OceanRendering/WaterFramebuffer.cpp at master · SarahBoening/OceanRendering · GitHub

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#include "WaterFramebuffer.h"

WaterFramebuffer::WaterFramebuffer(int width, int height)
{
	screenWidth = width;
	screenHeight = height;
	initialiseReflectionFrameBuffer();
	initialiseRefractionFrameBuffer();
}

void WaterFramebuffer::setScreenViewport(int width, int height)
{
	screenWidth = width;
	screenHeight = height;
}

void WaterFramebuffer::initialiseReflectionFrameBuffer()
{
	reflectionFrameBuffer = createFrameBuffer();
	reflectionTexture = createTextureAttachment(REFLECTION_WIDTH, REFLECTION_HEIGHT);
	reflectionDepthBuffer = createDepthBufferAttachment(REFLECTION_WIDTH, REFLECTION_HEIGHT);
	GLenum DrawBuffers[1] = { GL_COLOR_ATTACHMENT0 };
	glDrawBuffers(1, DrawBuffers);
	if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
		printf("Error while initialising Reflection Framebuffer");
	unbindCurrentFramebuffer();
}

void WaterFramebuffer::initialiseRefractionFrameBuffer()
{
	refractionFrameBuffer = createFrameBuffer();
	refractionTexture = createTextureAttachment(REFRACTION_WIDTH, REFRACTION_HEIGHT);
	refractionDepthTexture = createDepthTextureAttachment(REFRACTION_WIDTH, REFRACTION_HEIGHT);
	GLenum DrawBuffers[1] = { GL_COLOR_ATTACHMENT0 };
	glDrawBuffers(1, DrawBuffers);
	if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
		printf("Error while initialising Reflection Framebuffer");
	unbindCurrentFramebuffer();
}

GLuint WaterFramebuffer::createFrameBuffer()
{
	GLuint framebuffer = 0;
	glGenFramebuffers(1, &framebuffer);
	glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
	return framebuffer;
}

GLuint WaterFramebuffer::createDepthBufferAttachment(int width, int height)
{
	GLuint depthrenderbuffer;
	glGenRenderbuffers(1, &depthrenderbuffer);
	glBindRenderbuffer(GL_RENDERBUFFER, depthrenderbuffer);
	glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, width, height);
	glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depthrenderbuffer);
	return depthrenderbuffer;
}

GLuint WaterFramebuffer::createTextureAttachment(int width, int height)
{
	GLuint renderedTexture;
	glGenTextures(1, &renderedTexture);
	glBindTexture(GL_TEXTURE_2D, renderedTexture);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, renderedTexture, 0);
	return renderedTexture;
}

GLuint WaterFramebuffer::createDepthTextureAttachment(int width, int height)
{
	GLuint depthTexture;
	glGenTextures(1, &depthTexture);
	glBindTexture(GL_TEXTURE_2D, depthTexture);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT24, width, height, 0, GL_DEPTH_COMPONENT, GL_FLOAT, 0);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glFramebufferTexture(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, depthTexture, 0);
	return depthTexture;
}

void WaterFramebuffer::bindFramebuffer(GLuint frameBuffer, int width, int height)
{
	glBindTexture(GL_TEXTURE_2D, 0);
	glBindFramebuffer(GL_FRAMEBUFFER, frameBuffer);
	glViewport(0, 0, width, height);
}

void WaterFramebuffer::bindReflectionFrameBuffer()
{
	bindFramebuffer(reflectionFrameBuffer, REFLECTION_WIDTH, REFLECTION_HEIGHT);
}

void WaterFramebuffer::bindRefractionFrameBuffer()
{
	bindFramebuffer(refractionFrameBuffer, REFRACTION_WIDTH, REFRACTION_HEIGHT);
}

void WaterFramebuffer::unbindCurrentFramebuffer()
{
	glBindFramebuffer(GL_FRAMEBUFFER, 0);
	glDrawBuffer(GL_BACK);
	glViewport(0, 0, screenWidth, screenHeight);
}