OmniShadowMap.cpp

#include "OmniShadowMap.h"

OmniShadowMap::OmniShadowMap() : ShadowMap() {}

bool OmniShadowMap::Init(unsigned int width, unsigned int height)
{
	shadowWidth = width; shadowHeight = height;

	glGenFramebuffers(1, &FBO);

	glGenTextures(1, &shadowMap);
	glBindTexture(GL_TEXTURE_CUBE_MAP, shadowMap);

	for (size_t i = 0; i < 6; ++i)
	{
		glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_DEPTH_COMPONENT, shadowWidth, shadowHeight, 0, GL_DEPTH_COMPONENT, GL_FLOAT, nullptr);
	}

	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);

	glBindFramebuffer(GL_FRAMEBUFFER, FBO);
	glFramebufferTexture(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, shadowMap, 0);
	glDrawBuffer(GL_NONE);
	glReadBuffer(GL_NONE);

	GLenum Status = glCheckFramebufferStatus(GL_FRAMEBUFFER);

	if (Status != GL_FRAMEBUFFER_COMPLETE)
	{
		printf("Framebuffer error: %i\n", Status);
		return false;
	}

	glBindFramebuffer(GL_FRAMEBUFFER, 0);

	return true;
}

void OmniShadowMap::Write()
{
	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, FBO);
}

void OmniShadowMap::Read(GLenum texUnit)
{
	glActiveTexture(texUnit);
	glBindTexture(GL_TEXTURE_CUBE_MAP, shadowMap);
}

OmniShadowMap::~OmniShadowMap()
{
}