// On successful return, the returned program object ID can be
// used to install the program as part of current state
// using glUseProgram(). Example:
//
// GLuint prog = makeShaderProgramFromFiles( vertShaderFile, fragShaderFile,
// myBindAttribLocFunc );
// if ( prog != 0 )
// {
// glUseProgram( prog );
//
// // Set values of uniform variables only
// // after the prog has become current.
// glUniform3f( getUniLoc(prog, "LightPosition"), 10.0, 10.0, 15.0 );
// printOpenGLError();
// glUniform1f( getUniLoc(prog, "Density"), 16.0 );
// printOpenGLError();
// }
//
// Use glUseProgram(0) to restore the original vertex processing
// and fragement processing fixed functionalities.
//
/////////////////////////////////////////////////////////////////////////////
GLuint makeShaderProgramFromFiles( const char *vertShaderSrcFilename,
const char *fragShaderSrcFilename,
void (*bindAttribLocFunc)( GLuint progObj ) )
{
// Read shaders' source files.
GLchar *vertSrc = NULL, *fragSrc = NULL;
if ( vertShaderSrcFilename != NULL )
if ( readShaderSource( vertShaderSrcFilename, &vertSrc ) == 0 )
{
free( vertSrc ); free( fragSrc );
return 0;
}
if ( fragShaderSrcFilename != NULL )
if ( readShaderSource( fragShaderSrcFilename, &fragSrc ) == 0 )
{
free( vertSrc ); free( fragSrc );
return 0;
}
// Create shader program object.
GLuint shaderProg = makeShaderProgram( vertSrc, fragSrc, bindAttribLocFunc);
free( vertSrc ); free( fragSrc );
return shaderProg;
}
int main( int argc, char **argv )
{
int success = 0;
int gl_major, gl_minor;
GLchar *VertexShaderSource, *FragmentShaderSource;
glutInit( &argc, argv );
glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
glutInitWindowSize(500, 500);
window = glutCreateWindow( "3Dlabs Brick Shader");
glutIdleFunc(play);
glutDisplayFunc(display);
glutKeyboardFunc(key);
glutReshapeFunc(reshape);
glutMotionFunc(motion);
glutMouseFunc(mouse);
glutSpecialFunc(special);
glutTimerFunc(TIMER_FREQUENCY_MILLIS , timer, 0);
// Initialize the "OpenGL Extension Wrangler" library
glewInit();
// Make sure that OpenGL 2.0 is supported by the driver
getGlVersion(&gl_major, &gl_minor);
printf("GL_VERSION major=%d minor=%d\n", gl_major, gl_minor);
if (gl_major < 2)
{
printf("GL_VERSION major=%d minor=%d\n", gl_major, gl_minor);
printf("Support for OpenGL 2.0 is required for this demo...exiting\n");
exit(1);
}
glDepthFunc(GL_LESS);
glEnable(GL_DEPTH_TEST);
NextClearColor();
key('?', 0, 0); // display help
#if 0
readShaderSource("brick", &VertexShaderSource, &FragmentShaderSource);
#else
readShaderSource("cloud", &VertexShaderSource, &FragmentShaderSource);
#endif
success = installBrickShaders(VertexShaderSource, FragmentShaderSource);
CreateNoise3D();
if (success)
glutMainLoop();
return 0;
}
void initShader(char* shaderName, int id ) {
int success = 0;
int gl_major, gl_minor;
GLchar *VertexShaderSource,
*FragmentShaderSource;
glewInit();
// Make sure that OpenGL 2.0 is supported by the driver
getGlVersion(&gl_major, &gl_minor);
printf("GL_VERSION major=%d minor=%d\n", gl_major, gl_minor);
if (gl_major < 2) {
printf("GL_VERSION major=%d minor=%d\n", gl_major, gl_minor);
printf("Support for OpenGL 2.0 is required for this demo...exiting\n");
exit(1);
}
readShaderSource(shaderName, &VertexShaderSource, &FragmentShaderSource);
success = installShaders(VertexShaderSource, FragmentShaderSource, id);
if (!success) {
printf("Fail to load Shaders!!\n");
exit(0);
}
}
void kzsGLSL::initShaderProgram( const char* vertFile, const char* fragFile )
{
vertShader = glCreateShader( GL_VERTEX_SHADER );
fragShader = glCreateShader( GL_FRAGMENT_SHADER );
if ( readShaderSource( vertShader, vertFile ) ) exit( 1 );
if ( readShaderSource( fragShader, fragFile ) ) exit( 1 );
CompileShader( vertShader, "Compile error in vertex shader.\n\n" );
CompileShader( fragShader, "Compile error in fragment shader.\n\n" );
CreateProgramObject( FRAG_EXIST );
LinkProgram();
}
static void AddShader(GLuint ShaderProgram, const char* pShaderText, GLenum ShaderType)
{
// create a shader object
GLuint ShaderObj = glCreateShader(ShaderType);
if (ShaderObj == 0) {
fprintf(stderr, "Error creating shader type %d\n", ShaderType);
exit(0);
}
std::string outShader = readShaderSource(pShaderText);
