When a scene is compiled, Synesthesia adds a host of uniform values that make scene writing easier and more powerful.
Versions of these uniforms are commonly included in all GLSL environments.
| Uniform |
Description |
vec2 RENDERSIZE |
The width and height in pixels of the current pass (learn more about passes) |
float TIME |
The time in seconds since the scene started rendering. |
float FRAMECOUNT |
The number of frames since the scene started rendering. |
vec2 _xy |
The current position of the pixel. Equivalent to gl_FragCoord.xy. |
vec2 _uv |
The current normalized position of the pixel, with components in the range 0.0 to 1.0. Equivalent to gl_FragCoord.xy / RENDERSIZE. |
vec2 _uvc |
The current normalized position of the pixel with aspect ratio correction, such that (0,0) will be in the center of the screen. A circle drawn with these coordinates will not appear stretched. |
const float PI |
3.14159... |
These uniforms track mouse movement and action within the preview window. This allows more intuitive and complex interaction with scenes like camera control, drawing, or color picking.
| Uniform |
Description |
vec4 _mouse |
Emulates the iMouse uniform available in Shadertoy. It stores x, y, x of previous click, and y of previous click. The previous x and y values are negative if the mouse is not down. These positions are not normalized — they are integer pixel values. Learn more about iMouse here |
vec3 _click |
The state of mouse buttons in the order: left, right, middle. Each component will be 1 when that button is pressed and 0 when it is not |
vec2 _muv |
The normalized coordinates of the mouse within the preview window (0-1) |
vec2 _muvc |
The mouse's normalized coordinates with aspect ratio correction, so they can be used to draw circles (like _uvc) |
| Uniform |
Description |
int PASSINDEX |
The index of the current pass. If your shader is a one-pass shader (the default), this will always be zero. It starts at 0 and increments by one for each pass of the shader. |
sampler2D syn_FinalPass |
The previous frame rendered by the shader. Useful for creating simple visual feedback effects. |
| Uniform |
Description |
sampler2D syn_Media |
The texture of the current media selected in the media section of the control panel. NOTE: to load this texture into your scene, you should generally use the loadMedia() function or textureMedia() function |
float syn_MediaType |
Indicates the type of the current media: None = 0, Image = 1, Video = 2, Webcam = 3. You can check if media is loaded with syn_MediaType > 0.5 or the _isMediaActive() function. |