Color problem when blending two pipeline

OpenGL
1

I am going to write a perfraglighting shader with wireframe covering on mesh surface.
I blend programable pipeline and original pipeline of OpenGL in my code, showed as follow:

glNewList(CallList[2],GL_COMPILE);
	glUseProgram(MyShader::Prog);//launch Shader
	glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);	
	glEnable(GL_POLYGON_OFFSET_FILL);
	glPolygonOffset(1.0,1.0);		
	glCallList(CallList[0]);//Using point array list
	glDisable(GL_POLYGON_OFFSET_FILL);	
	glDisable(GL_LIGHTING);
	glUseProgram(0);//shut down the shader
	glColor3f(0.0,0.0,0.0);//Setup the line color
	glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);	
	glCallList(CallList[1]);//Draw Wireframe with 
                                    //OpenGL inside pipeline in glvertex3f mode
	glEnable(GL_LIGHTING);
	glUseProgram(MyShader::Prog);
glEndList();

And in my frag shader, I use following code to produce the final color:
gl_FragColor = gl_FrontLightModelProduct + Iamb + Idiff + Ispec;

Everything is ok when I just use programable pipeline without adding original pipeline to my scene, but when I switch the rendering state to wireframe on solide surface, the color of whole object turn to be the color set by glColor(x,x,x) which is the real reason to this problem I think. Originally, I just set color blue to each vertex in vertex array, and wanna use black to line out the wireframe of the mesh.

I wanna ask are there any drawbacks in my code, and how to manage the correct color state in rendering pipeline.

thanks~

2

Finally, I get it.
Ah, I have tried a lot of methods, and finally find that I missed some important function in my code.
The correct one should be

 	glNewList(CallList[2],GL_COMPILE);;
		glPolygonMode(GL_FRONT_AND_BACK,GL_FILL);				
		glEnable(GL_POLYGON_OFFSET_FILL);
		glPolygonOffset(1.0,1.0);	
		glCallList(CallList[0]);
		glDisable(GL_POLYGON_OFFSET_FILL);	
		glDisable(GL_LIGHTING);
		glPushMatrix();//!!!
		glPushAttrib(GL_CURRENT_BIT);//!!!
		glUseProgram(0);
		glColor3f(0.0,0.0,0.0);
		glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);	
		glCallList(CallList[1]);
		glPopAttrib();//!!!
		glPopMatrix();//!!!
		glEnable(GL_LIGHTING);
		glUseProgram(MyShader::Prog);
	glEndList();

Good job~

3

This topic was automatically closed 183 days after the last reply. New replies are no longer allowed.