PhosphorShaders::BaseUniforms Struct Reference

GPU uniform buffer layout following std140 rules (base region). More...

#include <phosphor-shaders/include/PhosphorShaders/BaseUniforms.h>

Public Attributes
float	qt_Matrix [16]
float	qt_Opacity
float	iTime
float	iTimeDelta
int	iFrame
float	iResolution [2]
int	appField0
int	appField1
float	iMouse [4]
float	iDate [4]
float	customParams [8][4]
float	customColors [16][4]
float	iChannelResolution [4][4]
int	iAudioSpectrumSize
int	iFlipBufferY
int	_pad_after_audioSpectrum [2]
float	iTextureResolution [4][4]
float	iTimeHi
int	iIsReversed
int	_pad_after_iIsReversed [2]

Detailed Description

GPU uniform buffer layout following std140 rules (base region).

This is the generic Shadertoy-compatible portion of the UBO. Consumers append application-specific data after this block via IUniformExtension.

The render node allocates sizeof(BaseUniforms) + extension->extensionSize() bytes for the UBO, writes the base region itself, and calls extension->write() for the remainder.

appField0 / appField1 escape hatch

Two consumer-defined int fields at offsets 88–95. They exist regardless of use because they fill the std140 alignment slot between iResolution (vec2) and iMouse (vec4) — removing them would break the layout.

Use them when you have a small (≤2 ints), frequently-updated piece of state that needs to live INSIDE BaseUniforms (rather than the extension region) — typically because the fragment shader reads them on every pixel and you want them on the same cache line as iResolution. For larger or differently-shaped state, implement IUniformExtension.

The library writes them via the K_APP_FIELDS UBO region (8 bytes) so frequent updates don't trigger a full scene-header re-upload. Consumers that don't use them should leave them at 0.

Member Data Documentation

_pad_after_audioSpectrum

int PhosphorShaders::BaseUniforms::_pad_after_audioSpectrum[2]

_pad_after_iIsReversed

int PhosphorShaders::BaseUniforms::_pad_after_iIsReversed[2]

appField0

int PhosphorShaders::BaseUniforms::appField0

appField1

int PhosphorShaders::BaseUniforms::appField1

customColors

float PhosphorShaders::BaseUniforms::customColors[16][4]

customParams

float PhosphorShaders::BaseUniforms::customParams[8][4]

iAudioSpectrumSize

int PhosphorShaders::BaseUniforms::iAudioSpectrumSize

iChannelResolution

float PhosphorShaders::BaseUniforms::iChannelResolution[4][4]

iDate

float PhosphorShaders::BaseUniforms::iDate[4]

iFlipBufferY

int PhosphorShaders::BaseUniforms::iFlipBufferY

iFrame

int PhosphorShaders::BaseUniforms::iFrame

iIsReversed

int PhosphorShaders::BaseUniforms::iIsReversed

iMouse

float PhosphorShaders::BaseUniforms::iMouse[4]

iResolution

float PhosphorShaders::BaseUniforms::iResolution[2]

iTextureResolution

float PhosphorShaders::BaseUniforms::iTextureResolution[4][4]

iTime

float PhosphorShaders::BaseUniforms::iTime

iTimeDelta

float PhosphorShaders::BaseUniforms::iTimeDelta

iTimeHi

float PhosphorShaders::BaseUniforms::iTimeHi

qt_Matrix

float PhosphorShaders::BaseUniforms::qt_Matrix[16]

qt_Opacity

float PhosphorShaders::BaseUniforms::qt_Opacity

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The documentation for this struct was generated from the following file:

• phosphor-shaders/include/PhosphorShaders/BaseUniforms.h