QT OpenGL rotate, pan, zoom

Qt OpenGL Set the rotation 、 translation 、 The zoom . Follow up on the last article ：
Qt OpenGL Texture mapping
Modify vertex shaders ：

#version 330 core
layout (location = 0) in vec3 aPos;
layout (location = 1) in vec3 aColor;
layout (location = 2) in vec2 aTextureCoord;
out vec3 outColor;
out vec2 textureCoord;

// Matrix must be initialized , Initialize identity matrix , otherwise GLSL The default matrix in the language is 0 matrix 
uniform mat4 trans = mat4(1.0);

void main(){
    
	gl_Position = trans * vec4(aPos.x, aPos.y, aPos.z, 1.0);// In matrix multiplication, it is right times left , Different from the multiplication of explicit reality 
	outColor = aColor;
	textureCoord = aTextureCoord;
}

Modify the code ：

void TextureWnd::paintGL() {
    
	_openGLCore->glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
	_openGLCore->glClear(GL_COLOR_BUFFER_BIT);

	_shaderProgram.bind();
	_openGLCore->glBindVertexArray(_VAO);

	_openGLCore->glActiveTexture(GL_TEXTURE0);
	_texture->bind(0);
	_openGLCore->glActiveTexture(GL_TEXTURE1);
	_texture2->bind(1);

	QMatrix4x4 mat4;// The default is the identity matrix 
	//mat4.scale(1.5); The zoom 
	//mat4.translate(0.3, 0.3, 0.0);
	mat4.rotate(45.0f, QVector3D(0.0, 0.0, 1.0));
	_shaderProgram.setUniformValue("trans", mat4);

	_openGLCore->glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, nullptr);
}

rotate

translation

The zoom

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