const char* pShaderSource = outShader.c_str();
// Bind the source code to the shader, this happens before compilation
glShaderSource(ShaderObj, 1, (const GLchar**)&pShaderSource, NULL);
// compile the shader and check for errors
glCompileShader(ShaderObj);
GLint success;
// check for shader related errors using glGetShaderiv
glGetShaderiv(ShaderObj, GL_COMPILE_STATUS, &success);
if (!success) {
GLchar InfoLog[1024];
glGetShaderInfoLog(ShaderObj, 1024, NULL, InfoLog);
fprintf(stderr, "Error compiling shader type %d: '%s'\n", ShaderType, InfoLog);
system("PAUSE");
exit(1);
}
// Attach the compiled shader object to the program object
glAttachShader(ShaderProgram, ShaderObj);
}
int main( int argc, char **argv )
{
int success = 0;
GLcharARB *VertexShaderSource, *FragmentShaderSource;
int error = 0;
if (Args(argc, argv) == FALSE)
exit(0);
glutInit( &argc, argv );
glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
glutInitWindowSize(500, 500);
window = glutCreateWindow( "Fire and Smoke" );
glutIdleFunc( play );
glutDisplayFunc( display );
glutKeyboardFunc( key );
glutReshapeFunc( reshape );
printOpenGLError();
if ( !isExtensionSupported( "GL_ARB_shader_objects" ) ||
!isExtensionSupported( "GL_ARB_fragment_shader" ) ||
!isExtensionSupported( "GL_ARB_vertex_shader" ) ||
!isExtensionSupported( "GL_ARB_shading_language_100" ) )
{
printf("OpenGL Shading Language extensions not available\n" );
return 1;
}
if( error )
{
printf( "ERROR from wglGetProcAddress\n" );
}
createPoints( numParticles );
glDepthFunc( GL_LESS );
glEnable( GL_DEPTH_TEST );
glClearColor( 0.0f, 0.67f, 0.94f, 1.0f );
ParticleTime = 0.0f;
readShaderSource( "smoke", &VertexShaderSource, &FragmentShaderSource );
success = installParticleShaders( VertexShaderSource, FragmentShaderSource );
if ( success )
{
glutMainLoop();
}
else
{
printf( "Error installing particle shaders" );
scanf( "%d", ParticleTime );
}
return 0;
}
void MyGlWindow::loadShader( GLhandleARB& program, const char* vertexFile, const char* fragmentFile ){
// initialize glew
int glewError = glewInit();
if( glewError ) printf("Error: %s\n", glewGetErrorString(glewError));
// create shader program object and both a vertex and fragment object
program = glCreateProgramObjectARB();
GLhandleARB vertex = glCreateShaderObjectARB(GL_VERTEX_SHADER_ARB);
GLhandleARB fragment = glCreateShaderObjectARB(GL_FRAGMENT_SHADER_ARB);
// read shaders into strings
const char* vertexString = readShaderSource(vertexFile);
const char* fragmentString = readShaderSource(fragmentFile);
// give ogl the shader source string
glShaderSourceARB(vertex, 1, &vertexString, NULL);
glShaderSourceARB(fragment, 1, &fragmentString, NULL);
// compile shaders
glCompileShaderARB(vertex);
printInfoLog(vertex);
glCompileShaderARB(fragment);
printInfoLog(fragment);
// attach shaders to program object and link
glAttachObjectARB(program, vertex);
glAttachObjectARB(program, fragment);
glLinkProgramARB(program);
// display results
GLint success;
glGetObjectParameterivARB(program, GL_OBJECT_LINK_STATUS_ARB, &success);
if( !success )
{
printf("%s and %s shader could not be linked!\n", vertexFile, fragmentFile );
exit(-1); // bail out, display isn't going to happen at this point.
}
else
{
printf("%s and %s loaded and linked successfully.\n", vertexFile, fragmentFile );
}
}
// Create a GLSL program object from vertex and fragment shader files
GLuint
InitShader(const char* vShaderFile, const char* fShaderFile)
{
struct Shader {
const char* filename;
GLenum type;
GLchar* source;
} shaders[2] = {
{ vShaderFile, GL_VERTEX_SHADER, NULL },
{ fShaderFile, GL_FRAGMENT_SHADER, NULL }
};
GLuint program = glCreateProgram();
for (int i = 0; i < 2; ++i) {
Shader& s = shaders[i];
s.source = readShaderSource(s.filename);
if (shaders[i].source == NULL) {
std::cerr << "Failed to read " << s.filename << std::endl;
exit(EXIT_FAILURE);
}
GLuint shader = glCreateShader(s.type);
glShaderSource(shader, 1, (const GLchar**) &s.source, NULL);
glCompileShader(shader);
GLint compiled;
glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
if (!compiled) {
std::cerr << s.filename << " failed to compile:" << std::endl;
GLint logSize;
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &logSize);
