".f.glsl";
if ((vs = createShader(vsName.c_str(), GL_VERTEX_SHADER)) == 0) return 0;
if ((fs = createShader(fsName.c_str(), GL_FRAGMENT_SHADER)) == 0) return 0;
program = glCreateProgram();
glAttachShader(program, vs);
glAttachShader(program, fs);
glLinkProgram(program);
glGetProgramiv(program, GL_LINK_STATUS, &link_ok);
if (!link_ok) {
logWar("glLinkProgram:");
printShaderLog(program);
glDeleteShader(vs);
glDeleteShader(fs);
return -1;
}
glDeleteShader(vs);
glDeleteShader(fs);
loadVars();
return 0;
}
GLuint AntSim::shaderLoadFromFile(std::string path, GLenum shaderType)
{
std::string stringShader;
std::ifstream fileShader(path.c_str());
if (fileShader)
{
stringShader.assign((std::istreambuf_iterator<char>(fileShader)), std::istreambuf_iterator<char>());
GLuint shader = glCreateShader(shaderType);
const GLchar* pntStringSource = stringShader.c_str();
glShaderSource(shader, 1, static_cast<const GLchar**>(&pntStringSource), 0);
glCompileShader(shader);
GLint shaderCompiled = GL_FALSE;
glGetShaderiv(shader, GL_COMPILE_STATUS, &shaderCompiled);
if (shaderCompiled != GL_TRUE)
{
std::cout << "Unable to compile shader " << shader << " (path: " << path << ")" << std::endl;
printShaderLog(shader);
glDeleteShader(shader);
return 0;
}
return shader;
}
else
{
std::cout << "Could not open file " << path.c_str() << std::endl;
return 0;
}
}
/**
* Compile the shader from file 'filename', with error handling
*/
GLuint Shader::createShader(const char* filename, GLenum type)
{
if(FileSystem::getInstance()->openFile(filename) == -1){
logErr("Error opening %s: ", filename);
return 0;
}
const char* source = FileSystem::getInstance()->getFileData(filename);
if (source == NULL) {
logErr("Error data %s: ", filename);
return 0;
}
logInf("filename shader: %s",filename);
GLuint res = glCreateShader(type);
glShaderSource(res, 1, &source, NULL);
FileSystem::getInstance()->destroyFileData(filename);
glCompileShader(res);
GLint compile_ok = GL_FALSE;
glGetShaderiv(res, GL_COMPILE_STATUS, &compile_ok);
if (compile_ok == GL_FALSE) {
logErr("%s:", filename);
printShaderLog(res);
glDeleteShader(res);
return 0;
}
return res;
}
void checkShader(GLuint s) {
GLint compiled;
glGetShaderiv(s, GL_COMPILE_STATUS, &compiled);
if (!compiled) {
printShaderLog(s);
// exit(-1);
}
}
//loades the shaders into a program, retruning the programs id
GLuint glslLoadShaderProgram( std::string vertex, std::string fragment ){
//a quick check
if( vertex.empty() || fragment.empty() ){
printf( "ERROR: Unable to load programs, program defined as NULL" );
return 0;
}
printf( "INFO: Loading Shaders %s %s\n", vertex.c_str(), fragment.c_str());
//temp ids
GLuint vsID, fsID, program;
//make the vertex shader
const char* vertex_data = ReadShaderFile( vertex );
vsID = glCreateShader( GL_VERTEX_SHADER );
glShaderSource( vsID, 1, &vertex_data, NULL );
glCompileShader( vsID );
printShaderLog( vsID );
delete [] vertex_data;
//make the fragment shader
const char * fragment_data = ReadShaderFile( fragment );
fsID = glCreateShader( GL_FRAGMENT_SHADER );
glShaderSource( fsID, 1, &fragment_data, NULL );
glCompileShader( fsID );
printShaderLog( fsID );
delete [] fragment_data;
//make and link the program
program = glCreateProgram();
glAttachShader( program, vsID );
glAttachShader( program, fsID );
glBindFragDataLocationEXT( program, 0, "pixelColor" );
glLinkProgram( program );
printProgramLog( program );
//and return, best of luck
return program;
}
void loadShaderFromSource(GLenum type, std::string sourcefile)
{
std::stringstream ss;
std::ifstream file(sourcefile.c_str());
std::string line;
if (file.is_open() && file.good())
{
getline(file, line);
// skip past whitespace at the beginning
