QOpenGLWidget不拉丝阵列 [英] QOpenGLWidget not drawing array
问题描述
you're我对这个问题,因为林的想法最后手段。
所以首先我已经做了一些openGL的东西,但不与Qt库。
you´re my last resort for this question because Im out of ideas. So first of all I have already done some openGL stuff but not with the Qt Libraries.
由于我有,因为Qt的Android的编译器的Qt库做到这一点,围绕那里有没有办法对我来说。
And since I HAVE to do it with Qt Libraries because of the Qt Android compiler, theres no way around for me.
所以我试图得出一些顶点坐标像正常的openGL。
保存float数组等..点
所以我hoppyfully做出了正确的VAO,VBO ..着色器..但它不需额外画什么。
paintGL()只画的东西,如果它很难$ C $光盘在glBegin和结束。
So I was trying to draw some vertex coordinates like in normal openGL. Save points in float array etc.. So I hoppyfully made the right vao, vbo.. shader.. but it won´t draw anything. paintGL() only draws something if its hardcoded with glBegin and end.
请告诉我,从来就出了问题,并从我的痛苦释放我^^
啊,是的已经有像我一个问题,这里但没有答案,所以我想再次尝试。
Please tell me where I´ve gone wrong and release me from my suffering^^ Ah and yes there is already a questions like mine Here but there was no answer so I want to try it again.
- MainWidget头:
--MainWidget Header:
#ifndef MAINWIDGET_H
#define MAINWIDGET_H
#include <QOpenGLWidget>
#include <QOpenGLFunctions>
#include <QVector2D>
#include <QOpenGLShaderProgram>
#include <QOpenGLBuffer>
#include <QVector3D>
#include <QOpenGLVertexArrayObject>
class MainWidget : public QOpenGLWidget, protected QOpenGLFunctions
{
Q_OBJECT
public:
MainWidget(QWidget *parent = 0);
~MainWidget();
protected:
void initializeGL() Q_DECL_OVERRIDE;
void resizeGL(int w, int h) Q_DECL_OVERRIDE;
void paintGL() Q_DECL_OVERRIDE;
GLfloat vertices[9];
private:
QOpenGLShaderProgram program;
QOpenGLBuffer arrayBuf;
QOpenGLVertexArrayObject vertexArrayID;
};
#endif // MAINWIDGET_H
- MainWidget .cpp的:
-- MainWidget Cpp:
#include "mainwidget.h"
MainWidget::MainWidget(QWidget *parent): QOpenGLWidget(parent){
}
MainWidget::~MainWidget(){
}
void MainWidget::initializeGL(){
initializeOpenGLFunctions();
glClearColor(0, 0, 0.4f, 0);
glEnable(GL_DEPTH_TEST);
//glEnable(GL_CULL_FACE);
static const GLfloat g_vertex_buffer_data[] = {
-1.0f, -1.0f, 0.0f,
1.0f, -1.0f, 0.0f,
0.0f, 1.0f, 0.0f
};
for(int i = 0; i < 9; i++){
vertices[i] = g_vertex_buffer_data[i];
}
vertexArrayID.create();
vertexArrayID.bind();
program.addShaderFromSourceFile(QOpenGLShader::Vertex, "vertex.vert");
program.addShaderFromSourceFile(QOpenGLShader::Fragment, "fragment.frag");
program.link();
program.bind();
arrayBuf.create();
arrayBuf.bind();
arrayBuf.allocate(&vertices, 9 * sizeof(GLfloat));
/* glGenBuffers(1, &arrayBuf);
glBindBuffer(GL_ARRAY_BUFFER, arrayBuf);*/
glBufferData(GL_ARRAY_BUFFER, sizeof(g_vertex_buffer_data), g_vertex_buffer_data, GL_STATIC_DRAW);
}
void MainWidget::resizeGL(int w, int h){
}
void MainWidget::paintGL(){
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
arrayBuf.bind();
arrayBuf.allocate(&vertices, 9*sizeof(GLfloat));
int vertexLocation = program.attributeLocation("vertex");
program.enableAttributeArray("vertexLocation");
program.setAttributeBuffer(vertexLocation, GL_FLOAT, 0, 3, sizeof(GLfloat) );
//glDrawElements(GL_TRIANGLES, 3, GL_UNSIGNED_SHORT, 0);
glDrawArrays(GL_TRIANGLES, 0, 3);
glDisableVertexAttribArray(0);
}
- 主.cpp的:
--Main Cpp:
#include <QApplication>
#include <QLabel>
#include <QSurfaceFormat>
#ifndef QT_NO_OPENGL
#include "mainwidget.h"
#endif
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QSurfaceFormat format;
format.setDepthBufferSize(24);
QSurfaceFormat::setDefaultFormat(format);
app.setApplicationName("GLtest");
#ifndef QT_NO_OPENGL
MainWidget widget;
widget.show();
#else
QLabel note("OpenGL Support required");
note.show();
#endif
return app.exec();
}
- 顶点着色引擎尽可能地简单:
--Vertex Shader as easy as possible:
#version 330
layout(location = 0) in vec3 vertex;
void main(){
gl_Position = vec4(vertex, 1.0);
}
- 片段着色器:
--Fragment Shader:
#version 330
out vec3 color;
void main(){
color = vec3(1,0,0);
}
在此先感谢..任何形式的帮助是值得欢迎的!
干杯
Thanks in advance.. any kind of help is welcome! Cheers
推荐答案
您正在使错了顶点属性:
You are enabling the wrong vertex attribute:
program.enableAttributeArray("vertexLocation");
这应该要么(不是失踪)
It should either be (not the missing ")
program.enableAttributeArray(vertexLocation);
或(正确名称)
program.enableAttributeArray("vertex");
这篇关于QOpenGLWidget不拉丝阵列的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!