char* logMsg = new char[logSize];
glGetShaderInfoLog(shader, logSize, NULL, logMsg);
std::cerr << logMsg << std::endl;
delete [] logMsg;
exit(EXIT_FAILURE);
}
delete [] s.source;
glAttachShader(program, shader);
}
/* link and error check */
glLinkProgram(program);
GLint linked;
glGetProgramiv(program, GL_LINK_STATUS, &linked);
if (!linked) {
std::cerr << "Shader program failed to link" << std::endl;
GLint logSize;
glGetProgramiv(program, GL_INFO_LOG_LENGTH, &logSize);
char* logMsg = new char[logSize];
glGetProgramInfoLog(program, logSize, NULL, logMsg);
std::cerr << logMsg << std::endl;
delete [] logMsg;
exit(EXIT_FAILURE);
}
/* use program object */
glUseProgram(program);
return program;
}
void kzsGLSL::initShaderProgram( const char* vertFile )
{
vertShader = glCreateShader( GL_VERTEX_SHADER );
if ( readShaderSource( vertShader, vertFile ) ) exit( 1 );
CompileShader( vertShader, "Compile error in vertex shader.\n\n" );
CreateProgramObject( FRAG_NONE );
LinkProgram();
}
bool Shader::Load(const char *filename)
{
strcpy(m_FileName, filename);
// console->printfAndRender("Compiling Shader '%s'", filename);
if( !readShaderSource() ) return false;
if( !installShaders() ) return false;
return true;
}
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;
}
// Use this method to add shaders to the program. When finished - call finalize()
void ShadedObject::addShader(GLenum shaderType, const char* fileName)
{
GLchar* source = readShaderSource(fileName);
if (source == NULL) {
std::cerr << "Failed to read " << fileName << std::endl;
exit(EXIT_FAILURE);
}
GLuint shaderObj = glCreateShader(shaderType);
if (shaderObj == 0) {
std::cerr << "Error creating shader type " << shaderType << std::endl;
exit(EXIT_FAILURE);
}
// Save the shader object - will be deleted in the destructor
m_shaderObjList.push_back(shaderObj);
glShaderSource(shaderObj, 1, (const GLchar**)&source, NULL);
glCompileShader(shaderObj);
GLint compiled;
glGetShaderiv(shaderObj, GL_COMPILE_STATUS, &compiled);
if (!compiled) {
std::cerr << fileName << " failed to compile:" << std::endl;
GLint logSize;
glGetShaderiv(shaderObj, GL_INFO_LOG_LENGTH, &logSize);
char* logMsg = new char[logSize];
glGetShaderInfoLog(shaderObj, logSize, NULL, logMsg);
std::cerr << logMsg << std::endl;
delete[] logMsg;
exit(EXIT_FAILURE);
}
delete[] source;
glAttachShader(_programID, shaderObj);
}
/*
* Main
*
******************************************************************************/
int main( int argc, char **argv )
{
int success = 0;
int gl_major, gl_minor;
GLchar *VertexShaderSource, *FragmentShaderSource;
glutInit( &argc, argv );
glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
glutInitWindowSize(500, 500);
window = glutCreateWindow( "Temperature Shader");
glutDisplayFunc(display);
glutReshapeFunc(reshape);
// Initialize the "OpenGL Extension Wrangler" library
glewInit();
// Make sure that OpenGL 2.0 is supported by the driver
getGlVersion(&gl_major, &gl_minor);
printf("GL_VERSION major=%d minor=%d\n", gl_major, gl_minor);
if (gl_major < 2)
{
printf("GL_VERSION major=%d minor=%d\n", gl_major, gl_minor);
printf("Support for OpenGL 2.0 is required for this demo...exiting\n");
exit(1);
}
readShaderSource("temp", &VertexShaderSource, &FragmentShaderSource);
success = installShaders(VertexShaderSource, FragmentShaderSource);
if (success)
glutMainLoop();
return 0;
}
unsigned int Shader::genShader(unsigned int type, const char* fileName)
{
char* log;
// create a shader object.
GLuint shader = glCreateShader(type);
// read the shader code.
char* shaderSource = readShaderSource(fileName);
if (!shaderSource)
return 0;
const char* ptrShaderSource = shaderSource;
// bind the code to the shader object.
glShaderSource(shader, 1, &ptrShaderSource, NULL);
free(shaderSource);
// compile the shader.
glCompileShader(shader);
GLint status = 0;
// query the status of the compiling.
glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
GLint length;
// read the length of the log.
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &length);
log = (GLchar*)malloc(length);
// get the log info.
glGetShaderInfoLog(shader, length, &length, log);
printf("%s\n", log);
free(log);
if (!status)
{
// delete shader.
