[英]Exception thrown at 0x00000000 in CobwebDiagram.exe: 0xC0000005: Access violation executing location 0x00000000
[英]Exception thrown at 0x00000000 in Project0_opengl.exe: 0xC0000005: Access violation executing location 0x00000000
我正在编写正确的代码,但编译器抛出错误。 该错误表示错误出在glGenBuffers
但我已从官方网站复制了它。 我的错误在哪里?
#include <GL/glew.h>
#include <GLFW/glfw3.h>
#include <stdio.h>
int main(void)
{
GLFWwindow* window;
glewExperimental = GL_TRUE;
/* Initialize the library */
if (!glfwInit())
return -1;
/* Create a windowed mode window and its OpenGL context */
window = glfwCreateWindow(640, 480, "Hello World", NULL, NULL);
if (!window)
{
glfwTerminate();
return -1;
}
/* Make the window's context current */
glfwMakeContextCurrent(window);
float pos[6] = {
-0.5f, -0.5f,
0.0f, 0.5f,
0.5f, -0.5f
};
GLuint buf;
glGenBuffers(1, &buf);
glBindBuffer(GL_ARRAY_BUFFER, buf);
glBufferData(GL_ARRAY_BUFFER, 6 * sizeof(float), pos, GL_STATIC_DRAW);
if (glewInit() != GLEW_OK)
printf("Error\n");
printf("%s", glGetString(GL_VERSION));
/* Loop until the user closes the window */
while (!glfwWindowShouldClose(window))
{
/* Render here */
glClear(GL_COLOR_BUFFER_BIT);
glDrawArrays(GL_TRIANGLES, 0, 3);
/* Swap front and back buffers */
glfwSwapBuffers(window);
/* Poll for and process events */
glfwPollEvents();
}
glfwTerminate();
return 0;
}
glewInit()
必须在 OpenGL 上下文glfwMakeContextCurrent
当前之后,在glfwMakeContextCurrent
之后glfwMakeContextCurrent
。
但它必须在任何 OpenGL 指令之前调用。 另请参阅初始化 GLEW :
// [...]
/* Make the window's context current */
glfwMakeContextCurrent(window);
glewExperimental = GL_TRUE;
if (glewInit() != GLEW_OK)
printf("Error\n");
float pos[6] = {
-0.5f, -0.5f,
0.0f, 0.5f,
0.5f, -0.5f
};
GLuint buf;
glGenBuffers(1, &buf);
glBindBuffer(GL_ARRAY_BUFFER, buf);
glBufferData(GL_ARRAY_BUFFER, 6 * sizeof(float), pos, GL_STATIC_DRAW);
// [...]
注意,像glGenBuffers
这样的指令是函数指针。 这些指针被初始化为NULL
。 glewInit()
将函数的地址分配给这些指针。
当您尝试调用该函数时,在初始化之前,这会导致:
访问冲突执行位置 0x00000000
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