@shome said in Is openGL, GLU, GLUT not supported in qt for wasm:
My actual code uses the opengl functions gluPerspective, glShadeModel, glLightModelfv, glLightfv, glColorMaterial, glMaterialfv, glLightModeli, glTranslatef, and glMultMatrixd.
WebGL doesn't support these functions. You should use OpenGL ES, shaders and QMatrix4x4 instead.
My example can help you. It draws a triangle. You can run it in the browser: https://65fb01d024b197009c29122c--lustrous-croissant-656612.netlify.app/ It is a free hosting: netlify.com My example uses QOpenGLWindow instead of QOpenGLWidget. QOpenGLWindow is better for WebAssembly.
pro:
QT += core gui opengl widgets
win32: LIBS += -lopengl32
CONFIG += c++17
SOURCES += \
main.cpp
main.cpp
#include <QtGui/QOpenGLFunctions>
#include <QtGui/QSurfaceFormat>
#include <QtOpenGL/QOpenGLBuffer>
#include <QtOpenGL/QOpenGLWindow>
#include <QtOpenGL/QOpenGLShaderProgram>
#include <QtWidgets/QApplication>
class OpenGLWindow : public QOpenGLWindow, private QOpenGLFunctions
{
public:
OpenGLWindow()
{
resize(350, 350);
setTitle("OpenGL ES 2.0 Triangle");
}
private:
void initializeGL() override
{
initializeOpenGLFunctions();
glClearColor(0.4f, 0.8f, 0.9f, 1.f);
qDebug() << "OpenGL Version:" << (const char*) glGetString(GL_VERSION) << "\n";
qDebug() << "GLSL Version:" << (const char*) glGetString(GL_SHADING_LANGUAGE_VERSION) << "\n";
qDebug() << "OpenGL Vendor:" << (const char*) glGetString(GL_VENDOR) << "\n";
QString vertexShaderSource =
"attribute vec2 aPosition;\n"
"void main()\n"
"{\n"
" gl_Position = vec4(aPosition, 0.0, 1.0);\n"
"}\n";
QString fragmentShaderSource =
"#ifdef GL_ES\n"
"precision mediump float;\n"
"#endif\n"
"void main()\n"
"{\n"
" gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);\n"
"}\n";
m_program.create();
m_program.addShaderFromSourceCode(QOpenGLShader::ShaderTypeBit::Vertex,
vertexShaderSource);
m_program.addShaderFromSourceCode(QOpenGLShader::ShaderTypeBit::Fragment,
fragmentShaderSource);
m_program.link();
m_program.bind();
float vertPositions[] = {
-0.5f, -0.5f,
0.5f, -0.5f,
0.f, 0.5f
};
m_vertPosBuffer.create();
m_vertPosBuffer.bind();
m_vertPosBuffer.allocate(vertPositions, sizeof(vertPositions));
}
void paintGL() override
{
m_program.bind();
m_vertPosBuffer.bind();
m_program.setAttributeBuffer("aPosition", GL_FLOAT, 0, 2);
m_program.enableAttributeArray("aPosition");
glClearColor(0.4f, 0.8f, 0.9f, 1.f);
glClear(GL_COLOR_BUFFER_BIT);
glDrawArrays(GL_TRIANGLES, 0, 3);
}
private:
QOpenGLShaderProgram m_program;
QOpenGLBuffer m_vertPosBuffer;
};
int main(int argc, char *argv[])
{
QApplication::setAttribute(Qt::ApplicationAttribute::AA_UseDesktopOpenGL);
QApplication app(argc, argv);
OpenGLWindow w;
w.show();
return app.exec();
}