glDeleteShader(shader);
return 0;
}
return shader;
}
std::string readFragmentSource()
{
return readShaderSource("frag");
}
std::string readVertexSource()
{
return readShaderSource("vert");
}
GLuint InitShader(const char* vShader, const char* fShader)
{
Shader shaders[2];
shaders[0].filename = vShader;
shaders[0].type = GL_VERTEX_SHADER;
shaders[1].filename = fShader;
shaders[1].type = GL_FRAGMENT_SHADER;
// create the program in the GPU
GLuint program = glCreateProgram();
for ( int i = 0; i < 2; ++i )
{
Shader& s = shaders[i];
// read file contents onto ONE LINE, doesn't seem to work
// if file passed to glShaderSource in multiple lines
bool read = readShaderSource( s.filename, s.source );
if ( !read )
{
std::cerr << "Failed to read " << s.filename << std::endl;
exit( EXIT_FAILURE );
}
// First build the shader
GLuint shader = glCreateShader( s.type );
// Second load the source
const GLchar* sourceCode = s.source.c_str();
glShaderSource( shader, 1, const_cast<const GLchar**>(&sourceCode), NULL );
// Third compile the shader
glCompileShader( shader );
// Make sure it compiled, other display error message
GLint compiled;
glGetShaderiv( shader, GL_COMPILE_STATUS, &compiled );
if ( !compiled )
{
std::cerr << s.filename << " failed to compile:" << std::endl;
GLint logSize;
glGetShaderiv( shader, GL_INFO_LOG_LENGTH, &logSize );
char* logMsg = new char[logSize];
glGetShaderInfoLog( shader, logSize, NULL, logMsg );
std::cerr << logMsg << std::endl;
delete [] logMsg;
exit( EXIT_FAILURE );
}
glAttachShader( program, shader );
}
// link and error check
glLinkProgram(program);
GLint linked;
glGetProgramiv( program, GL_LINK_STATUS, &linked );
if ( !linked )
{
std::cerr << "Shader program failed to link" << std::endl;
GLint logSize;
glGetProgramiv( program, GL_INFO_LOG_LENGTH, &logSize);
char* logMsg = new char[logSize];
glGetProgramInfoLog( program, logSize, NULL, logMsg );
std::cerr << logMsg << std::endl;
delete [] logMsg;
exit( EXIT_FAILURE );
}
// use program object
glUseProgram(program);
return program;
}
// Create a GLSL program object from vertex and fragment shader files
GLuint
InitShader(const char* vShaderFileName, const char* fShaderFileName)
{
GLuint vertex_shader, fragment_shader;
GLchar *vs_text, *fs_text;
GLuint program;
// check GLSL version
printf("GLSL version: %s\n", glGetString(GL_SHADING_LANGUAGE_VERSION));
// Create shader handlers
vertex_shader = glCreateShader(GL_VERTEX_SHADER);
fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
// Read source code from file
vs_text = readShaderSource(vShaderFileName);
fs_text = readShaderSource(fShaderFileName);
// error check
if ( vs_text == NULL ) {
printf("Failed to read from vertex shader file %s\n", vShaderFileName);
exit( 1 );
} else if (DEBUG_ON) {
printf("read shader code:\n%s\n", vs_text);
}
if ( fs_text == NULL ) {
printf("Failed to read from fragent shader file %s\n", fShaderFileName);
exit( 1 );
} else if (DEBUG_ON) {
printf("read shader code:\n%s\n", fs_text);
}
// Set shader source
const char *vv = vs_text;
const char *ff = fs_text;
glShaderSource(vertex_shader, 1, &vv, NULL);
glShaderSource(fragment_shader, 1, &ff, NULL);
// Compile shaders
glCompileShader(vertex_shader);
glCompileShader(fragment_shader);
// Check for errors in compiling shaders
GLint compiled;
glGetShaderiv( vertex_shader, GL_COMPILE_STATUS, &compiled );
if ( !compiled ) {
printf("vertex_shader failed to compile\n");
if (DEBUG_ON) {
GLint logMaxSize, logLength;
glGetShaderiv( vertex_shader, GL_INFO_LOG_LENGTH, &logMaxSize );
printf("printing error message of %d bytes\n", logMaxSize);
char* logMsg = new char[logMaxSize];
glGetShaderInfoLog( vertex_shader, logMaxSize, &logLength, logMsg );
printf("%d bytes retrieved\n", logLength);
printf("error message: %s\n", logMsg);
delete[] logMsg;
}
exit(1);
}
glGetShaderiv( fragment_shader, GL_COMPILE_STATUS, &compiled );
if ( !compiled ) {
printf("fragment_shader failed to compile\n");
if (DEBUG_ON) {
GLint logMaxSize, logLength;
glGetShaderiv( fragment_shader, GL_INFO_LOG_LENGTH, &logMaxSize );
printf("printing error message of %d bytes\n", logMaxSize);
char* logMsg = new char[logMaxSize];
glGetShaderInfoLog( fragment_shader, logMaxSize, &logLength, logMsg );
printf("%d bytes retrieved\n", logLength);
printf("error message: %s\n", logMsg);
delete[] logMsg;
}
exit(1);
}
// Create the program
program = glCreateProgram();
// Attach shaders to program
glAttachShader(program, vertex_shader);
glAttachShader(program, fragment_shader);
// Link and set program to use
glLinkProgram(program);
glUseProgram(program);
return program;
}
static void initShader(const GLchar* vShaderFile, const GLchar* fShaderFile)
{
GLint status;
GLchar *vSource, *fSource;
GLuint vShader, fShader;
/* read shader files */
vSource = readShaderSource(vShaderFile);
if(vSource==NULL)
{
printf( "Failed to read vertex shaderi\n");
exit(EXIT_FAILURE);
}
fSource = readShaderSource(fShaderFile);
if(fSource==NULL)
{
