DepthMap.cpp

#include "DepthMap.h"

unsigned int DepthMap::dm;
glm::mat4 DepthMap::lightSpaceMatrix;

DepthMap::DepthMap() {}

DepthMap::DepthMap(float np, float fp) {
	glm::mat4 projection = glm::ortho(-25.0f, 25.0f, -25.0f, 25.0f, np, fp);

	glm::mat4 view = glm::lookAt(glm::vec3(-2.0f, 2.0f, -1.0f),
		glm::vec3(0.0f, 0.0f, 0.0f),
		glm::vec3(0.0f, 1.0f, 0.0f));

	lightSpaceMatrix = projection * view;
	std::cout << glm::to_string(lightSpaceMatrix) << std::endl;
	// Initialize frame buffer
	glGenFramebuffers(1, &FBO);
	glGenTextures(1, &dm);
	glBindTexture(GL_TEXTURE_2D, dm);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT,
		SHADOW_WIDTH, SHADOW_HEIGHT, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
	float borderColor[] = { 1.0f, 1.0f, 1.0f, 1.0f };
	glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_REF_TO_TEXTURE);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_FUNC, GL_LEQUAL);

	glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, borderColor);

	glEnable(GL_DEPTH_TEST);
	glBindFramebuffer(GL_FRAMEBUFFER, FBO);
	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, dm, 0);
	glDrawBuffer(GL_NONE);
	glReadBuffer(GL_NONE);
	glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
void DepthMap::draw() {
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glViewport(0, 0, SHADOW_WIDTH, SHADOW_HEIGHT);
	glBindFramebuffer(GL_FRAMEBUFFER, FBO);
	glClearDepth(1.0f);
	glClear(GL_DEPTH_BUFFER_BIT);
}

/*
void DepthMap::draw(GameManager * gm, GLuint shader) {
	glViewport(0, 0, SHADOW_WIDTH, SHADOW_HEIGHT);
	glBindFramebuffer(GL_FRAMEBUFFER, FBO);
	glClear(GL_DEPTH_BUFFER_BIT);
}

void DepthMap::draw(GameManager* gm, Model * m, GLuint shader) {
	glViewport(0, 0, SHADOW_WIDTH, SHADOW_HEIGHT);
	glBindFramebuffer(GL_FRAMEBUFFER, FBO);
	glClear(GL_DEPTH_BUFFER_BIT);
}
*/