OpenGL C++, Cubemap, vertexshader

我目前正在学习OpengGL，但我似乎无法在我的顶点着色器中解决这个"void"错误。到目前为止，我的片段着色器或主.cpp文件没有问题。非常感谢任何意见。

Include standard headers
#include <stdio.h> 
#include <stdlib.h>
#include GLEW
#include <GL/glew.h>
#include <vector>
#include <iostream>
// Include GLFW
#include <GLFW/glfw3.h>
GLFWwindow* window;
// Include GLM
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
using namespace glm;
#include <common/skyboxtex.hpp>
#include <common/shader.hpp>
#include <common/texture.hpp>
#include <common/controls.hpp>
#include <glm/gtc/type_ptr.hpp>

int main( void )
{
// Initialise GLFW
if( !glfwInit() )
{
fprintf( stderr, "Failed to initialize GLFWn" );
getchar();
return -1;
}
glfwWindowHint(GLFW_SAMPLES, 4);
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); // To make MacOS happy; should not be needed
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
// Open a window and create its OpenGL context
window = glfwCreateWindow( 1024, 768, "Tutorial 0 - Keyboard and Mouse", NULL, NULL);
if( window == NULL ){
fprintf( stderr, "Failed to open GLFW window. If you have an Intel GPU, they are not 3.3 compatible. Try the 2.1 version of the tutorials.n" );
getchar();
glfwTerminate();
return -1;
}
glfwMakeContextCurrent(window);
// Initialize GLEW
glewExperimental = true; // Needed for core profile
if (glewInit() != GLEW_OK) {
fprintf(stderr, "Failed to initialize GLEWn");
getchar();
glfwTerminate();
return -1;
}
// Ensure we can capture the escape key being pressed below
glfwSetInputMode(window, GLFW_STICKY_KEYS, GL_TRUE);
// Hide the mouse and enable unlimited mouvement
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
// Set the mouse at the center of the screen
glfwPollEvents();
glfwSetCursorPos(window, 1024/2, 768/2);
// Dark blue background
//glClearColor(0.0f, 0.0f, 0.4f, 0.0f);
// Enable depth test
glEnable(GL_DEPTH_TEST);
// Accept fragment if it closer to the camera than the former one
glDepthFunc(GL_LESS); 
// Cull triangles which normal is not towards the camera
glEnable(GL_CULL_FACE);
GLuint VertexArrayID;
glGenVertexArrays(1, &VertexArrayID);
glBindVertexArray(VertexArrayID);
// Create and compile our GLSL program from the shaders
GLuint programID = LoadShaders( "TransformVertexShader.vertexshader", "TextureFragmentShader.fragmentshader");
GLuint skyboxShader = LoadShaders("skybox.FragmentShader", "skybox.VertexShader");


// Get a handle for our "MVP" uniform
GLuint MatrixID = glGetUniformLocation(programID, "MVP");
GLuint ModelMatrixID = glGetUniformLocation(programID, "M");
GLuint ViewMatrixID = glGetUniformLocation(programID, "V");

// Load the texture
GLuint Texture = loadDDS("uvtemplate.DDS");




// Get a handle for our "myTextureSampler" uniform
GLuint TextureID  = glGetUniformLocation(programID, "myTextureSampler");

//static GLuint terrainVbo = 0, terraininVboNorm = 0, terrainEbo = 0;
//static int terrainCount = 0;


//skyboxvertieces


float skyboxVertices[] = {
// positions          
-1.0f,  1.0f, -1.0f,
-1.0f, -1.0f, -1.0f,
1.0f, -1.0f, -1.0f,
1.0f, -1.0f, -1.0f,
1.0f,  1.0f, -1.0f,
-1.0f,  1.0f, -1.0f,
-1.0f, -1.0f,  1.0f,
-1.0f, -1.0f, -1.0f,
-1.0f,  1.0f, -1.0f,
-1.0f,  1.0f, -1.0f,
-1.0f,  1.0f,  1.0f,
-1.0f, -1.0f,  1.0f,
1.0f, -1.0f, -1.0f,
1.0f, -1.0f,  1.0f,
1.0f,  1.0f,  1.0f,
1.0f,  1.0f,  1.0f,
1.0f,  1.0f, -1.0f,
1.0f, -1.0f, -1.0f,
-1.0f, -1.0f,  1.0f,
-1.0f,  1.0f,  1.0f,
1.0f,  1.0f,  1.0f,
1.0f,  1.0f,  1.0f,
1.0f, -1.0f,  1.0f,
-1.0f, -1.0f,  1.0f,
-1.0f,  1.0f, -1.0f,
1.0f,  1.0f, -1.0f,
1.0f,  1.0f,  1.0f,
1.0f,  1.0f,  1.0f,
-1.0f,  1.0f,  1.0f,
-1.0f,  1.0f, -1.0f,
-1.0f, -1.0f, -1.0f,
-1.0f, -1.0f,  1.0f,
1.0f, -1.0f, -1.0f,
1.0f, -1.0f, -1.0f,
-1.0f, -1.0f,  1.0f,
1.0f, -1.0f,  1.0f
};