printf("Failed to read fragment shader");
exit(EXIT_FAILURE);
}
/* create program and shader objects */
vShader = glCreateShader(GL_VERTEX_SHADER);
fShader = glCreateShader(GL_FRAGMENT_SHADER);
program = glCreateProgram();
/* attach shaders to the program object */
glAttachShader(program, vShader);
glAttachShader(program, fShader);
/* read shaders */
glShaderSource(vShader, 1, (const GLchar**) &vSource, NULL);
glShaderSource(fShader, 1, (const GLchar**) &fSource, NULL);
/* compile vertex shader shader */
glCompileShader(vShader);
/* error check */
glGetShaderiv(vShader, GL_COMPILE_STATUS, &status);
if(status==GL_FALSE)
{
printf("Failed to compile the vertex shader.\n");
glGetShaderiv(vShader, GL_INFO_LOG_LENGTH, &elength);
ebuffer = malloc(elength*sizeof(char));
glGetShaderInfoLog(vShader, elength, NULL, ebuffer);
printf("%s\n", ebuffer);
exit(EXIT_FAILURE);
}
/* compile fragment shader shader */
glCompileShader(fShader);
/* error check */
glGetShaderiv(fShader, GL_COMPILE_STATUS, &status);
if(status==GL_FALSE)
{
printf("Failed to compile the fragment shader.\n");
glGetShaderiv(fShader, GL_INFO_LOG_LENGTH, &elength);
ebuffer = malloc(elength*sizeof(char));
glGetShaderInfoLog(fShader, elength, NULL, ebuffer);
printf("%s\n", ebuffer);
exit(EXIT_FAILURE);
}
/* link and error check */
glLinkProgram(program);
glGetProgramiv(program, GL_LINK_STATUS, &status);
if(status==GL_FALSE)
{
printf("Failed to link program object.\n");
glGetProgramiv(program, GL_INFO_LOG_LENGTH, &elength);
ebuffer = malloc(elength*sizeof(char));
glGetProgramInfoLog(program, elength, &elength, ebuffer);
printf("%s\n", ebuffer);
exit(EXIT_FAILURE);
}
/* use program object */
glUseProgram(program);
/* set up uniform parameter */
/* timeParam = glGetUniformLocation(program, "time"); */
}
// Create a GLSL program object from vertex and fragment shader files
GLuint Painter::init_shader(const char* vShaderFile, const char* fShaderFile, const char* outputAttributeName, const char* gShaderFile)
{
struct Shader {
const char* filename;
GLenum type;
GLchar* source;
};
std::vector<Shader> shaders = { { vShaderFile, GL_VERTEX_SHADER, NULL }, { fShaderFile, GL_FRAGMENT_SHADER, NULL } };
if(gShaderFile)
{
shaders.push_back({ gShaderFile, GL_GEOMETRY_SHADER, NULL });
}
GLuint program = glCreateProgram();
for ( int i = 0; i < shaders.size(); ++i ) {
Shader& s = shaders[i];
s.source = readShaderSource( s.filename );
if ( shaders[i].source == NULL ) {
std::cerr << "Failed to read " << s.filename << std::endl;
exit( EXIT_FAILURE );
}
GLuint shader = glCreateShader( s.type );
glShaderSource( shader, 1, (const GLchar**) &s.source, NULL );
glCompileShader( shader );
GLint compiled;
glGetShaderiv( shader, GL_COMPILE_STATUS, &compiled );
if ( !compiled ) {
std::cerr << s.filename << " failed to compile:" << std::endl;
GLint logSize;
glGetShaderiv( shader, GL_INFO_LOG_LENGTH, &logSize );
char* logMsg = new char[logSize];
glGetShaderInfoLog( shader, logSize, NULL, logMsg );
std::cerr << logMsg << std::endl;
delete [] logMsg;
exit( EXIT_FAILURE );
}
delete [] s.source;
glAttachShader( program, shader );
}
/* Link output */
glBindFragDataLocation(program, 0, outputAttributeName);
/* link and error check */
glLinkProgram(program);
GLint linked;
glGetProgramiv( program, GL_LINK_STATUS, &linked );
if ( !linked ) {
std::cerr << "Shader program failed to link" << std::endl;
GLint logSize;
glGetProgramiv( program, GL_INFO_LOG_LENGTH, &logSize);
char* logMsg = new char[logSize];
glGetProgramInfoLog( program, logSize, NULL, logMsg );
std::cerr << logMsg << std::endl;
delete [] logMsg;
exit( EXIT_FAILURE );
}
/* use program object */
glUseProgram(program);
return program;
}
// Create a GLSL program object from vertex and fragment shader files
GLuint initShader(const char* vShaderFile, const char* fShaderFile)
{
// Function-local class for holding shader information
struct Shader {
const char* filename;
GLenum type;
GLchar* source;
} shaders[2] = {
{ vShaderFile, GL_VERTEX_SHADER, NULL },
{ fShaderFile, GL_FRAGMENT_SHADER, NULL }
};
// create a program object and get a UID to it
GLuint program = glCreateProgram();
// Read and then compile each shader
for ( int i = 0; i < 2; ++i ) {
// Read in and check for parse errors
Shader& s = shaders[i];
s.source = readShaderSource( s.filename );
if ( shaders[i].source == NULL ) {
std::cerr << "Failed to read " << s.filename << std::endl;
;
exit( EXIT_FAILURE );
}
// create a shader object and get a UID to it
GLuint shader = glCreateShader( s.type );
// Attach the program string to the shader object (on the card)
glShaderSource( shader, 1, (const GLchar**) &s.source, NULL );
// Attempt to compile the shader and check for errors
glCompileShader( shader );
GLint compiled;
glGetShaderiv( shader, GL_COMPILE_STATUS, &compiled );
if ( !compiled ) {
std::cerr << s.filename << " failed to compile:" << std::endl;
GLint logSize;
glGetShaderiv( shader, GL_INFO_LOG_LENGTH, &logSize );
