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#include "Shader.h"
#include <string>
GLuint loadIndividualShader(GLenum shaderType, const GLchar* cCode) {
GLuint shader = glCreateShader(shaderType);
glShaderSource(shader, 1, &cCode, 0);
glCompileShader(shader);
GLint success;
glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
if (!success) {
GLchar infoLog[512];
glGetShaderInfoLog(shader, 512, 0, infoLog);
printf("Failed to load shader: %s, Shader =%s\n", infoLog, cCode);
return 0;
}
return shader;
}
void attachShaders(Shader& retVal, const GLchar* vertexShader, const GLchar* fragmentShader) {
GLuint vertex = 0, fragment = 0, geometry = 0;
if (vertexShader) {
vertex = loadIndividualShader(GL_VERTEX_SHADER, vertexShader);
glAttachShader(retVal, vertex);
}
if (fragmentShader) {
fragment = loadIndividualShader(GL_FRAGMENT_SHADER, fragmentShader);
glAttachShader(retVal, fragment);
}
glLinkProgram(retVal);
GLint isLinked = 0;
glGetProgramiv(retVal, GL_LINK_STATUS, (int*)&isLinked);
if (isLinked == GL_FALSE) {
GLint maxLength = 0;
glGetProgramiv(retVal, GL_INFO_LOG_LENGTH, &maxLength);
// The maxLength includes the NULL character
GLchar* infoLog = new GLchar[maxLength];
glGetProgramInfoLog(retVal, maxLength, &maxLength, infoLog);
glDeleteProgram(retVal);
printf("Error. Could not initialize shader with vertex=%s, error=%s\n", vertexShader, infoLog);
delete []infoLog;
}
if (vertexShader)
glDeleteShader(vertex);
if (fragmentShader)
glDeleteShader(fragment);
}
Shader loadShader(const GLchar* vertexShader, const GLchar* fragmentShader) {
Shader retVal;
retVal = glCreateProgram();
attachShaders(retVal, vertexShader, fragmentShader);
useShader(retVal);
return retVal;
}
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