Contents
What is fragCoord?
fragCoord : is a vec2 that is between 0 > 640 on the X axis and 0 > 360 on the Y axis. iResolution : is a vec2 with an X value of 640 and a Y value of 360.
What is glViewport OpenGL?
Description. glViewport specifies the affine transformation of x and y from normalized device coordinates to window coordinates. Let (xnd,ynd) be normalized device coordinates.
What is OpenGL uniform?
A uniform is a global Shader variable declared with the “uniform” storage qualifier. These act as parameters that the user of a shader program can pass to that program. This makes them unlike shader stage inputs and outputs, which are often different for each invocation of a shader stage.
What does GL viewport do?
The WebGLRenderingContext. viewport() method of the WebGL API sets the viewport, which specifies the affine transformation of x and y from normalized device coordinates to window coordinates.
What do I need to know about glviewport?
Specify the width and height of the viewport. When a GL context is first attached to a window, width and height are set to the dimensions of that window. glViewport specifies the affine transformation of x and y from normalized device coordinates to window coordinates. Let x nd y nd be normalized device coordinates.
How are GL _ fragcoord X and Y computed?
I’ve been scanning the specifications for both OpenGL and GLSL, and I can’t find a definitive answer as to how exactly are gl_FragCoord ‘s x and y components computed, other than they are the
Is the GL _ fragcoord based off of the frame buffer?
I’ve also done additional simple tests that show that gl_FragCoord is based off of the entire frame buffer’s origin, rather than what’s specified via glViewport ().
How does the GL viewport function work in Win32?
The window coordinates ( xw , yw ) are then computed as follows: Viewport width and height are silently clamped to a range that depends on the implementation. This range is queried by calling glGet with argument GL_MAX_VIEWPORT_DIMS.