while (file.good() && (strcmp(line.c_str(), "\n")==0 || strcmp(line.c_str(), "")==0))
{
getline(file, line);
}
// #define the shader type
switch (type)
{
case GL_FRAGMENT_SHADER:
ss << "#define _FRAGMENT_" << std::endl;
break;
case GL_VERTEX_SHADER:
ss << "#define _VERTEX_" << std::endl;
break;
case GL_GEOMETRY_SHADER:
ss << "#define _GEOMETRY_" << std::endl;
break;
case GL_TESS_CONTROL_SHADER:
ss << "#define _TESSCONTROL_" << std::endl;
break;
case GL_TESS_EVALUATION_SHADER:
ss << "#define _TESSEVAL_" << std::endl;
break;
default:
break;
}
ss << line << std::endl;
while (file.good())
{
getline(file, line);
ss << line << std::endl;
}
file.close();
// load into gl
std::string str = ss.str();
//printf("shader source is:\n%s\n", str);
const int length = str.length();
const char *text = str.c_str();
GLuint id = glCreateShader(type);
glShaderSource(id, 1, (const char **)&text, &length);
glCompileShader(id);
printShaderLog(id);
glAttachShader(g_shader.id, id);
glDeleteShader(id);
g_shader.progs.push_back(id);
}
}
GLuint Shader::compileShader(GLenum shader_type, const char* file_path)
{
std::string s = readFile(file_path);
const char* shader_src = s.c_str();
GLuint shader = glCreateShader(shader_type);
GLint len = s.length();
glShaderSource(shader, 1, &shader_src, &len);
glCompileShader(shader);
printShaderLog(shader, file_path);
return shader;
}
bool shaderProgram::loadProgramFromSource(const char *vertexSource, const char *fragmentSource) {
assert(vertexSource != nullptr);
assert(fragmentSource != nullptr);
programID = glCreateProgram();
GLint compiled = 0;
vertexShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertexShader, 1, &vertexSource, nullptr);
glCompileShader(vertexShader);
glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &compiled);
if (!compiled) {
printShaderLog(vertexShader, "vertex");
return false;
}
fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragmentShader, 1, &fragmentSource, nullptr);
glCompileShader(fragmentShader);
glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &compiled);
if (!compiled) {
printShaderLog(fragmentShader, "fragment");
return false;
}
glBindFragDataLocation(programID, 0, "color");
glAttachShader(programID, vertexShader);
glAttachShader(programID, fragmentShader);
glLinkProgram(programID);
bindAddresses();
return true;
}
GLuint createShaderFromSource(GLuint stype, const std::string& src)
{
GLuint S = glCreateShader(stype);
const GLchar* src_cstr = src.c_str();
glShaderSource(S, 1, &src_cstr, 0);
glCompileShader(S);
if(!check(S))
{
printShaderLog(S);
glDeleteShader(S);
return 0;
}
return S;
}
GLuint createShader(GLuint stype, const std::string& file)
{
string str = readShaderSource(file);
assert(!str.empty());
if(!str.empty())
{
GLuint shader = createShaderFromSource(stype, str);
if(!check(shader))
{
cerr << file << endl;
printShaderLog(shader);
glDeleteShader(shader);
return 0;
}
return shader;
}
return 0;
}
GLuint ShaderManager::loadShaderFromFile(std::string path, GLenum shaderType)
{
// Open file
GLuint shaderID = 0;
std::string shaderString;
std::ifstream sourceFile(path.c_str());
// Source file loaded
if (sourceFile)
{
// Get shader source
shaderString.assign((std::istreambuf_iterator< char >(sourceFile)), std::istreambuf_iterator< char >());
// Create shader ID
shaderID = glCreateShader(shaderType);
// Set shader source
const GLchar* shaderSource = shaderString.c_str();
glShaderSource(shaderID, 1, (const GLchar**)&shaderSource, NULL);
// Compile shader source
glCompileShader(shaderID);
// Check shader for errors
GLint shaderCompiled = GL_FALSE;
glGetShaderiv(shaderID, GL_COMPILE_STATUS, &shaderCompiled);
if (shaderCompiled != GL_TRUE)
{