// Our vertices. Tree consecutive floats give a 3D vertex; Three consecutive vertices give a triangle.
// A cube has 6 faces with 2 triangles each, so this makes 6*2=12 triangles, and 12*3 vertices
static const GLfloat g_vertex_buffer_data[] = { 
-1.0f,-1.0f,-1.0f,
-1.0f,-1.0f, 1.0f,
-1.0f, 1.0f, 1.0f,
1.0f, 1.0f,-1.0f,
-1.0f,-1.0f,-1.0f,
-1.0f, 1.0f,-1.0f,
1.0f,-1.0f, 1.0f,
-1.0f,-1.0f,-1.0f,
1.0f,-1.0f,-1.0f,
1.0f, 1.0f,-1.0f,
1.0f,-1.0f,-1.0f,
-1.0f,-1.0f,-1.0f,
-1.0f,-1.0f,-1.0f,
-1.0f, 1.0f, 1.0f,
-1.0f, 1.0f,-1.0f,
1.0f,-1.0f, 1.0f,
-1.0f,-1.0f, 1.0f,
-1.0f,-1.0f,-1.0f,
-1.0f, 1.0f, 1.0f,
-1.0f,-1.0f, 1.0f,
1.0f,-1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
1.0f,-1.0f,-1.0f,
1.0f, 1.0f,-1.0f,
1.0f,-1.0f,-1.0f,
1.0f, 1.0f, 1.0f,
1.0f,-1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
1.0f, 1.0f,-1.0f,
-1.0f, 1.0f,-1.0f,
1.0f, 1.0f, 1.0f,
-1.0f, 1.0f,-1.0f,
-1.0f, 1.0f, 1.0f,
1.0f, 1.0f, 1.0f,
-1.0f, 1.0f, 1.0f,
1.0f,-1.0f, 1.0f
};


// Two UV coordinatesfor each vertex. They were created with Blender.
static const GLfloat g_uv_buffer_data[] = { 
0.000059f, 0.000004f, 
0.000103f, 0.336048f, 
0.335973f, 0.335903f, 
1.000023f, 0.000013f, 
0.667979f, 0.335851f, 
0.999958f, 0.336064f, 
0.667979f, 0.335851f, 
0.336024f, 0.671877f, 
0.667969f, 0.671889f, 
1.000023f, 0.000013f, 
0.668104f, 0.000013f, 
0.667979f, 0.335851f, 
0.000059f, 0.000004f, 
0.335973f, 0.335903f, 
0.336098f, 0.000071f, 
0.667979f, 0.335851f, 
0.335973f, 0.335903f, 
0.336024f, 0.671877f, 
1.000004f, 0.671847f, 
0.999958f, 0.336064f, 
0.667979f, 0.335851f, 
0.668104f, 0.000013f, 
0.335973f, 0.335903f, 
0.667979f, 0.335851f, 
0.335973f, 0.335903f, 
0.668104f, 0.000013f, 
0.336098f, 0.000071f, 
0.000103f, 0.336048f, 
0.000004f, 0.671870f, 
0.336024f, 0.671877f, 
0.000103f, 0.336048f, 
0.336024f, 0.671877f, 
0.335973f, 0.335903f, 
0.667969f, 0.671889f, 
1.000004f, 0.671847f, 
0.667979f, 0.335851f
};
//Skybox 


GLuint skyboxVAO, skyboxVBO;
glGenVertexArrays(1, &skyboxVAO);
glGenBuffers(1,&skyboxVBO);
glBindVertexArray(skyboxVAO);
glBindBuffer(GL_ARRAY_BUFFER, skyboxVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(skyboxVertices), &skyboxVertices, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT,GL_FALSE, 3 * sizeof(GLfloat), (GLvoid*)0);
glBindVertexArray(0);
//skybox image faces
std::vector <std::string>faces;
{
"right.BMP",
"left.BMP",
"top.BMP",
"bottom.BMP",
"front.BMP",
"back.BMP";
};
unsigned int CubemapTexture = loadCubemap(faces);





