我尝试创建具有两种颜色的墙：顶部 0.8、0.8、1 和底部 0.4、0.4、0.8，其余部分我想插入这两种颜色。
我有这些片段着色器和顶点着色器：
顶点着色器
#version 330
uniform mat4 modelMatrix,viewMatrix, projMatrix;
layout (location = 0) in vec4 position;
layout (location = 1) in vec3 color;
out vec3 Color;
void main()
{
Color = color;
gl_Position = projMatrix * viewMatrix * modelMatrix * position ;
}
片段着色器
#version 330
in vec3 Color;
void main()
{
gl_FragColor = vec4(Color,1.0);
}
我在 c++ 中的代码的某些部分：
unsigned int ProgramShader,VertexShader,FragmentShader;
Mode current_mode = GPU;
float verticesBackground[] = { -200.0f, -100.0f, -100.0f,
200.0f, -100.0f, -100.0f,
200.0f, 100.0f, -100.0f,
-200.0f, 100.0f, -100.0f
};
int indexesBackground[] = { 0 , 1 , 2 ,
2 , 3 , 0
};
float colorsBackground[] = { 0.8f, 0.8f, 1.0f,
0.8f, 0.8f, 1.0f,
0.4f, 0.4f, 0.8f,
0.4f, 0.4f, 0.8f
};
// vao-uri
unsigned int BackgroundVao;
// vbo-uri
unsigned int BackgroundVboPositions, BackgroundVboColors;
// ibo-uri
unsigned int BackgroundIbo;
unsigned int ProjectionMatrixLocation, ViewMatrixLocation, ModelMatrixLocation;
mat4 ModelMatrix;
mat4 ProjectionMatrix;
mat4 ViewMatrix;
void RenderBackground()
{ //glLoadIdentity();
glUseProgram(ProgramShader);
//backgroundShader.Use();
/*glUniformMatrix4fv(ProjectionMatrixLocation, 1, false, ProjectionMatrix.m);
glUniformMatrix4fv(ViewMatrixLocation, 1, false, ViewMatrix.m);
mat4 identity;
identity.setIdentity();
glUniformMatrix4fv(ModelMatrixLocation, 1, false, identity.m);
glUniformMatrix4fv(ModelMatrixLocation, 1, false, ModelMatrix.m);
glBindVertexArray(BackgroundVao); //revine la starea de desenare a cubului
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, (void*)0); //deseneaza backgroundul, 4 indecsi
*/
glBegin(GL_POLYGON);
glColor3f(0.8f,0.8f,1.0f);
glVertex3f(-200.0f,-100.0f,-100.0f);
glVertex3f(200.0f,-100.0f,-100.0f);
glColor3f(0.4f,0.4f,0.8f);
glVertex3f(200.0f,100.0f,-100.0f);
glVertex3f(-200.0f,100.0f,-100.0f);
glEnd();
glUseProgram(0);
}
glBegin 仅用于测试并且它有效，但是当我尝试使用 glDrawElements 时，我得到黑屏。
void display(void) {
switch(current_mode) {
case CPU:
RenderCPU();
break;
case GPU:
RenderBackground();
break;
case CUDA:
RenderCUDA();
break;
}
glutSwapBuffers();
glutPostRedisplay();
}
我的主要是：
int main ( int argc, char** argv )
{
glutInitContextFlags(GLUT_FORWARD_COMPATIBLE | GLUT_DEBUG);
glutInit( &argc, argv );
glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA | GLUT_MULTISAMPLE);
glutInitWindowSize(1280, 720 );
glutCreateWindow( "Etapa 2 - Cloth" );
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutKeyboardFunc(keyboard);
glewExperimental =true;
glewInit();
glGetError();
glEnable(GL_MULTISAMPLE);
glEnable(GL_DEPTH_TEST);
InitShaders(std::string("shaders\\background.vs"),std::string("shaders\\background.fs"));
glBuffersInit();
ModelMatrix.setIdentity();
glutMainLoop();
}
我的着色器加载器：
void InitShaders(std::string VertexShaderFilename, std::string FragmentShaderFilename){
int InfoLogLength=0,Result=0;
//constructie vertex shader
std::cout<<std::endl<<"Constructie vertex shader din "<<VertexShaderFilename<<std::endl;
VertexShader = glCreateShader(GL_VERTEX_SHADER); //creez un obiect de tip vertex shader
std::string VertexShaderCode = LoadText(VertexShaderFilename); //citesc fiserul si il tin in string