printf("Unable to compile shader %d!\n\nSource:\n%s\n", shaderID, shaderSource);
printShaderLog(shaderID);
glDeleteShader(shaderID);
shaderID = 0;
}
}
else
{
printf("Unable to open file %s\n", path.c_str());
}
return shaderID;
}
GLuint ShaderManager::loadShaderFromFile( const string& filename, const GLenum& shaderType )
{
Log::InfoFmt(getClassName(), "Load from file \"%s\"", filename.c_str());
GLuint shader = 0;
string shaderString;
std::ifstream file(filename);
if (file)
{
shaderString.assign( (std::istreambuf_iterator<char>(file)), std::istreambuf_iterator<char>() );
shader = glCreateShader(shaderType);
const GLchar* shaderSource = shaderString.c_str();
glShaderSource(shader, 1, (const GLchar**)&shaderSource, NULL);
glCompileShader(shader);
GLint shaderCompiled = GL_FALSE;
glGetShaderiv(shader, GL_COMPILE_STATUS, &shaderCompiled);
if (shaderCompiled != GL_TRUE)
{
Log::ErrorFmt(getClassName(), "Failed to compile shader %d \"%s", shader, filename.c_str());
printShaderLog(shader);
glDeleteShader(shader);
shader = 0;
}
}
else
{
Log::ErrorFmt(getClassName(), "Unable to open file \"%s\"", filename.c_str());
return 0;
}
Log::InfoFmt(getClassName(), "Shader \"%s\" Loaded", filename.c_str());
return shader;
}
void Shader::addProgram(std::string text, int type)
{
int shader = glCreateShader(type); //actually a gluint
if (shader == 0)
{
//error
}
//Set source
const char *cstring = text.c_str();
glShaderSource(shader, 1, &cstring, NULL);
glCompileShader(shader);
GLint fShaderCompiled = GL_FALSE;
glGetShaderiv(shader, GL_COMPILE_STATUS, &fShaderCompiled);
if (fShaderCompiled != GL_TRUE)
{
printf("Unable to compile fragment shader %d!\n", shader);
printShaderLog(shader);
//success = false;
}
/*
//GLint status = 0;
//glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
if (status == 0)
{
//glGetShaderInfoLog(shader, )
}
*/
glAttachShader(gProgramID, shader);
}
bool MD5::loadShader(const char* vshader, const char* fshader)
{
GLuint vertShader;
GLuint fragShader;
GLint vsSize;
GLint fsSize;
char* vsBuffer;
char* fsBuffer;
// Load Vertex Shader
FILE* vs = fopen(vshader, "r");
if(NULL == vs)
{
fprintf(stderr, "Cannot open vertex shader\n");
return false;
}
fseek(vs, 0, SEEK_END);
vsSize = ftell(vs);
rewind(vs);
vsBuffer = new char[vsSize];
if(0 == vsBuffer)
return false;
if(vsSize != fread(vsBuffer, 1, vsSize, vs))
return false;
fclose(vs);
// Load Fragment Shader
FILE* fs = fopen(fshader, "r");
if(NULL == fs)
{
fprintf(stderr, "Cannot open fragment shader\n");
return false;
}
fseek(fs, 0, SEEK_END);
fsSize = ftell(fs);
rewind(fs);
fsBuffer = new char[fsSize];
if(0 == fsBuffer)
return false;
if(fsSize != fread(fsBuffer, 1, fsSize, fs))
return false;
// Create Vertex and Fragment Shaders
vertShader = glCreateShader(GL_VERTEX_SHADER);
fragShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(vertShader, 1, (const GLchar**)&vsBuffer, &vsSize);
glShaderSource(fragShader, 1, (const GLchar**)&fsBuffer, &fsSize);
//Compile Shaders
GLint compiled;
glCompileShader(vertShader);
glGetShaderiv(vertShader, GL_COMPILE_STATUS, &compiled);
if(compiled == false)
{
fprintf(stderr, "Vert Shader failed to compile\n");
printShaderLog(vertShader);
glDeleteShader(vertShader);
vertShader = 0;
glDeleteShader(fragShader);
fragShader = 0;
return false;
}
glCompileShader(fragShader);
glGetShaderiv(fragShader, GL_COMPILE_STATUS, &compiled);
if(compiled == false)
{
fprintf(stderr, "Frag Shader failed to compile\n");
printShaderLog(fragShader);
glDeleteShader(vertShader);
vertShader = 0;
glDeleteShader(fragShader);
fragShader = 0;
return false;
}
// Create and link GLSL program
shaderProgram = glCreateProgram();
glAttachShader(shaderProgram, vertShader);
glAttachShader(shaderProgram, fragShader);
