#include "ShadingHelper.h"
#include <glm/gtc/type_ptr.hpp>

ShadingHelper::ShadingHelper(GLuint program) {
	this->program = program;
}

void ShadingHelper::useProgram() {
	glUseProgram(program);
}

GLuint ShadingHelper::getProgram() {
	return program;
}

void ShadingHelper::bindTexture2D(GLuint texUnitIndex, GLuint texture, std::string uniform) {
		glActiveTexture(GL_TEXTURE0 + texUnitIndex);
		glBindTexture(GL_TEXTURE_2D, texture);
		glUniform1i(glGetUniformLocation(program, &uniform[0]), texUnitIndex);
}

void ShadingHelper::bindViewUniforms(glm::mat4 projection, glm::mat4 view) {
	GLint projectionUniform = glGetUniformLocation(program, "Projection");
	glUniformMatrix4fv(projectionUniform, 1, GL_FALSE, value_ptr(projection));
	GLint viewUniform = glGetUniformLocation(program, "View");
	glUniformMatrix4fv(viewUniform, 1, GL_FALSE, value_ptr(view));
}

void ShadingHelper::bindLightUniforms(glm::vec3 lightPos, glm::vec3 lightCol, glm::vec3 eyePos) {
	glUniform3f(glGetUniformLocation(program, "lightPos"), lightPos.x, lightPos.y, lightPos.z);
	glUniform3f(glGetUniformLocation(program, "lightCol"), lightCol.x, lightCol.y, lightCol.z);
	glUniform3f(glGetUniformLocation(program, "eyePos"), eyePos.x, eyePos.y, eyePos.z);
}

void ShadingHelper::bindModelUniforms(glm::mat4 locRotScl, glm::mat4 rotScl) {
	GLint localTransformUniform = glGetUniformLocation(program, "Model");
	glUniformMatrix4fv(localTransformUniform, 1, GL_FALSE, value_ptr(locRotScl));
	GLint onlyRotationUniform = glGetUniformLocation(program, "ModelRot");
	glUniformMatrix4fv(onlyRotationUniform, 1, GL_FALSE, value_ptr(rotScl));
}