GLuint vertexbuffer;
glGenBuffers(1, &vertexbuffer);
glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(g_vertex_buffer_data), g_vertex_buffer_data, GL_STATIC_DRAW);
GLuint uvbuffer;
glGenBuffers(1, &uvbuffer);
glBindBuffer(GL_ARRAY_BUFFER, uvbuffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(g_uv_buffer_data), g_uv_buffer_data, GL_STATIC_DRAW);
do{
// Clear the screen
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Use our shader
glUseProgram(programID);
glUseProgram(skyboxShader);
// Compute the MVP matrix from keyboard and mouse input
computeMatricesFromInputs();
glm::mat4 ProjectionMatrix = getProjectionMatrix();
glm::mat4 ViewMatrix = getViewMatrix();
glm::mat4 ModelMatrix = glm::mat4(1.0);
glm::mat4 MVP = ProjectionMatrix * ViewMatrix * ModelMatrix;

glm::mat4 view = glm::mat4(glm::mat3(getViewMatrix()));

//  skybox Uniform                      INCLUDE glm value_PTR.hpp
glUniformMatrix4fv(glGetUniformLocation(skyboxShader, "view"), 1,  GL_FALSE, glm::value_ptr(view));
glUniformMatrix4fv(glGetUniformLocation(skyboxShader, "projection"), 1, GL_FALSE, glm::value_ptr(ProjectionMatrix));


// Send our transformation to the currently bound shader, 
// in the "MVP" uniform
glUniformMatrix4fv(MatrixID, 1, GL_FALSE, &MVP[0][0]);
// Bind our texture in Texture Unit 0
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, Texture);
// Set our "myTextureSampler" sampler to use Texture Unit 0
glUniform1i(TextureID, 0);




// 1rst attribute buffer : vertices
glEnableVertexAttribArray(0);
glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer);
glVertexAttribPointer(
0,                  // attribute. No particular reason for 0, but must match the layout in the shader.
3,                  // size
GL_FLOAT,           // type
GL_FALSE,           // normalized?
0,                  // stride
(void*)0            // array buffer offset
);
// 2nd attribute buffer : UVs
glEnableVertexAttribArray(1);
glBindBuffer(GL_ARRAY_BUFFER, uvbuffer);
glVertexAttribPointer(
1,                                // attribute. No particular reason for 1, but must match the layout in the shader.
2,                                // size : U+V => 2
GL_FLOAT,                         // type
GL_FALSE,                         // normalized?
0,                                // stride
(void*)0                          // array buffer offset
);
// Draw the triangle !
glDrawArrays(GL_TRIANGLES, 0, 12*3); // 12*3 indices starting at 0 -> 12 triangles


glm::mat4 ModelMatrix2 = glm::mat4(1.0);
ModelMatrix2 = glm::translate(ModelMatrix2, glm::vec3(2.0f, 0.0f, 0.0f));
glm::mat4 MVP2 = ProjectionMatrix * ViewMatrix * ModelMatrix2;
glUniformMatrix4fv(MatrixID, 1, GL_FALSE, &MVP2[0][0]);
glUniformMatrix4fv(ModelMatrixID, 1, GL_FALSE, &ModelMatrix2[0][0]);


// 2nd object
glDrawArrays(GL_TRIANGLES, 0, 12 * 3);

// 1rst attribute buffer : vertices
glEnableVertexAttribArray(0);
glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (void*)0);
// 2nd attribute buffer : UVs
glEnableVertexAttribArray(1);
glBindBuffer(GL_ARRAY_BUFFER, uvbuffer);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0, (void*)0);



glDisableVertexAttribArray(0);
glDisableVertexAttribArray(1);
//newshit
glBindVertexArray(skyboxVAO);
glDepthFunc(GL_LEQUAL);
glUseProgram(skyboxShader);
glBindTexture(GL_TEXTURE_CUBE_MAP, CubemapTexture);
glDrawArrays(GL_TRIANGLES, 0, 36);
glBindVertexArray(0);
glDepthFunc(GL_LESS);



// Swap buffers
glfwSwapBuffers(window);
glfwPollEvents();
} // Check if the ESC key was pressed or the window was closed
while( glfwGetKey(window, GLFW_KEY_ESCAPE ) != GLFW_PRESS &&
glfwWindowShouldClose(window) == 0 );
// Cleanup VBO and shader
glDeleteBuffers(1, &vertexbuffer);
glDeleteBuffers(1, &uvbuffer);
glDeleteProgram(programID);
glDeleteTextures(1, &TextureID);
glDeleteVertexArrays(1, &VertexArrayID);
// Close OpenGL window and terminate GLFW
glfwTerminate();
return 0;

}

这是天空盒顶点着色器

#version 330 core
layout (location = 0) in vec3 position;
out vec3 TexCoords;

uniform mat4 projection;
uniform mat4 view;


out gl_PerVertex
{

vec4 gl_position;
}
ERROR: 0:22: 'void' : syntax error syntax error
void main()     <--?? error
{
vec4 pos = projection * view * vec4(position, 1.0);
gl_Position = pos.xyww;
TexCoords = position; 
}

天空盒碎片着色器 #version 330 核

in vec3 TexCoords;
out vec4 color;
uniform samplerCube skybox;
void main()
{    
color = texture(skybox, TexCoords);
}