GLint linked;
glLinkProgram(shaderProgram);
glGetProgramiv(shaderProgram, GL_LINK_STATUS, &linked);
if(linked == false)
{
fprintf(stderr, "Program linking failed\n");
glDetachShader(shaderProgram, vertShader);
glDetachShader(shaderProgram, fragShader);
glDeleteShader(vertShader);
glDeleteShader(fragShader);
vertShader = 0;
fragShader = 0;
shaderProgram = 0;
return false;
}
if(!GLEW_ARB_uniform_buffer_object)
{
jpLoc = glGetUniformLocation(shaderProgram, "jPos");
joLoc = glGetUniformLocation(shaderProgram, "jOrt");
}
mvpLoc = glGetUniformLocation(shaderProgram, "mvpMatrix");
// Clean up
glDeleteShader(vertShader);
glDeleteShader(fragShader);
delete vsBuffer;
delete fsBuffer;
return true;
}
bool InitializeShader(Shader_T *s, const char *vsfile, const char *fsfile)
{
bool success = true;
GLuint vertexShader;
GLuint fragmentShader;
GLint vShaderCompiled = GL_FALSE;
GLint fShaderCompiled = GL_FALSE;
GLint programSuccess = GL_TRUE;
GLchar *txt;
unsigned long len;
//Generate program
s->id = glCreateProgram();
s->vertex_attrib = -1;
s->uv_attrib = -1;
//Create vertex shader
vertexShader = glCreateShader( GL_VERTEX_SHADER );
//Set vertex source
LoadShaderSource(vsfile, &txt, &len);
glShaderSource( vertexShader, 1, &txt, NULL );
//Compile vertex source
glCompileShader( vertexShader );
ValidateShader(vertexShader, vsfile);
UnloadShaderSource(&txt);
//Check vertex shader for errors
glGetShaderiv( vertexShader, GL_COMPILE_STATUS, &vShaderCompiled );
if( vShaderCompiled != GL_TRUE )
{
printf( "Unable to compile vertex shader %d!\n", vertexShader );
printShaderLog( vertexShader );
success = false;
}
else
{
//Attach vertex shader to program
glAttachShader( s->id, vertexShader );
//Create fragment shader
LoadShaderSource(fsfile, &txt, &len);
fragmentShader = glCreateShader( GL_FRAGMENT_SHADER );
//Set fragment source
glShaderSource( fragmentShader, 1, &txt, NULL );
//Compile fragment source
glCompileShader( fragmentShader );
ValidateShader(fragmentShader, fsfile);
UnloadShaderSource(&txt);
//Check fragment shader for errors
glGetShaderiv( fragmentShader, GL_COMPILE_STATUS, &fShaderCompiled );
if( fShaderCompiled != GL_TRUE )
{
printf( "Unable to compile fragment shader %d!\n", fragmentShader );
printShaderLog( fragmentShader );
success = false;
}
else
{
//Attach fragment shader to program
glAttachShader( s->id, fragmentShader );
//Link program
glLinkProgram( s->id );
//Check for errors
glGetProgramiv( s->id, GL_LINK_STATUS, &programSuccess );
if( programSuccess != GL_TRUE )
{
printf( "Error linking program %d!\n", s->id );
printProgramLog( s->id );
success = false;
}
else
{
//Get vertex attribute location
s->uv_attrib = glGetAttribLocation( s->id, "vertexUV" );
s->vertex_attrib = glGetAttribLocation( s->id, "vertexPosition" );
if( s->vertex_attrib == -1 )
{
printf( "vertexPosition is not a valid glsl program variable!\n" );
success = false;
}
if(s->uv_attrib == -1 )
{
printf( "vertexTex is not a valid glsl program variable!\n" );
success = false;
}
}
}
}
return success;
}
void Shader::TestRemove()
{
//Success flag
bool success = true;
//Generate program
gProgramID = glCreateProgram();
//Create vertex shader
GLuint vertexShader = glCreateShader(GL_VERTEX_SHADER);
//Get vertex source
const GLchar* vertexShaderSource[] =
{
"#version 140\nin vec2 LVertexPos2D; void main() { gl_Position = vec4( LVertexPos2D.x, LVertexPos2D.y, 0, 1 ); }"
};
//Set vertex source
glShaderSource(vertexShader, 1, vertexShaderSource, NULL);
//Compile vertex source
glCompileShader(vertexShader);
//Check vertex shader for errors
GLint vShaderCompiled = GL_FALSE;
glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &vShaderCompiled);
if (vShaderCompiled != GL_TRUE)
{
