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爲了理解如何使用兩個緩衝區並將其綁定到vao,我試圖顯示帶有某種顏色的三角形。我遇到這樣的錯誤在初始化vao(glCreateVertexArrays())時出錯
ConsoleApplication12.exe中0x00000000的第一次機會異常:0xC0000005:執行位置0x00000000的訪問衝突。
當我嘗試調試,這錯誤是由行中的代碼
glCreateVertexArrays(1,& VAO)引起的;
我沒有初始化vao,但我不明白爲什麼發生錯誤。請幫我..
下面是代碼
#include <stdlib.h>
#include<iostream>
#include <GL/glew.h>
#include <GL/freeglut.h>
#include "glm/glm.hpp"
#define BUFFER_OFFSET(offset) ((GLvoid *) offset)
GLuint program;
static int timeFor =0;
GLuint vPos;
GLuint buffer[2];
GLuint vao = 0;
void init()
{
static const GLfloat positions[] = { 0.1f, 0.2f, 0.3f, 0.0f};
static const GLfloat colors[] = { 1.0f, 0.0f, 0.0f, 1.0f};
glCreateVertexArrays(1, &vao);
glCreateBuffers(2, &buffer[0]);
glNamedBufferStorage(buffer[0], sizeof(positions), positions, 0);
glVertexArrayVertexBuffer(vao, 0, buffer[0], 0, sizeof(glm::vec4));
glVertexArrayAttribFormat(vao, 0, 4, GL_FLOAT, GL_FALSE, 0);
glVertexArrayAttribBinding(vao, 0, 0);
glNamedBufferStorage(buffer[1], sizeof(colors), colors, 0);
glVertexArrayVertexBuffer(vao, 1, buffer[1], 0, sizeof(glm::vec4));
glVertexArrayAttribFormat(vao, 1, 4, GL_FLOAT, GL_FALSE, 0);
glVertexArrayAttribBinding(vao, 1, 1);
const char* vSource = {
"#version 330\n"
"layout (location = 0) in vec4 offset;"
"layout (location = 1) in vec4 color;"
"out vec4 fColor;"
"void main() {"
"const vec4 vertices[3] = vec4[3](vec4(0.25, -0.25, 0.5, 1.0), vec4(-0.25, -0.25, 0.5, 1.0), vec4(0.25, 0.25, 0.5, 1.0));"
"gl_Position = vertices[gl_VertexID] + offset;"
"fColor = color;"
"}"
};
const char* fSource = {
"#version 330\n"
"in vec4 fColor;"
"out vec4 fragColor;"
"void main() {"
"fragColor = fColor;"
"}"
};
GLuint vShader, fShader;
vShader = glCreateShader(GL_VERTEX_SHADER);
fShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(vShader, 1, &vSource, NULL);
glShaderSource(fShader, 1, &fSource, NULL);
glCompileShader(vShader);
glCompileShader(fShader);
program = glCreateProgram();
glAttachShader(program, vShader);
glAttachShader(program, fShader);
glLinkProgram(program);
glClearColor(1.0f, 1.0f, 0.0f, 1.0f);
}
void reshape(int width, int height)
{
glViewport(0, 0, width, height);
}
void display()
{
glClear(GL_COLOR_BUFFER_BIT);
glUseProgram(program);
glDrawArrays(GL_TRIANGLES, 0, 3);
glutSwapBuffers();
}
void main(int argc, char *argv[])
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE);
glutCreateWindow(argv[0]);
glewInit();
init();
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutMainLoop();
}
看起來像glew沒有得到'glGenVertexArrays'函數指針。確保它在您的實施中受到支持。假設功能是沒有正確的方式來使用GL版本/擴展。 – derhass
啓用'glewExperimental = GL_TRUE'看看是否可以解決您的問題。 – Poriferous
@Poriferous:感謝您的回覆,我已經啓用之前初始化glew,即glewInit()之前,但仍然沒有工作,拋出相同的錯誤 – spod