C++ Shader::DrawArrays方法代码示例

void DeferredRenderer::DrawAmbientLight(const glm::vec3 &color) {
  //화면 전체를 단색으로 그리기
  Device *device = Device::GetInstance();
  RenderState &render_state = device->render_state();
  Shader &shader = ambient_shader();
  render_state.UseShader(shader);

  mat4 mvp(1.0f);
  shader.SetUniformMatrix(kMVPHandleName, mvp);

  vec4 ambient_color(color, 1.0f);
  shader.SetUniformVector(kAmbientColorHandleName, ambient_color);

  Texture diffuse_tex = DiffuseTex();
  render_state.UseTexture(diffuse_tex, 0);
  
  vector<Vertex2D> vert_list;
  vert_list.push_back(CreateVertex2D(-1, -1, 0, 0));
  vert_list.push_back(CreateVertex2D(1, -1, 1, 0));
  vert_list.push_back(CreateVertex2D(1, 1, 1, 1));
  vert_list.push_back(CreateVertex2D(-1, 1, 0, 1));
  shader.DrawArrays(kDrawTriangleFan, vert_list);
}

void DeferredRenderer::SetCommonLightQuadDraw(Shader &shader) {
  Device *dev = Device::GetInstance();
  RenderState &render_state = dev->render_state();

  const mat4 &projection_mat = render_state.GetProjection3D();
  const mat4 &view_mat = render_state.view_mat();
  const mat4 &model_mat = render_state.model_mat();
  mat4 modelview = view_mat * model_mat;
  //벡터방향만 잇으면 되니까 이동관련속성은 날리기
  for(int i = 0 ; i < 3 ; ++i) {
    modelview[3][i] = 0;
  }
  vec4 viewport(0, 0, render_state.win_width(), render_state.win_height());

  float pixels[4][2] = {
    { 0, 0 },
    { viewport[2], 0 },
    { viewport[2], viewport[3] },
    { 0, viewport[3] },
  };
  vec3 view_vec_list[4];
  for(int i = 0 ; i < 4 ; i++) {
    vec3 win_coord(pixels[i][0], pixels[i][1], 10);
    vec3 obj = glm::unProject(win_coord, modelview, projection_mat, viewport);
    vec3 &view_vec = view_vec_list[i];
    view_vec = obj;
    vec3 cam_pos = MatrixHelper::ViewPos(view_mat);
    view_vec -= cam_pos;
    view_vec = glm::normalize(view_vec);

    mat3 modelview_mat3(modelview);
    view_vec = modelview_mat3 * view_vec;
    view_vec.z *= -1; //픽셀에서 cam_pos로 들어오는 방향으로 만들기 위해서 z뒤집음
  }

  //fragment마다 view vector를 계산하기 위해서 계산에 필요한 정보까지 넣기
  //4군데만 넣어주면 나머지는 알아서 적절히 보간될것이다
  struct LightQuadVertex {
    LightQuadVertex(float x, float y, float s, float t, const vec3 &view_vec)
      : pos(x, y), texcoord(s, t), view_vec(view_vec) {}
    vec2 pos;
    vec2 texcoord;
    vec3 view_vec;
  };
  vector<LightQuadVertex> vert_list;
  vert_list.push_back(LightQuadVertex(-1, -1, 0, 0, view_vec_list[0]));
  vert_list.push_back(LightQuadVertex(1, -1, 1, 0, view_vec_list[1]));
  vert_list.push_back(LightQuadVertex(1, 1, 1, 1, view_vec_list[2]));
  vert_list.push_back(LightQuadVertex(-1, 1, 0, 1, view_vec_list[3]));

  ShaderVariable pos_var = shader.attrib_var(kPositionHandleName);
  ShaderVariable texcoord_var = shader.attrib_var(kTexcoordHandleName);
  ShaderVariable view_vec_var = shader.attrib_var("a_viewVector");
  
  {
    SR_ASSERT(pos_var.location != kInvalidShaderVarLocation);
    AttribBindParam param;
    param.dim = 2;
    param.normalize = false;
    param.offset = offsetof(LightQuadVertex, pos);
    param.var_type = GL_FLOAT;
    param.vert_size = sizeof(LightQuadVertex);
    void *ptr = &vert_list[0];
    SetAttrib(pos_var, param, (char*)ptr);
  }
  {
    SR_ASSERT(texcoord_var.location != kInvalidShaderVarLocation);
    AttribBindParam param;
    param.dim = 2;
    param.normalize = false;
    param.offset = offsetof(LightQuadVertex, texcoord);
    param.var_type = GL_FLOAT;
    param.vert_size = sizeof(LightQuadVertex);
    void *ptr = &vert_list[0];
    SetAttrib(texcoord_var, param, (char*)ptr);
  }
  if(view_vec_var.location != kInvalidShaderVarLocation) {
    AttribBindParam param;
    param.dim = 3;
    param.normalize = true;
    param.offset = offsetof(LightQuadVertex, view_vec);
    param.var_type = GL_FLOAT;
    param.vert_size = sizeof(LightQuadVertex);
    void *ptr = &vert_list[0];
    SetAttrib(view_vec_var, param, (char*)ptr);
  }

  shader.DrawArrays(kDrawTriangleFan, vert_list.size());