char* logMsg = new char[logSize];
glGetShaderInfoLog( shader, logSize, NULL, logMsg );
std::cerr << logMsg << std::endl;
delete [] logMsg;
;
exit( EXIT_FAILURE );
}
// Clean up memory allocated in readShaderSource()
delete [] s.source;
// Plug the shader into the program object
glAttachShader( program, shader );
}
// link program and check for errors
glLinkProgram(program);
GLint linked;
glGetProgramiv( program, GL_LINK_STATUS, &linked );
if ( !linked ) {
std::cerr << "Shader program failed to link" << std::endl;
GLint logSize;
glGetProgramiv( program, GL_INFO_LOG_LENGTH, &logSize);
char* logMsg = new char[logSize];
glGetProgramInfoLog( program, logSize, NULL, logMsg );
std::cerr << logMsg << std::endl;
delete [] logMsg;
;
exit( EXIT_FAILURE );
}
// activate the program object
glUseProgram(program);
return program;
}
///////////////////////////////////////////////////////
//
// This routine creates the shader program, including the vertex shader and fragment shader objects
//
GLuint SetupGLSL(char *fileName){
GLuint programObject;
GLuint vertexShaderObject;
GLuint fragmentShaderObject;
check_graphics(); // check the capability of the graphics card in use
programObject = glCreateProgram(); // create an overall shader program
if (programObject == 0) { // error checking
printf(" Error creating shader program object.\n");
exit(1);
}
else printf(" Succeeded creating shader program object.\n");
vertexShaderObject = glCreateShader(GL_VERTEX_SHADER);
if (vertexShaderObject == 0) { // error checking
printf(" Error creating vertex shader object.\n");
exit(1);
}
else printf(" Succeeded creating vertex shader object.\n");
fragmentShaderObject = glCreateShader(GL_FRAGMENT_SHADER);
if (fragmentShaderObject == 0) { // error checking
printf(" Error creating fragment shader object.\n");
exit(1);
}
else printf(" Succeeded creating fragment shader object.\n");
// now input the vertex and fragment programs as ascii
readShaderSource(fileName, &vertexShaderSource, &fragmentShaderSource);
glShaderSource(vertexShaderObject,1,(const GLchar**)&vertexShaderSource,NULL);
glShaderSource(fragmentShaderObject,1,(const GLchar**)&fragmentShaderSource,NULL);
// now compile the shader code; vertex shader first, followed by fragment shader
glCompileShader(vertexShaderObject);
// error checking and printing out log if error
GLint result;
glGetShaderiv(vertexShaderObject, GL_COMPILE_STATUS, &result);
if (result == GL_FALSE) {
printf(" vertex shader compilation failed!\n");
GLint logLen;
glGetShaderiv(vertexShaderObject, GL_INFO_LOG_LENGTH, &logLen);
if (logLen > 0) {
char *log = (char*) malloc(logLen);
GLsizei written;
glGetShaderInfoLog(vertexShaderObject, logLen, &written, log);
printf("Sahder log: \n %s", log);
free(log);
}
}
glCompileShader(fragmentShaderObject);
glGetShaderiv(fragmentShaderObject, GL_COMPILE_STATUS, &result);
if (result == GL_FALSE) {
printf(" fragment shader compilation failed!\n");
GLint logLen;
glGetShaderiv(fragmentShaderObject, GL_INFO_LOG_LENGTH, &logLen);
if (logLen > 0) {
char *log = (char*) malloc(logLen);
GLsizei written;
glGetShaderInfoLog(fragmentShaderObject, logLen, &written, log);
printf("Sahder log: \n %s", log);
free(log);
}
}
// insert compiler error checking code later
glAttachShader(programObject, vertexShaderObject);
glAttachShader(programObject, fragmentShaderObject);
glLinkProgram(programObject);
// insert linking error checking code later
return(programObject);
}
void begin()
{
// old-BATB didn't like to be initialized more than once :(
// hence, ignore re-init for specified parts, and continue with previous state
static bool empty = true;
// clear exit, making possible to start over again
//do_exit = false;
// copied from old::main:
//MainWindow::winPosX = 100;
//MainWindow::winPosY = 100;
//MainWindow::winWidth = 640;
//MainWindow::winHeight = 480;
// init glut
//glutInitWindowPosition(MainWindow::winPosX, MainWindow::winPosY);
//glutInitWindowSize (MainWindow::winWidth, MainWindow::winHeight);
//glutInit (&argc, argv);
//glutInitDisplayMode (GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
//MainWindow::main_window = glutCreateWindow("Beat About the Bush");
MainWindow::enableDisplayFunc();
// implemented as GLFW:
GLFWwindow* win = glfwGetCurrentContext();
glfwSetKeyCallback( win, MainWindow::glfwKey ); //glutKeyboardFunc (MainWindow::keyDownFn);
//glutSpecialFunc (MainWindow::specialDownFn);
////glutKeyboardUpFunc (MainWindow::keyUpFn);
////glutSpecialUpFunc (MainWindow::specialUpFn);
glfwSetCursorPosCallback( win, MainWindow::glfwCursorPos ); //glutMouseFunc (MainWindow::mousefn);
glfwSetMouseButtonCallback( win, MainWindow::glfwMouseButton); //glutMotionFunc (MainWindow::motionfn);
glfwSetWindowSizeCallback( win, MainWindow::glfwWindowSize ); //glutReshapeFunc (MainWindow::reshapefn);
glfwSetWindowFocusCallback( win, MainWindow::glfwWindowFocus ); //glutVisibilityFunc (MainWindow::visibility);
if ( empty )
{
// init plib, with no GLUT-binding!
