Cocos2d Opengl2.1 升级到 opengl3.3

CCGLViewImpl-desktop.cpp

	//在glfwCreateWindow前插入下面4行
    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    ...
    glfwCreateWindow();
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CCClippingNode.cpp

	//glGetIntegerv(GL_STENCIL_BITS, &g_sStencilBits);
	//改为
	glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_STENCIL, GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE, &g_sStencilBits);

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CCConfiguration.cpp

	//glGetString(GL_EXTENSIONS);
	//改为
	glGetStringi(GL_EXTENSIONS,i);
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CCGL-mac.h

//#import 
//改为
#import <OpenGL/gl3.h>
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CCClippingNode.cpp
添加vao支持，opengl3的draw必须绑定vao,否则会报GL_INVALID_OPERATION错误

        Vec2 vertices[] = {
            Vec2(-1, -1),
            Vec2(1, -1),
            Vec2(1, 1),
            Vec2(-1, 1)
        };

        glGenVertexArrays(1, &_vao);
        GL::bindVAO(_vao);
        glGenBuffers(1, &_vbo);
        glBindBuffer(GL_ARRAY_BUFFER, _vbo);
        glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STREAM_DRAW);

        glEnableVertexAttribArray(GLProgram::VERTEX_ATTRIB_POSITION);
        glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, 0);

        GL::bindVAO(0);
        glBindBuffer(GL_ARRAY_BUFFER, 0);

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同理，UILayout.cpp,CCLayer.cpp 也需要添加vao支持
另外，shader需要支持glsl 330
CCGLProgram.cpp

    const GLchar *sources[] = {
        "#version 330\n",
        (type == GL_FRAGMENT_SHADER ? "out vec4 FragColor;\n" : "\n"),

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顶点着色器中 attribute 改为 in; varying 改为 out

in vec4 a_position;
in vec4 a_color;
in vec2 a_texCoord;

out vec4 v_fragmentColor;
out vec3 v_texCoord;

void main()
{
    gl_Position = CC_PMatrix * vec4(a_position.xy,0,a_position.w);
    v_fragmentColor = a_color;
    v_texCoord = vec3(a_texCoord,a_position.z);
}
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片元着色器中varying改为in;
texture2D改为texture;
gl_FragColor改为自定义的FragColor

in vec4 v_fragmentColor;
in vec2 v_texCoord;

void main()
{
    FragColor = v_fragmentColor * texture(CC_Texture0, v_texCoord);
}
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