stencil buffer的使用代码,C代码库,德仔网

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【C】 stencil buffer的使用

作者:润惠 / 发布于2015/9/14/ 873


	void Init()
	{
	 glClearColor(0.0, 0.0, 0.0, 0.0);
	 glClearDepth(1.0);
	 glEnable(GL_DEPTH_TEST);
	 glClearStencil(0);
	 glEnable(GL_STENCIL_TEST);

	 glEnable(GL_TEXTURE_2D);
	 glGenTextures(1, &texture);
	 glBindTexture(GL_TEXTURE_2D, texture);
	 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, winW, winH, 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);
	 glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
	 glBindTexture(GL_TEXTURE_2D, 0);

	 glGenFramebuffers(1, &FBO);
	 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, FBO);
	 glGenRenderbuffers(1, &RBO);
	 glBindRenderbuffer(GL_RENDERBUFFER, RBO);
	 glBindTexture(GL_TEXTURE_2D, texture);
	 glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, winW, winH);
	 glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);
	 glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, RBO);
	 glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, RBO);
	 glClearColor(0.0, 0.0, 0.0, 0.0);
	 glClearDepth(1.0);
	 glEnable(GL_DEPTH_TEST);
	 glClearStencil(0);
	 glEnable(GL_STENCIL_TEST);
	 reshape(winW, winH);
	 glBindTexture(GL_TEXTURE_2D, 0);
	 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);

	 glGenBuffers(2, VBO);
	 glBindBuffer(GL_ARRAY_BUFFER, VBO[0]);
	 glBufferData(GL_ARRAY_BUFFER, sizeof(vpoint), vpoint, GL_STATIC_DRAW);
	 glBindBuffer(GL_ARRAY_BUFFER, VBO[1]);
	 glBufferData(GL_ARRAY_BUFFER, sizeof(tpoint), tpoint, GL_STATIC_DRAW);
	}

	void display()
	{
	 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, FBO);
	 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
	 glPushMatrix();
	 glStencilFunc(GL_NEVER, 0x0, 0x0);
	 glStencilOp(GL_INCR, GL_INCR, GL_INCR);
	 glColor3f(1.0, 0.0, 0.0);
	 glRectf(-0.5, -0.5, 0.5, 0.5);

	 glStencilFunc(GL_EQUAL, 0x0, 0x1);
	 glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
	 glColor3f(0.0, 1.0, 1.0);
	 glRectf(0, 0, 1, 1);
	 glPopMatrix();

	 glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
	 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
	 glPushMatrix();
	 glStencilFunc(GL_ALWAYS, 0x0, 0x0);
	 glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
	 glEnableClientState(GL_VERTEX_ARRAY);
	 glEnableClientState(GL_TEXTURE_COORD_ARRAY);
	 glBindTexture(GL_TEXTURE_2D, texture);
	 glBindBuffer(GL_ARRAY_BUFFER, VBO[0]);
	 glVertexPointer(3, GL_FLOAT, 0, 0);
	 glBindBuffer(GL_ARRAY_BUFFER, VBO[1]);
	 glTexCoordPointer(2, GL_FLOAT, 0, 0);
	 glDrawArrays(GL_QUADS, 0, 4);
	 glBindBuffer(GL_ARRAY_BUFFER, 0);
	 glBindTexture(GL_TEXTURE_2D, 0);
	 glDisableClientState(GL_VERTEX_ARRAY);
	 glDisableClientState(GL_TEXTURE_COORD_ARRAY);
	 glPopMatrix();
	 glutSwapBuffers();
	}

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　stencil　　buffe　

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