printf("Unable to compile vertex shader %d!\n", vertexShader);
printShaderLog(vertexShader);
success = false;
}
//Attach vertex shader to program
glAttachShader(gProgramID, vertexShader);
//Create fragment shader
GLuint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
//Get fragment source
const GLchar* fragmentShaderSource[] =
{
"#version 140\nout vec4 LFragment; void main() { LFragment = vec4( 1.0, 0.0, 1.0, 1.0 ); }"
};
//Set fragment source
glShaderSource(fragmentShader, 1, fragmentShaderSource, NULL);
//Compile fragment source
glCompileShader(fragmentShader);
//Check fragment shader for errors
GLint fShaderCompiled = GL_FALSE;
glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &fShaderCompiled);
if (fShaderCompiled != GL_TRUE)
{
printf("Unable to compile fragment shader %d!\n", fragmentShader);
printShaderLog(fragmentShader);
success = false;
}
//Attach fragment shader to program
glAttachShader(gProgramID, fragmentShader);
//Link program
glLinkProgram(gProgramID);
//Check for errors
GLint programSuccess = GL_TRUE;
glGetProgramiv(gProgramID, GL_LINK_STATUS, &programSuccess);
if (programSuccess != GL_TRUE)
{
printf("Error linking program %d!\n", gProgramID);
printProgramLog(gProgramID);
success = false;
}
//Initialize clear color
glClearColor(1.f, 0.f, 0.f, 1.f);
}
bool initGL()
{
bool success = true;
//Generate program
gProgramID = glCreateProgram();
//Create vertex shader
GLuint vertexShader = glCreateShader(GL_VERTEX_SHADER);
//Get vertex source
const GLchar* vertexShaderSource[] =
{
"#version 140\nin vec2 LVertexPos2D; void main(){gl_Position = vec4( LVertexPos2D.x, LVertexPos2D.y, 0, 1 ); }"
};
//Set vertex shource
glShaderSource(vertexShader, 1, vertexShaderSource, NULL);
//Compile vertex source
glCompileShader(vertexShader);
//Check vertex shader for errors
GLint vShaderCompiled = GL_FALSE;
glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &vShaderCompiled);
if (vShaderCompiled != GL_TRUE)
{
printf("Unable to compile vertext shader %d!\n", vertexShader);
printShaderLog(vertexShader);
success = false;
}
else
{
//Attach vertext shader to program
glAttachShader(gProgramID, vertexShader);
//Create fragment shader
GLuint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
//Get fragment source
const GLchar* fragmentShaderSource[] =
{
"#version 140\nout vec4 LFragment; void main(){LFragment = vec4( 1.0, 1.0, 1.0, 1.0);}"
};
//Set fragment source
glShaderSource(fragmentShader, 1, fragmentShaderSource, NULL);
//Compile fragment source
glCompileShader(fragmentShader);
//Check fragment shader for errors
GLint fShaderCompiled = GL_FALSE;
glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &fShaderCompiled);
if (fShaderCompiled != GL_TRUE)
{
printf("Unable to compile fragment shader %d!\n", fragmentShader);
printShaderLog(fragmentShader);
success = false;
}
else
{
//Attach fragment shader to program
glAttachShader(gProgramID, fragmentShader);
//Link program
glLinkProgram(gProgramID);
//Check for errors
GLint programSuccess = GL_TRUE;
glGetProgramiv(gProgramID, GL_LINK_STATUS, &programSuccess);
if (programSuccess != GL_TRUE)
{
printf("Error linking program %d\n", gProgramID);
printProgramLog(gProgramID);
success = false;
}
else
{
//Get vertext attribute location
gVertexPos2DLocation = glGetAttribLocation(gProgramID, "LVertexPos2D");
if (gVertexPos2DLocation == -1)
{
printf("LVertexPos2D is not a valid glsl program variable!\n");
success = false;
}
else
{
//Initalize clear color
glClearColor(0.f, 0.f, 0.f, 1.f);
//VBO data
GLfloat vertexData[] =
{
-0.5f, -0.5f,
0.5f, -0.5f,
0.5f, 0.5f,
-0.5f, 0.5f
};
//IBO data
GLuint indexData[] = { 0,1,2,3 };
//Create VBO
glGenBuffers(1, &gVBO);
glBindBuffer(GL_ARRAY_BUFFER, gVBO);
