Step 1: Understand the particular GPU you are targetting (Architecture, register and stream details). I am afraid for many of the GPUs these details may be proprietary and you may not get it. (But as you mentioned, in your case specs are available) Step 2: Add some calls in your driver that are able to … Read more
You’re right, the vertex shader is executed for each vertex. A vertex is composed by of or several attributes (positions, normals, texture coordinates etc.). On the CPU side when you create your VAO, you describe each attribute by saying “this data in this buffer will be attribute 0, the data next to it will be … Read more
I think you are mixing up an implementation detail with usage, if you will. Let’s start with a two-dimensional array, or matrix: | 1 2 3 | | 4 5 6 | | 7 8 9 | The problem is that computer memory is a one-dimensional array of bytes. To make our discussion easier, lets … Read more
glutInit() doesn’t create a GL context or make one current. You need a current GL context for glewInit() and glGetString() to work. Try this: #include <GL/glew.h> #include <GL/glut.h> #include <cstdio> int main(int argc, char **argv) { glutInit(&argc, argv); glutCreateWindow(“GLUT”); glewInit(); printf(“OpenGL version supported by this platform (%s): \n”, glGetString(GL_VERSION)); }
If I imagine that the GL_TEXTURE_2D is a picture’s frame hangging on the wall and textureId is the real picture, Actually a very good analogy 🙂 so, what GL_TEXTURE0 and glActiveTexture are? Think about a wall with multiple picture frames, the first frame being labeled GL_TEXTURE0, the second GL_TEXTURE1 and so on.
It doesn’t appear that it should be broken from the source code (v 0.9.3.4) template <typename valType> GLM_FUNC_QUALIFIER detail::tmat4x4<valType> ortho ( valType const & left, valType const & right, valType const & bottom, valType const & top, valType const & zNear, valType const & zFar ) { detail::tmat4x4<valType> Result(1); Result[0][0] = valType(2) / (right – … Read more
By default? In counter-clockwise order. Consider a triangle facing the camera: A |\ | \ | \ B—C A->B->C would be front facing (counter-clockwise order), A->C->B would be rear-facing (clockwise order). You can change which way OpenGL considers “front facing” via glFrontFace(): The projection of a polygon to window coordinates is said to have clockwise … Read more
The OP is interested on write a shader program, so its necessary to write OpenGL in Qt, right? Like in https://doc.qt.io/qt-5/qtgui-openglwindow-example.html and https://doc.qt.io/qt-5/qtopengl-hellogl2-example.htm. There is a simple shader example on https://doc.qt.io/qt-5/qopenglshaderprogram.html program.addShaderFromSourceCode(QOpenGLShader::Vertex, “attribute highp vec4 vertex;\n” “uniform highp mat4 matrix;\n” “void main(void)\n” “{\n” ” gl_Position = matrix * vertex;\n” “}”); program.addShaderFromSourceCode(QOpenGLShader::Fragment, “uniform mediump vec4 color;\n” … Read more
According to this article it seems that now RDP handles newer versions of Direct3D and OpenGL on Windows 10 and Windows Server 2016, but by default it is disabled by Group Policy. I suppose that for performance reasons, using a hardware graphics card is disabled, and RDP uses a software-emulated graphics card driver that provides … Read more
Yes! you can use the desktop window as the window passed to OpenGL- as long as you don’t try to display anything on it 😉 Just Call GetDesktopWindow and pass the result as an argument when creating new OpenGL window.