OpenGLShader 编程系列 - 查询shader中的Uniforms

GLint maxUniformLen;

GLint numUniforms;

GLint index;

glGetProgramiv(this->_program, GL_ACTIVE_UNIFORMS, &numUniforms);

glGetProgramiv(this->_program, GL_ACTIVE_UNIFORM_MAX_LENGTH, &maxUniformLen);

GLchar* uniformName = (GLchar*)malloc(sizeof(GLchar)*maxUniformLen);

for(index = 0; index < numUniforms; index++)

{

GLint size;

GLenum type;

GLint location;

GLint length;

glGetActiveUniform(this->_program, index, maxUniformLen, &length, &size, &type, uniformName);

location = glGetUniformLocation(this->_program, uniformName);

switch(type)

{

case GL_FLOAT:

//

break;

case GL_FLOAT_VEC2:

//

break;

case GL_FLOAT_VEC3:

//

break;

case GL_FLOAT_VEC4:

//

break;

case GL_INT:

//

break;

//.....all type

default:

//

break;

}

}

free(uniformName);