glBufferData(GL_ARRAY_BUFFER, 2 * 4 * sizeof(GLfloat), vertexData, GL_STATIC_DRAW);
//Create IBO
glGenBuffers(1, &gIBO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, gIBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, 4 * sizeof(GLuint), indexData, GL_STATIC_DRAW);
}//end gVertexPos2DLocation
}//end program success
}//end if fShaderCopiled
}//end vShader compiled
return success;
}
Text::Text(FT_Face face, int height){
c = new glyphData[256];
color = glm::vec4(0.0f,0.0f,0.0f,1.0f);
cIndex = 0;
GLuint vs, fs;
GLint compile_ok = GL_FALSE, link_ok = GL_FALSE;
if(FileSystem::getInstance()->openFile("text.v.glsl") == -1){
logErr("Error opening text.v.glsl");
return;
}
if(FileSystem::getInstance()->openFile("text.f.glsl") == -1){
logErr("Error opening text.f.glsl");
return;
}
const char* source = FileSystem::getInstance()->getFileData("text.v.glsl");
if (source == NULL){
logErr("Error data text.v.glsl");
return;
}
vs = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vs, 1, &source, NULL);
glCompileShader(vs);
compile_ok = GL_FALSE;
glGetShaderiv(vs, GL_COMPILE_STATUS, &compile_ok);
if(compile_ok == GL_FALSE){
logErr("text.v.glsl");
printShaderLog(vs);
glDeleteShader(vs);
return;
}
source = FileSystem::getInstance()->getFileData("text.f.glsl");
if(source == NULL){
logErr("Error data text.f.glsl");
return;
}
fs = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fs, 1, &source, NULL);
glCompileShader(fs);
compile_ok = GL_FALSE;
glGetShaderiv(fs, GL_COMPILE_STATUS, &compile_ok);
if(compile_ok == GL_FALSE){
logErr("text.v.glsl");
printShaderLog(fs);
glDeleteShader(fs);
return;
}
programText = glCreateProgram();
glAttachShader(programText, vs);
glAttachShader(programText, fs);
glLinkProgram(programText);
glDeleteShader(vs);//these are marked to delete but until they are attached to the program, they will remain
glDeleteShader(fs);
glGetProgramiv(programText, GL_LINK_STATUS, &link_ok);
if(!link_ok){
logWar("glLinkProgram:");
return;
}
std::string attributeName = "coord";
attribute_coord = glGetAttribLocation(programText, attributeName.c_str());
if(attribute_coord == -1){
logErr("Could not bind attribute %s\n", attributeName.c_str());
return;
}
attributeName = "tex";
uniform_tex = glGetUniformLocation(programText, attributeName.c_str());
if(uniform_tex == -1){
logErr("Could not bind uniform %s\n", attributeName.c_str());
return;
}
attributeName = "color";
uniform_color = glGetUniformLocation(programText, attributeName.c_str());
if(uniform_color == -1){
logErr("Could not bind uniform %s\n", attributeName.c_str());
return;
}
attributeName = "pvmMatrix";
uniform_pvmMatrix = glGetUniformLocation(programText, attributeName.c_str());
if(uniform_pvmMatrix == -1){
logErr("Could not bind uniform %s\n", attributeName.c_str());
return;
}
vbo = 0;
FT_Set_Pixel_Sizes(face, 0, height);
FT_GlyphSlot g = face->glyph;
int roww = 0;
int rowh = 0;
w = 0;
h = 0;
memset(c, 0, sizeof(glyphData) * 256);
/* Find minimum size for a texture holding all visible ASCII characters */
for(int i = 32; i < 256; i++){
if(FT_Load_Char(face, i, FT_LOAD_RENDER)){
logErr("Loading character %c failed!\n", i);
continue;
}
if(roww + g->bitmap.width + 1 >= MAXWIDTH){
w = std::max(w, roww);
h += rowh;
roww = 0;
rowh = 0;
}
roww += g->bitmap.width + 1;
rowh = std::max(rowh, g->bitmap.rows);
}
maxHeight = rowh;
w = std::max(w, roww);
h += rowh;
/* Create a texture that will be used to hold all ASCII glyphs */
glActiveTexture(GL_TEXTURE0);
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, w, h, 0, GL_ALPHA, GL_UNSIGNED_BYTE, 0);
/* We require 1 byte alignment when uploading texture data */
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