const char *VertexShaderCodePtr = VertexShaderCode.c_str();
const int VertexShaderCodeSize = VertexShaderCode.size();
glShaderSource(VertexShader,1,&VertexShaderCodePtr,&VertexShaderCodeSize); //atasez codul sursa din string in obiectul de tip vertex shader
glCompileShader(VertexShader); //compilez obiectul
glGetShaderiv(VertexShader, GL_COMPILE_STATUS, &Result); //obtin rezultatul compilarii
if(Result == GL_FALSE){
glGetShaderiv(VertexShader, GL_INFO_LOG_LENGTH, &InfoLogLength); //obtin lungimea logului
std::vector<char> VertexShaderLog(InfoLogLength);
glGetShaderInfoLog(VertexShader, InfoLogLength, NULL, &VertexShaderLog[0]); //copiez logul
std::cout<<"EROARE :\n "<<&VertexShaderLog[0]<<std::endl; //output log
}else std::cout<<"Constructie vertex shader terminata cu sucess"<<std::endl<<std::endl;
CHECK_GL_ERRORS
//constructie fragment shader
std::cout<<"Constructie fragment shader din "<<FragmentShaderFilename<<std::endl;
FragmentShader = glCreateShader(GL_FRAGMENT_SHADER); //creez un obiect de tip fragment shader
std::string FragmentShaderCode = LoadText(FragmentShaderFilename); //citesc fiserul si il tin in string
const char *FragmentShaderCodePtr = FragmentShaderCode.c_str();
const int FragmentShaderCodeSize = FragmentShaderCode.size();
glShaderSource(FragmentShader,1,&FragmentShaderCodePtr,&FragmentShaderCodeSize);//atasez codul sursa din string in obiectul de tip fragment shader
glCompileShader(FragmentShader); //compilez obiectul
glGetShaderiv(FragmentShader, GL_COMPILE_STATUS, &Result); //obtin rezultatul compilarii
if(Result == GL_FALSE){
glGetShaderiv(FragmentShader, GL_INFO_LOG_LENGTH, &InfoLogLength); //obtin lungimea logului
std::vector<char> FragmentShaderLog(InfoLogLength);
glGetShaderInfoLog(FragmentShader, InfoLogLength, NULL, &FragmentShaderLog[0]); //copiez logul
std::cout<<"EROARE :\n "<<&FragmentShaderLog[0]<<std::endl; //output log
}else std::cout<<"Constructie fragment shader terminata cu success "<<std::endl<<std::endl;
CHECK_GL_ERRORS
//constructie program combinat
std::cout<<"Constructie program combinat "<<std::endl;
ProgramShader = glCreateProgram(); //creez un obiect gol de tip program
glAttachShader(ProgramShader,VertexShader); //atasez obiectul de tip vertex shader
glAttachShader(ProgramShader,FragmentShader); //atasez obiectul de tip fragment shader
glLinkProgram(ProgramShader); //link-ez programul
glGetProgramiv(ProgramShader, GL_LINK_STATUS, &Result); //obtin rezultatul linkarii
if(Result == GL_FALSE){
glGetProgramiv(ProgramShader, GL_INFO_LOG_LENGTH, &InfoLogLength);
std::vector<char> ProgramShaderLog(InfoLogLength);
glGetProgramInfoLog(ProgramShader, InfoLogLength, NULL, &ProgramShaderLog[0]);
std::cout<<"EROARE :\n "<<&ProgramShaderLog[0]<<std::endl;
}else std::cout<<"Constructie program terminata cu success "<<std::endl;
glDeleteShader(VertexShader); //nu mai sunt necesare daca vom lucra doar cu programul
glDeleteShader(FragmentShader);
CHECK_GL_ERRORS
//obtine locatiile uniform-urilor din programul compilat & linkat
ProjectionMatrixLocation = glGetUniformLocation(ProgramShader, "projMatrix");
ViewMatrixLocation = glGetUniformLocation(ProgramShader, "viewMatrix");
ModelMatrixLocation = glGetUniformLocation(ProgramShader, "modelMatrix");
CHECK_GL_ERRORS
}