puInitOLD();
puSetDefaultStyle ( PUSTYLE_SMALL_SHADED );
puSetDefaultColourScheme ( 0.3f, 0.4f, 0.6f, 1.0f);
// Initialize the "OpenGL Extension Wrangler" library
//glewInit();
}
mainWindow.initLights();
if ( empty )
{
mainWindow.init();
printVersions();
// Make sure that OpenGL 2.0 is supported by the driver
int gl_major, gl_minor;
getGlVersion(&gl_major, &gl_minor);
printf("GL_VERSION major=%d minor=%d\n", gl_major, gl_minor);
if (gl_major < 2)
{
printf("GL_VERSION major=%d minor=%d\n", gl_major, gl_minor);
printf("Support for OpenGL 2.0 is required for this demo...exiting\n");
//exit(1);
old::exit(1);
return;
}
// init shaders
GLchar *dayVSSource, *dayFSSource;
readShaderSource( old::file("shader/day").c_str(), &dayVSSource, &dayFSSource);
dayShader = installShaders(dayVSSource, dayFSSource);
float forestGreen[] = {34.0/255, 139.0/255, 34.0/255};
//float auburn[] = {113.0/255, 47.0/255, 38.0/255};
float grey[] = {0.5, 0.5, 0.5};
//float sepia[] = {112.0/255, 66.0/255, 20.0/255};
setUniform3f(dayShader, "GrassColor", forestGreen[0], forestGreen[1], forestGreen[2]);
setUniform3f(dayShader, "RockColor", grey[0], grey[1], grey[2]);
//setUniform3f(dayShader, "DirtColor", sepia[0], sepia[1], sepia[2]);
//setUniform4f(dayShader, "LightPos", 0.0, 0.0, 100.0, 1.0);
setUniform1f(dayShader, "Scale", 1.0);
setUniform1f(dayShader, "TerrainHigh", 0.1);
setUniform1f(dayShader, "TerrainLow", 0.1);
setUniform1i(dayShader, "Trees", 0); // sampler
setUniform1i(dayShader, "AltGrad", 1); // sampler
setUniform1i(dayShader, "Noise", 2); // sampler
GLchar *nightVSSource, *nightFSSource;
readShaderSource( old::file("shader/night3").c_str(), &nightVSSource, &nightFSSource);
nightShader = installShaders(nightVSSource, nightFSSource);
setUniform3f(nightShader, "BrickColor", 1.0, 0.3, 0.2);
setUniform3f(nightShader, "MortarColor", 0.85, 0.86, 0.84);
setUniform2f(nightShader, "BrickSize", 0.30, 0.15);
setUniform2f(nightShader, "BrickPct", 0.90, 0.85);
setUniform1i(nightShader, "numEnabledLights", 2);
setUniform3f(nightShader, "GrassColor", forestGreen[0], forestGreen[1], forestGreen[2]);
setUniform3f(nightShader, "RockColor", grey[0], grey[1], grey[2]);
setUniform1f(nightShader, "Scale", 1.0);
setUniform1f(nightShader, "TerrainHigh", 0.1);
setUniform1f(nightShader, "TerrainLow", 0.1);
setUniform1i(nightShader, "Trees", 0); // sampler
setUniform1i(nightShader, "AltGrad", 1); // sampler
setUniform1i(nightShader, "Noise", 2); // sampler
GLchar *nightTreeVS, *nightTreeFS;
readShaderSource( old::file("shader/nightTree").c_str(), &nightTreeVS, &nightTreeFS);
nightTrees = installShaders(nightTreeVS, nightTreeFS);
setUniform1i(nightTrees, "Trees", 0); // sampler
// BUGFIX:
free( dayVSSource );
free( dayFSSource );
free( nightVSSource );
free( nightFSSource );
free( nightTreeVS );
free( nightTreeFS );
}
// enter main loop
//if (dayShader && nightShader)
// glutMainLoop();
//return 0;
empty = false;
}
// Create a NULL-terminated string by reading the provided file
static char*
readShaderSource(const char* shaderFile)
{
//FILE* fp = fopen(shaderFile, "r"); // VS gives warning about being insecure :-)
// one way to deal with warning: http://stackoverflow.com/questions/2575116/fopen-fopen-s-and-writing-to-files:
FILE* fp;
#ifdef WIN32
errno_t err;
if( (err = fopen_s( &fp, shaderFile, "rb" )) !=0 ) {
#else
if ((fp_config = fopen(shaderFile, "r")) == NULL) {
#endif
fprintf(stderr, "Cannot open config file %s!\n", shaderFile);
}
if ( fp == NULL ) { return NULL; }
fseek(fp, 0L, SEEK_END);
long size = ftell(fp);
fseek(fp, 0L, SEEK_SET);
char* buf = new char[size + 1];
fread(buf, 1, size, fp);
buf[size] = '\0';
fclose(fp);
return buf;
}
// Create a GLSL program object from vertex and fragment shader files
GLuint
CompileShader(const char* vShaderFile, const char* fShaderFile)
{
struct Shader {
const char* filename;
GLenum type;
