glbase/OmniShadowMap.cpp at master · aarotoiv/glbase · GitHub

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#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++) {
        // GL_TEXTURE_CUBE_MAP_POSITIVE_.. X, Y, Z are right after each other so this works
        glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_DEPTH_COMPONENT, shadowWidth, shadowHeight, 0, GL_DEPTH_COMPONENT, GL_FLOAT, nullptr);
    }

    glTexParameterf(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameterf(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_BORDER);

    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: %s\n", Status);
		return false;
	}

    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() {

}