问题： 我试着写一个类来绘制可点击的矩形问题是因为我开始在程序中使用新的OpenGL版本（4.0）它不会渲染并且在读取位置0x00000000时给出了运行时错误错误。 我将包括类的代码以及底部的主循环。
GUI::GUI(std::string name, int top, int left,int heigh, int width, bool isvisible, void(_cdecl * func)())
{
Name=name;
Top=top;
Left=left;
Heigh=heigh;
Width=width;
BackColor = struct_RGB();
glClearColor(0.0f, 0.0f, 0.4f, 1.0f);
BackDrawFunc=func;
Visibility=isvisible;
GuiObj = std::vector<GUIOBJ *>();
vertices = std::vector<float>();
vertices.clear();
for(unsigned int i=0; i<GuiObj.size(); i++)
{
GuiObj[i]->addVertices();
};
glGenVertexArrays(1, &VertexArrayID);
glBindVertexArray(VertexArrayID);
// Generate 1 buffer, put the resulting identifier in vertexbuffer
glGenBuffers(1, &VBO);
// The following commands will talk about our 'vertexbuffer' buffer
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(float), vertices.data(), GL_STATIC_DRAW);
program = LoadShaders("res/VertexShader.glsl", "res/FragmentShader.glsl");
}
void GUI::Draw()
{
glClear(GL_COLOR_BUFFER_BIT);
// Use our shader
glUseProgram(program);
// 1rst attribute buffer : vertices
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glEnableVertexAttribArray(0);
glVertexAttribPointer(
0, // attribute 0. No particular reason for 0, but must match the layout in the shader.
vertices.size(), // size
GL_FLOAT, // type
GL_FALSE, // normalized?
0, // stride
(void*)0 // array buffer offset
);
// Draw the triangle !
glDrawArrays(GL_TRIANGLES, 0, vertices.size()); // 3 indices starting at 0 -> 1 triangle
printf("drawing\n");
glDisableVertexAttribArray(0);
}
void main()
{
init();
//Main Loop
while(!glfwWindowShouldClose(Window))
{
if (glfwGetKey(Window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
glfwSetWindowShouldClose(Window, GL_TRUE);
Test->Draw();
glfwSwapBuffers(Window);
glfwPollEvents();
}
//Termination
glfwTerminate();
}
编辑： 我复制了同一文件中的所有代码，但错误已解决但仍无法呈现
#include "extincludes.h"
#include <vector>
#include <fstream>
#include <sstream>
GLFWwindow* Window;
typedef unsigned int GLuint;
GLuint VertexArrayID;
GLuint VBO;
GLuint program;
GLuint LoadShaders(const char * vertex_file_path,const char * fragment_file_path){
// Create the shaders
GLuint VertexShaderID = glCreateShader(GL_VERTEX_SHADER);
GLuint FragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
// Read the Vertex Shader code from the file
std::string VertexShaderCode;
std::ifstream VertexShaderStream = std::ifstream(vertex_file_path, std::ios::in);
if (!VertexShaderStream.is_open()) VertexShaderStream.open(vertex_file_path, std::ios::in);
if(VertexShaderStream.is_open())
{
std::string Line = "";
while(getline(VertexShaderStream, Line))
VertexShaderCode += "\n" + Line;
VertexShaderStream.close();
} else
printf("Couldn't open VertexShader");
// Read the Fragment Shader code from the file
std::string FragmentShaderCode;
std::ifstream FragmentShaderStream(fragment_file_path, std::ios::in);
if(FragmentShaderStream.is_open()){
std::string Line = "";
while(getline(FragmentShaderStream, Line))
FragmentShaderCode += "\n" + Line;
FragmentShaderStream.close();
} else
printf("Couldn't open FragmentShader");
GLint Result = GL_FALSE;
int InfoLogLength;
// Compile Vertex Shader
printf("Compiling shader : %s\n", vertex_file_path);
char const * VertexSourcePointer = VertexShaderCode.c_str();
glShaderSource(VertexShaderID, 1, &VertexSourcePointer , NULL);
glCompileShader(VertexShaderID);
// Check Vertex Shader
glGetShaderiv(VertexShaderID, GL_COMPILE_STATUS, &Result);
glGetShaderiv(VertexShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
std::vector<char> VertexShaderErrorMessage(InfoLogLength);
glGetShaderInfoLog(VertexShaderID, InfoLogLength, NULL, &VertexShaderErrorMessage[0]);
fprintf(stdout, "%s\n", &VertexShaderErrorMessage[0]);
// Compile Fragment Shader
printf("Compiling shader : %s\n", fragment_file_path);
char const * FragmentSourcePointer = FragmentShaderCode.c_str();
glShaderSource(FragmentShaderID, 1, &FragmentSourcePointer , NULL);
glCompileShader(FragmentShaderID);
// Check Fragment Shader
glGetShaderiv(FragmentShaderID, GL_COMPILE_STATUS, &Result);
glGetShaderiv(FragmentShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
std::vector<char> FragmentShaderErrorMessage(InfoLogLength);
glGetShaderInfoLog(FragmentShaderID, InfoLogLength, NULL, &FragmentShaderErrorMessage[0]);
fprintf(stdout, "%s\n", &FragmentShaderErrorMessage[0]);
// Link the program
fprintf(stdout, "Linking program\n");
GLuint ProgramID = glCreateProgram();
glAttachShader(ProgramID, VertexShaderID);
glAttachShader(ProgramID, FragmentShaderID);
glLinkProgram(ProgramID);
// Check the program
glGetProgramiv(ProgramID, GL_LINK_STATUS, &Result);
glGetProgramiv(ProgramID, GL_INFO_LOG_LENGTH, &InfoLogLength);
std::vector<char> ProgramErrorMessage( glm::max(InfoLogLength, int(1)) );
glGetProgramInfoLog(ProgramID, InfoLogLength, NULL, &ProgramErrorMessage[0]);
fprintf(stdout, "%s\n", &ProgramErrorMessage[0]);
glDeleteShader(VertexShaderID);
glDeleteShader(FragmentShaderID);
return ProgramID;
}
void main()
{
//GLFW
printf("started init of GLFW \n");
if (!glfwInit())
printf("startup of GLFW errored \n");
printf("started GLFW \n");
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); //excluding old openGL functionality
Window = glfwCreateWindow(640, 768, "Simple example", NULL, NULL);
printf("attempt to create window \n");
if (!Window)
{
glfwTerminate();
exit(EXIT_FAILURE);
}
glfwMakeContextCurrent(Window);
printf("Init of GLFW done \n");
//GLEW
printf("start init of GLEW \n");
glewExperimental = true; // Needed for core profile
printf("using experimental version of GLEW\n");
if (glewInit() != GLEW_OK) {
printf("Failed to initialize GLEW\n");
}
printf("done with GLEW\n");
if (glfwGetCurrentContext()!=Window)
printf("context error");
glClearColor(1.0f, 0.0f, 0.0f, 1.0f);
glGenVertexArrays(1, &VertexArrayID);
glBindVertexArray(VertexArrayID);
program = LoadShaders("res/VertexShader.glsl", "res/FragmentShader.glsl");
std::vector<float> vertices = std::vector<float>();
vertices.clear();
//triangle 1
vertices.push_back(1);
vertices.push_back(1);
vertices.push_back(0);
vertices.push_back(1);
vertices.push_back(0);
vertices.push_back(3);
//triangle 2
vertices.push_back(1);
vertices.push_back(1);
vertices.push_back(0);
vertices.push_back(1);
vertices.push_back(0);
vertices.push_back(3);
// Generate 1 buffer, put the resulting identifier in vertexbuffer
glGenBuffers(1, &VBO);
// The following commands will talk about our 'vertexbuffer' buffer
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(float), &vertices[0], GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(
0, // attribute 0. 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
);
//Main Loop
while(!glfwWindowShouldClose(Window))
{
if (glfwGetKey(Window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
glfwSetWindowShouldClose(Window, GL_TRUE);
glClear(GL_COLOR_BUFFER_BIT);
// Use our shader
glUseProgram(program);
// 1rst attribute buffer : vertices
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBindVertexArray(VertexArrayID);
// Draw the triangle !
printf("everything setup we can draw \n");
glDrawArrays(GL_TRIANGLES, 0, vertices.size()); // 3 indices starting at 0 -> 1 triangle
printf("drawing\n");
glfwSwapBuffers(Window);
glfwPollEvents();
}
//Termination
glDisableVertexAttribArray(0);
glfwDestroyWindow(Window);
glfwTerminate();
}
答案 0 :(得分：0)
我认为崩溃的错误只是你需要三个维度而不是一个维度。这导致绘制函数读数超出范围的错误....