GLchar* source;
} shaders[2] = {
{ vShaderFile, GL_VERTEX_SHADER, NULL },
{ fShaderFile, GL_FRAGMENT_SHADER, NULL }
};
GLuint program = glCreateProgram();
for ( int i = 0; i < 2; ++i ) {
Shader& s = shaders[i];
s.source = readShaderSource( s.filename );
if ( shaders[i].source == NULL ) {
std::cerr << "Failed to read " << s.filename << std::endl;
exit( EXIT_FAILURE );
}
GLuint shader = glCreateShader( s.type );
glShaderSource( shader, 1, (const GLchar**) &s.source, NULL );
glCompileShader( shader );
GLint compiled;
glGetShaderiv( shader, GL_COMPILE_STATUS, &compiled );
if ( !compiled ) {
std::cerr << s.filename << " failed to compile:" << std::endl;
GLint logSize;
glGetShaderiv( shader, GL_INFO_LOG_LENGTH, &logSize );
char* logMsg = new char[logSize];
glGetShaderInfoLog( shader, logSize, NULL, logMsg );
std::cerr << logMsg << std::endl;
delete [] logMsg;
exit( EXIT_FAILURE );
}
delete [] s.source;
glAttachShader( program, shader );
}
/* link and error check */
glLinkProgram(program);
GLint linked;
glGetProgramiv( program, GL_LINK_STATUS, &linked );
if ( !linked ) {
std::cerr << "Shader program failed to link" << std::endl;
GLint logSize;
glGetProgramiv( program, GL_INFO_LOG_LENGTH, &logSize);
char* logMsg = new char[logSize];
glGetProgramInfoLog( program, logSize, NULL, logMsg );
std::cerr << logMsg << std::endl;
delete [] logMsg;
exit( EXIT_FAILURE );
}
/* use program object */
glUseProgram(program);
return program;
}
int initResources( void )
{
const char* vsSource;
const char* fsSource;
char* attribute_coord3d_name;
char* attribute_corRGB_name;
const char* uniform_matriz_global_name;
GLint compileOK = GL_FALSE;
GLint linkOK = GL_FALSE;
/* String contendo o codigo (GLSL) do vertex-shader */
vsSource = readShaderSource( "vShader.glsl" );
if( vsSource == NULL )
{
fprintf(
stderr,
"ERRO no LEITURA do VERTEX-SHADER\n"
);
exit( EXIT_FAILURE );
}
/* Para passar vertices 3D ao Vertex-Shader */
attribute_coord3d_name = "coord3d";
/* Para passar cores ao Vertex-Shader */
attribute_corRGB_name = "v_corRGB";
/* Para passar a matriz global ao Vertex-Shader */
uniform_matriz_global_name = "matriz";
/* String contendo o codigo (GLSL) do fragment-shader */
fsSource = readShaderSource( "fShader.glsl" );
if( fsSource == NULL )
{
fprintf(
stderr,
"ERRO no LEITURA do FRAGMENT-SHADER\n"
);
exit( EXIT_FAILURE );
}
/* Criar e compilar o Vertex-Shader */
vs = glCreateShader( GL_VERTEX_SHADER );
glShaderSource( vs, 1, &vsSource, NULL );
glCompileShader( vs );
glGetShaderiv( vs, GL_COMPILE_STATUS, &compileOK );
if( compileOK == 0 )
{
fprintf( stderr, "Error in vertex shader\n" );
return 0;
}
/* Criar e compilar o Fragment-Shader */
fs = glCreateShader( GL_FRAGMENT_SHADER );
glShaderSource( fs, 1, &fsSource, NULL );
glCompileShader( fs );
glGetShaderiv( fs, GL_COMPILE_STATUS, &compileOK );
if( compileOK == 0 )
{
fprintf( stderr, "Error in fragment shader\n" );
return 0;
}
/* Criando o programa em GLSL */
programaGLSL = glCreateProgram();
glAttachShader( programaGLSL, vs );
glAttachShader( programaGLSL, fs );
glLinkProgram( programaGLSL );
glGetProgramiv( programaGLSL, GL_LINK_STATUS, &linkOK );
if( linkOK == 0 )
{
fprintf( stderr, "Error while linking\n" );
return 0;
}
/* Para input ao Vertex-Shader */
attribute_coord3d = glGetAttribLocation( programaGLSL, attribute_coord3d_name );
if( attribute_coord3d == -1 )
{
fprintf( stderr, "Could not bind attribute %s\n", attribute_coord3d_name );
return 0;
}
attribute_corRGB = glGetAttribLocation( programaGLSL, attribute_corRGB_name );
if( attribute_corRGB == -1 )
{
fprintf( stderr, "Could not bind attribute %s\n", attribute_corRGB_name );
return 0;
}
uniform_location_matriz_global = glGetUniformLocation( programaGLSL, "matriz");
if( uniform_location_matriz_global == -1 )
{
fprintf( stderr, "Could not bind uniform %s\n", uniform_matriz_global_name );
return 0;
}
return 1;
}
