BaseShader::BaseShader(const char* vShader, const char* fShader) {
GLint logLength, status;
GLchar* sourceString = NULL;
GetGLError();
// Create a program object
mProgram = glCreateProgram();
GetGLError();
if (vShader){
// Allocate memory for the source string including the version preprocessor information
sourceString = getShaderString(vShader, "vsh");
GLuint vertexShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertexShader, 1, (const GLchar **)&(sourceString), NULL);
glCompileShader(vertexShader);
glGetShaderiv(vertexShader, GL_INFO_LOG_LENGTH, &logLength);
if (logLength > 0)
{
GLchar *log = (GLchar*) malloc(logLength);
glGetShaderInfoLog(vertexShader, logLength, &logLength, log);
printf("Vtx shader compiled log: %s\n", log);
free(log);
}
glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &status);
if (status == 0)
{
printf("Failed to compile vtx shader:\n%s\n", sourceString);
}
free(sourceString);
sourceString = NULL;
// Attach the vertex shader to our program
glAttachShader(mProgram, vertexShader);
// Delete the vertex shader since it is now attached
// to the program, which will retain a reference to it
glDeleteShader(vertexShader);
}
if (fShader){
// Allocate memory for the source string including the version preprocessor information
sourceString = getShaderString(fShader, "fsh");
GLuint fragShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragShader, 1, (const GLchar **)&(sourceString), NULL);
glCompileShader(fragShader);
glGetShaderiv(fragShader, GL_INFO_LOG_LENGTH, &logLength);
if (logLength > 0)
{
GLchar *log = (GLchar*)malloc(logLength);
glGetShaderInfoLog(fragShader, logLength, &logLength, log);
printf("Frag Shader compile log:\n%s\n", log);
free(log);
}
glGetShaderiv(fragShader, GL_COMPILE_STATUS, &status);
if (status == 0)
{
printf("Failed to compile frag shader:\n%s\n", sourceString);
}
free(sourceString);
sourceString = NULL;
// Attach the fragment shader to our program
glAttachShader(mProgram, fragShader);
// Delete the fragment shader since it is now attached
// to the program, which will retain a reference to it
glDeleteShader(fragShader);
}
// linkProgram();
}
GLuint LoadShaders(char * vertex_file_path, char * fragment_file_path){
// Create the shaders
GLuint VertexShaderID = glCreateShader(GL_VERTEX_SHADER);
GLuint FragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
char *vertex_shader_string;
char *fragment_shader_string;
// Read the Vertex Shader code from the file
vertex_shader_string = getShaderString(vertex_file_path, 0);
//printf("vertex_shader_string%s\n", vertex_shader_string);
// Read the Fragment Shader code from the file
fragment_shader_string = getShaderString(fragment_file_path, 1);
//printf("fragment_shader_string %d \n%s", strlen(fragment_shader_string), fragment_shader_string);
// Compile Vertex Shader
printf("\nCompiling shader : %s\n", vertex_file_path);
glShaderSource(VertexShaderID, 1, &vertex_shader_string , NULL);
glCompileShader(VertexShaderID);
{
GLint success;
glGetShaderiv(VertexShaderID, GL_COMPILE_STATUS, &success);
if(success == GL_FALSE) {
char log[1024];
glGetShaderInfoLog(VertexShaderID, sizeof(log), 0, log);
printf("vert shader compile info: \n %s \n", log);
glDeleteShader(VertexShaderID);
//glDeleteProgram(shader);
//shader = 0;
return 1;
}
}
// Compile Fragment Shader
printf("Compiling shader : %s\n", fragment_file_path);
char const * FragmentSourcePointer = fragment_shader_string;
glShaderSource(FragmentShaderID, 1, &fragment_shader_string , NULL);
glCompileShader(FragmentShaderID);
{
GLint success;
glGetShaderiv(FragmentShaderID, GL_COMPILE_STATUS, &success);
if(success == GL_FALSE) {
char log[1024];
glGetShaderInfoLog(FragmentShaderID, sizeof(log), 0, log);
printf("fragment shader compile info: \n %s \n", log);
glDeleteShader(FragmentShaderID);
//glDeleteProgram(shader);
//shader = 0;
return 1;
}
}
// Link the program
fprintf(stdout, "Linking program\n");
GLuint ProgramID = glCreateProgram();
glAttachShader(ProgramID, VertexShaderID);
glAttachShader(ProgramID, FragmentShaderID);
glLinkProgram(ProgramID);
glDeleteShader(VertexShaderID);
glDeleteShader(FragmentShaderID);
return ProgramID;
}
