创建fbo

main.cpp

@@ -133,6 +133,10 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 	/*创建纹理*/
 	GLuint mainTexture = CreateTextureFromFile("res/image/niutou.bmp");
 
+	/*创建FBO*/
+	GLuint colorBuffer, depthBuffer;
+	GLuint fbo = CreateFramebufferObject(colorBuffer, depthBuffer, windowWidth, windowHeight);
+
 	GL_CALL(glClearColor(0.1f, 0.4f, 0.7f, 1.0f));
 	glEnable(GL_DEPTH_TEST);
 

misc.cpp

@@ -26,6 +26,44 @@ GLuint CreateVAOWithVBOSettings(std::function<void()> settings)
 	return vao;
 }
 
+GLuint CreateFramebufferObject(GLuint & colorBuffer, GLuint & depthBuffer, int width, int height)
+{
+	GLuint fbo;
+	glGenFramebuffers(1, &fbo);
+	glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+
+	//colorbuffer
+	glGenTextures(1, &colorBuffer);
+	glBindTexture(GL_TEXTURE_2D, colorBuffer);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
+	glBindTexture(GL_TEXTURE_2D, 0);
+	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, colorBuffer, 0);//°ó¶¨¸Õ²ÅÉú³ÉµÄtextureµ½GL_COLOR_ATTACHMENT0
+
+	//depthbuffer
+	glGenTextures(1, &depthBuffer);
+	glBindTexture(GL_TEXTURE_2D, depthBuffer);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, width, height, 0, GL_RGBA, GL_DEPTH_COMPONENT, nullptr);
+	glBindTexture(GL_TEXTURE_2D, 0);
+	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depthBuffer, 0);
+
+	//check
+	GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
+	if (status != GL_FRAMEBUFFER_COMPLETE) {
+		printf("create framebuffer object fail\n");
+	}
+
+	glBindFramebuffer(GL_FRAMEBUFFER, 0);
+	return GLuint();
+}
+
 char* LoadFileContent(const char *path) {
 	FILE* pFile = fopen(path, "rb");
 	if (pFile) {

misc.h

@@ -4,6 +4,7 @@
 
 GLuint CreateBufferObject(GLenum bufferType, GLsizeiptr size, GLenum usage, void* data = nullptr);
 GLuint CreateVAOWithVBOSettings(std::function<void()>settings);
+GLuint CreateFramebufferObject(GLuint &colorBuffer, GLuint &depthBuffer, int width, int height);
 
 char* LoadFileContent(const char *path);
 GLuint CompileShader(GLenum shaderType, const char* shaderPath);