Qt OpenGL 旋转、平移、缩放

Qt OpenGL 设置旋转、平移、缩放。接上一篇文章：
Qt OpenGL 纹理贴图
修改顶点着色器：

#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;

//矩阵必须初始化，初始化单位矩阵，否则GLSL语言中默认矩阵是0矩阵
uniform mat4 trans = mat4(1.0);

void main(){
    
	gl_Position = trans * vec4(aPos.x, aPos.y, aPos.z, 1.0);//在矩阵乘法中是右乘左，与显实的乘法不同
	outColor = aColor;
	textureCoord = aTextureCoord;
}

修改代码：

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;//默认是单位矩阵
	//mat4.scale(1.5);缩放
	//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);
}

旋转

平移

缩放

aaa