  /*
  vector<Vertex2D> vert_list;
  vert_list.push_back(CreateVertex2D(-1, -1, 0, 0));
  vert_list.push_back(CreateVertex2D(1, -1, 1, 0));
  vert_list.push_back(CreateVertex2D(1, 1, 1, 1));
  vert_list.push_back(CreateVertex2D(-1, 1, 0, 1));
  shader.DrawArrays(kDrawTriangleFan, vert_list);
  */
}

  void draw_frame(Device *device) {
    SR_CHECK_ERROR("Begin RenderFrame");
    RenderState &render_state = device->render_state();
    vec4ub color(77, 77, 77, 255);
    render_state.ClearBuffer(true, true, false, color);

    //3d
    device->render_state().Set3D();

    depth_fbo.Bind();  //fbo로 그리기. deferred같은거 구현하기 위해서 임시로 시도함
    device->render_state().Set3D();
    render_state.ClearBuffer(true, true, false, color);

    VertexList vert_list;
    vert_list.push_back(CreateVertex(vec3(-0.5, -0.5, 0), vec2(0, 0)));
    vert_list.push_back(CreateVertex(vec3(0.5, -0.5, 0), vec2(1, 0)));
    vert_list.push_back(CreateVertex(vec3(0, 0.5, 0), vec2(0.5, 1)));

    //vbo, ibo 적절히 만들기
    if(vbo.Loaded() == false) {
      vbo.Init(vert_list);
    }
    if(wire_ibo.Loaded() == false) {
      IndexList index_list;
      index_list.push_back(0);
      index_list.push_back(1);
      index_list.push_back(1);
      index_list.push_back(2);
      index_list.push_back(2);
      index_list.push_back(0);
      wire_ibo.Init(index_list);
    }

    {
      //shader사용 선언이 가장 먼저
      device->render_state().UseShader(color_shader);
      SR_CHECK_ERROR("UseShader");

      mat4 mvp(1.0f);
      ShaderVariable mvp_var = color_shader.uniform_var(kMVPHandleName);
      SetUniformMatrix(mvp_var, mvp);

      vec4 color(1.0f);
      ShaderVariable const_color_var = color_shader.uniform_var(kConstColorHandleName);
      SetUniformVector(const_color_var, color);
      SR_CHECK_ERROR("SetVector");

      color_shader.SetVertexList(vert_list);
      color_shader.DrawArrays(kDrawTriangles, vert_list.size());

      color_shader.DrawArrays(kDrawTriangles, vbo);

      color_shader.DrawElements(kDrawLines, vbo, wire_ibo);
    }

    {
      //shader사용 선언이 가장 먼저
      device->render_state().UseShader(simple_shader);
      TexturePtr tex = device->tex_mgr()->Get("sora");
      device->render_state().UseTexture(*tex, 0);
      SR_CHECK_ERROR("UseShader");
      mat4 mvp(1.0f);
      mvp = glm::rotate(mvp, 10.0f, vec3(0, 0, 1));
      ShaderVariable mvp_var = simple_shader.uniform_var(kMVPHandleName);
      SetUniformMatrix(mvp_var, mvp);
      SR_CHECK_ERROR("SetMatrix");
      simple_shader.SetVertexList(vert_list);
      simple_shader.DrawArrays(kDrawTriangles, vert_list.size());
    }

    //일반 3d객체 그리기+카메라 회전 장착
    {
      //set camera + projection
      float win_width = (float)device->render_state().win_width();
      float win_height = (float)device->render_state().win_height();
      glm::mat4 projection = glm::perspective(45.0f, win_width / win_height, 0.1f, 100.0f);
      float radius = 4;
      float cam_x = radius * cos(SR_DEG_2_RAD(aptitude)) * sin(SR_DEG_2_RAD(latitude));
      float cam_y = radius * sin(SR_DEG_2_RAD(aptitude));
      float cam_z = radius * cos(SR_DEG_2_RAD(aptitude)) * cos(SR_DEG_2_RAD(latitude));
      vec3 eye(cam_x, cam_y, cam_z);
      vec3 center(0);
      vec3 up(0, 1, 0);
      glm::mat4 view = glm::lookAt(eye, center, up);

      glm::mat4 mvp(1.0f);
      mvp = projection * view;
      ShaderVariable mvp_var = simple_shader.uniform_var(kMVPHandleName);
      SetUniformMatrix(mvp_var, mvp);
      SR_CHECK_ERROR("SetMatrix");

      GeometricObject<Vertex> mesh;
      //mesh.PointTeapot(0.05f);
      //mesh.WireTeapot(0.05f);
      //mesh.SolidTeapot(0.05f);
      //mesh.WireShpere(1, 16, 16);
      //mesh.PointShpere(1, 16, 16);
      //mesh.SolidSphere(1, 16, 16);
      //mesh.SolidCube(1, 1, 1);
      //mesh.WireCube(1, 1, 1);
//.........这里部分代码省略.........