/* Clamping to edges is important to prevent artifacts when scaling */
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
/* Linear filtering usually looks best for text */
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
/* Paste all glyph bitmaps into the texture, remembering the offset */
int ox = 0;
int oy = 0;
rowh = 0;
for(int i = 32; i < 256; i++){
if(FT_Load_Char(face, i, FT_LOAD_RENDER)){
logErr("Loading character %c failed!\n", i);
continue;
}
if(ox + g->bitmap.width + 1 >= MAXWIDTH){
oy += rowh+1;
rowh = 0;
ox = 0;
}
glTexSubImage2D(GL_TEXTURE_2D, 0, ox, oy, g->bitmap.width, g->bitmap.rows, GL_ALPHA, GL_UNSIGNED_BYTE, g->bitmap.buffer);
c[i].ax = g->advance.x >> 6;
c[i].ay = g->advance.y >> 6;
c[i].bw = g->bitmap.width;
c[i].bh = g->bitmap.rows;
c[i].bl = g->bitmap_left;
c[i].bt = g->bitmap_top;
c[i].tx = ox / (float)w;
c[i].ty = oy / (float)h;
rowh = std::max(rowh, g->bitmap.rows);
ox += g->bitmap.width + 1;
}
logErr("Generated a %d x %d (%d kb) texture atlas\n", w, h, w * h / 1024);
atlasWidth = w;
atlasHeight = h;
}
// Loads files [files] in string table, builds program object, compile shaders in shaders objects, links and return the id program object (with the executable code)
unsigned int Shaders::loadProgram(const std::vector<std::string> &files) const
{
// Creates a program object which id is returned
unsigned int programId=glCreateProgram();
glBindAttribLocation(programId, 0, "vertexPosition");
glBindAttribLocation(programId, 1, "vertexNormal");
glBindAttribLocation(programId, 2, "vertexUvs");
glBindAttribLocation(programId, 3, "vertexColor");
// Creates a vertex shader object which id is returned
unsigned int vertexShaderId=glCreateShader(GL_VERTEX_SHADER);
// Creates a fragment shader object which id is returned
unsigned int fragmentShaderId=glCreateShader(GL_FRAGMENT_SHADER);
glAttachShader(programId, vertexShaderId);
glAttachShader(programId, fragmentShaderId);
unsigned int n=files.size();
std::string ** strs=new std::string*[n];
const char ** lines=new const char*[n+2];
//std::cout<<"Loading program "<<files[n - 1]<<"..."<<std::endl;
bool geo=false;
// For every file :
for (unsigned int i=0 ; i<n ; ++i)
{
// Gets std::string of file
std::string* s=loadFile(files[i]);
// Stores it [std::string] in strs[i]
strs[i]=s;
// Stores it [char] in lines[i+2]
lines[i+2]=s->c_str();
// If _GEOMETRY_ is in file, geometrey shader : geo=true
// strstr(a, b)-> finds firt occurence of b in a
if (strstr(lines[i+2], "_GEOMETRY_")!=NULL)
geo=true;
}
lines[0]="#version 150\n";
lines[1]="#define _VERTEX_\n";
// Loads shader source chars in shader object
glShaderSource(vertexShaderId, n+2, lines, NULL);
// Compiles the loaded shader source code
glCompileShader(vertexShaderId);
// Prints compilation potential problems
printShaderLog(vertexShaderId);
if (geo)
{
// Creates a geometry shader object which id is returned
unsigned int geometryShaderId=glCreateShader(GL_GEOMETRY_SHADER_EXT);
glAttachShader(programId, geometryShaderId);
// Adds this text before the source text
lines[1]="#define _GEOMETRY_\n";
glShaderSource(geometryShaderId, n+2, lines, NULL);
glCompileShader(geometryShaderId);
printShaderLog(geometryShaderId);
// Specifies type of primitives accessible in geometry shader
glProgramParameteriEXT(programId, GL_GEOMETRY_INPUT_TYPE_EXT, GL_TRIANGLES);
}
lines[1]="#define _FRAGMENT_\n";
glShaderSource(fragmentShaderId, n+2, lines, NULL);
glCompileShader(fragmentShaderId);
printShaderLog(fragmentShaderId);
// Links the program object to build the executable code
glLinkProgram(programId);
for (unsigned int i=0 ; i<n ; ++i)
delete strs[i];
delete[] strs;
delete[] lines;
// Returns the ID of the program object
return programId;
}
