Tools/RenderModuleProgress/framebufferobject.cpp · 萌谷王/GameEngine

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game_engine

Tools

RenderModuleProgress

framebufferobject.cpp

framebufferobject.cpp 2.53 KB

#include "framebufferobject.h"
FrameBufferObject::FrameBufferObject(){
	glGenFramebuffers(1, &mFrameBufferObject);
}
void FrameBufferObject::AttachColorBuffer(const char*bufferName,
	GLenum attachment, int width, int height, GLenum format){
	GLuint colorBuffer;
	glBindFramebuffer(GL_FRAMEBUFFER, mFrameBufferObject);
	glGenTextures(1, &colorBuffer);
	glBindTexture(GL_TEXTURE_2D, colorBuffer);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
	glBindTexture(GL_TEXTURE_2D, 0);
	glFramebufferTexture2D(GL_FRAMEBUFFER, attachment, GL_TEXTURE_2D, colorBuffer, 0);
	mDrawBuffers.push_back(attachment);
	mBuffers.insert(std::pair<std::string,GLuint>(bufferName,colorBuffer));
	glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
void FrameBufferObject::AttachDepthBuffer(const char*bufferName, int width, int height){
	GLuint depthMap;
	glBindFramebuffer(GL_FRAMEBUFFER, mFrameBufferObject);
	glGenTextures(1, &depthMap);
	glBindTexture(GL_TEXTURE_2D, depthMap);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, width, height, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
	glBindTexture(GL_TEXTURE_2D, 0);
	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depthMap, 0);
	mBuffers.insert(std::pair<std::string, GLuint>(bufferName, depthMap));
	glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
void FrameBufferObject::Finish(){
	int nCount = (int)mDrawBuffers.size();
	if (nCount>0){
		GLenum *buffers = new GLenum[nCount];
		int i = 0;
		while (i<nCount){
			buffers[i] = mDrawBuffers[i];
 i++;
		}
		glBindFramebuffer(GL_FRAMEBUFFER, mFrameBufferObject);
		glDrawBuffers(nCount, buffers);
		glBindFramebuffer(GL_FRAMEBUFFER, 0);
	}
}
void FrameBufferObject::Bind(){
	glGetIntegerv(GL_FRAMEBUFFER_BINDING, &mPrevFrameBuffer);
	glBindFramebuffer(GL_FRAMEBUFFER, mFrameBufferObject);
	glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}
void FrameBufferObject::Unbind(){
	glBindFramebuffer(GL_FRAMEBUFFER, mPrevFrameBuffer);
}
GLuint FrameBufferObject::GetBuffer(const char*bufferName){
	auto iter = mBuffers.find(bufferName);
	if (iter!=mBuffers.end()){
		return iter->second;
	}
	return 0;
}

Copy Edit Raw Blame History

豌豆佛 authored 2024年08月14日 13:10 +08:00 . 初始化教学版游戏引擎的Runtime

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#include "framebufferobject.h"
FrameBufferObject::FrameBufferObject(){
	glGenFramebuffers(1, &mFrameBufferObject);
}
void FrameBufferObject::AttachColorBuffer(const char*bufferName,
	GLenum attachment, int width, int height, GLenum format){
	GLuint colorBuffer;
	glBindFramebuffer(GL_FRAMEBUFFER, mFrameBufferObject);
	glGenTextures(1, &colorBuffer);
	glBindTexture(GL_TEXTURE_2D, colorBuffer);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
	glBindTexture(GL_TEXTURE_2D, 0);
	glFramebufferTexture2D(GL_FRAMEBUFFER, attachment, GL_TEXTURE_2D, colorBuffer, 0);
	mDrawBuffers.push_back(attachment);
	mBuffers.insert(std::pair<std::string,GLuint>(bufferName,colorBuffer));
	glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
void FrameBufferObject::AttachDepthBuffer(const char*bufferName, int width, int height){
	GLuint depthMap;
	glBindFramebuffer(GL_FRAMEBUFFER, mFrameBufferObject);
	glGenTextures(1, &depthMap);
	glBindTexture(GL_TEXTURE_2D, depthMap);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, width, height, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
	glBindTexture(GL_TEXTURE_2D, 0);
	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depthMap, 0);
	mBuffers.insert(std::pair<std::string, GLuint>(bufferName, depthMap));
	glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
void FrameBufferObject::Finish(){
	int nCount = (int)mDrawBuffers.size();
	if (nCount>0){
		GLenum *buffers = new GLenum[nCount];
		int i = 0;
		while (i<nCount){
			buffers[i] = mDrawBuffers[i];
 i++;
		}
		glBindFramebuffer(GL_FRAMEBUFFER, mFrameBufferObject);
		glDrawBuffers(nCount, buffers);
		glBindFramebuffer(GL_FRAMEBUFFER, 0);
	}
}
void FrameBufferObject::Bind(){
	glGetIntegerv(GL_FRAMEBUFFER_BINDING, &mPrevFrameBuffer);
	glBindFramebuffer(GL_FRAMEBUFFER, mFrameBufferObject);
	glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}
void FrameBufferObject::Unbind(){
	glBindFramebuffer(GL_FRAMEBUFFER, mPrevFrameBuffer);
}
GLuint FrameBufferObject::GetBuffer(const char*bufferName){
	auto iter = mBuffers.find(bufferName);
	if (iter!=mBuffers.end()){
		return iter->second;
	}
	return 0;
}