Question

我正在尝试使用GLFW和GLEW（可选地是GLM）在OGL中细分一组顶点。我遇到的问题是，我似乎找不到用于将顶点颜色和位置数组传递给GLSL着色器脚本的教程，这样我就可以在屏幕上显示镶嵌。

我可以很好地处理数组缓冲区和索引缓冲区，但是我不知道如何快速将自相交顶点数组细分为正3D或2D结构。谁能提供一些示例代码？谢谢。

    void display(void)
    {
        //glfwMakeContextCurrent(wavebricks_window);    glLoadIdentity();
        //glTranslatef(1.5f, 0.0f, -7.0f);
        for (int it =0; it<instruments.size();it++){

            alGetSourcef(instruments[it].soundsource, AL_SEC_OFFSET, &tracking);
            instruments[it].currentStep=tracking*(60/tempo);
            instruments[it].currentStep=tracking;
            instruments[it].tempo=tempo;
            instruments[it].render();

            float verts[instruments[it].voices_spinner*3];
            float colors[instruments[it].voices_spinner*4];
            std::string vertexShader;
            std::string fragmentShader;
            unsigned int indices[instruments[it].voices_spinner*3];
            for (int i=0;i<instruments[it].voices_spinner;i++){
                indices[i]=i;
            }
            for (int i=instruments[it].voices_spinner-1;i>=0;i--){
                indices[instruments[it].voices_spinner+i]=instruments[it].voices_spinner-1-i;
            }
            for (int i=instruments[it].voices_spinner-1;i>=0;i--){
                indices[instruments[it].voices_spinner*2+i]=i;
            }
            for(int i=0; i<instruments[it].voices_spinner; i++){
                verts[3*i]=instruments[it].instrumentPoly[i][0];
                cout<<"\n"<<verts[3*i]<<",";
                verts[3*i+1]=instruments[it].instrumentPoly[i][1];
                cout<<verts[3*i+1]<<",";
                verts[3*i+2]=instruments[it].instrumentPoly[i][2];
                cout<<verts[3*i+2]<<":";
                colors[4*i]=-instruments[it].instrumentPoly[i][3];
                cout<<colors[4*i]<<",";
                colors[4*i+1]=-instruments[it].instrumentPoly[i][4];
                cout<<colors[4*i+1]<<",";
                colors[4*i+2]=-instruments[it].instrumentPoly[i][5];
                cout<<colors[4*i+2]<<";\n";
                colors[4*i+3]=1.0f;

            }
            GLint MaxPatchVertices = 0;
            glGetIntegerv(GL_MAX_PATCH_VERTICES, &MaxPatchVertices);
            printf("Max supported patch vertices %d\n", MaxPatchVertices);
            glPatchParameteri(GL_PATCH_VERTICES, instruments[it].voices_spinner);
            Renderer renderer;
            renderer.Clear();
            VertexArray va;
            VertexBuffer vb(verts, instruments[it].voices_spinner*3*4);

            Shader shader("shade.shader");

            VertexBufferLayout layout;
            layout.Push<float>(3);
            va.AddBuffer(vb, layout);
            IndexBuffer ib(indices,instruments[it].voices_spinner * 3*4);
            shader.Bind();
            va.Bind();
            ib.Bind();

            shader.SetUniform4f("u_Color",0.8f,0.3f,0.8f,1.0f);

            renderer.Draw(va, ib, shader);
            float r = 0.0f;
            float increment=0.05f;
            /*va.Unbind();
            vb.Unbind();
            ib.Unbind();
            shader.Unbind();*/
        }
    }

我的抽奖电话是：

glDrawElements(GL_PATCHES, ib.getCount(),GL_UNSIGNED_INT, nullptr);

我希望看到合适的形状，但是什么都没有出现。

在OpenGL中如何对一组顶点和颜色进行细分？

0 个答案: