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問題： 我試圖寫一個類來繪製可點擊的矩形問題是，因爲我開始在程序中使用新的OpenGL版本（4.0）它不呈現並在位置0x00000000上讀取時給我提供運行時錯誤錯誤。 我將包括類的代碼以及底部的主循環。OpenGL應用程序與GLFW和GLEW崩潰
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();
}
編輯： 我在同一個文件複製所有的代碼錯誤解決，但它仍然沒有呈現
#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();
}
使用跟蹤陳述或者調試器，試圖隔離*，其中*發生了故障。除此之外，在調用'glewInit（）'之前嘗試調用'glewExperimental = true;'' –
你調用了'glewInit（）'嗎？ – concept3d
是的，我沒有添加初始化階段，但glew設置正確。另外碰撞發生在glDrawArrays我忘了提及它 – Deathlymad