预定义代码

shader代码在运行前,前后会被接上我们预先设定的环境代码来支持不同的特性。

  • GLSL模式只含有前置代码。
  • shadertoy模式有前置代码和后置代码。

GLSL模式

前置代码:

pre_frag_shader_glsl.frag

#define gl_Position uv2xy(uv)
#define gl_FragCoord uv2xy(uv)
#define gl_FragColor outColor
#define INPUT_LAYER_INDEX -1
#define OUTPUT_LAYER_INDEX -2
#define AE_INPUT_LAYER -1
#define PW_TEMP_LAYER -2
out vec4 outColor;
in vec2 uv;
uniform float slider[10];
uniform float angle[10];
uniform bool checkbox[10];
uniform vec2 point[10];
uniform vec3 point3d[10];
uniform vec4 color[10];
uniform sampler2D layer[10];
uniform vec2 layerResolution[10];
uniform sampler2D inLayer;
uniform sampler2D outLayer;
uniform float time;
uniform float inpoint;
uniform float duration;
uniform float comp_time;
uniform vec4 date;
uniform float fps;
uniform float width;
uniform float height;
uniform vec2 origin;
uniform vec2 resolution;
uniform vec2 downsample;

uniform mat4 camera_matrix;
uniform vec4 camera_info; // x,y: resolution, z: distance to plane, w: distance to focus. 
uniform bool camera_perspective;

uniform sampler1D inWaveL;
uniform sampler1D inWaveR;
uniform float inWaveN;
uniform float inWaveS;
uniform sampler1D inSpecL;
uniform sampler1D inSpecR;
uniform float inSpecN;

vec4 getColor(int layerId,vec2 coord)
{
if(layerId==AE_INPUT_LAYER) return texture(inLayer,coord);
if(layerId==PW_TEMP_LAYER) return texture(outLayer,coord);
else if(layerId>=0 && layerId<=9) return texture(layer[layerId],coord);
return vec4(0.0);
}

vec4 getColor(vec2 coord)
{
return texture(inLayer,coord);
}

vec2 uv2xy(vec2 myuv){
return myuv*resolution.xy;
}

vec2 xy2uv(vec2 myxy){
return myxy/resolution.xy;
}

shadertoy 代码

前置代码

pre_frag_shader_shadertoy.frag


#define gl_Position (_PixelsWorld_uv * iResolution.xy)
#define gl_FragCoord (_PixelsWorld_uv * iResolution.xy)
#define gl_FragColor _PixelsWorld_outColor
uniform vec3 iResolution;
uniform float iTime;
uniform float iTimeDelta;
uniform int iFrame;
// uniform float iChannelTime[4];
uniform vec4 iMouse;
uniform vec4 iDate;
uniform sampler2D iChannel0;
uniform sampler2D iChannel1;
uniform sampler2D iChannel2;
uniform sampler2D iChannel3;
uniform vec3 iChannelResolution[4];

#define INPUT_LAYER_INDEX -1
#define OUTPUT_LAYER_INDEX -2

uniform float _PixelsWorld_slider[10];
uniform float _PixelsWorld_angle[10];
uniform bool _PixelsWorld_checkbox[10];
uniform vec2 _PixelsWorld_point[10];
uniform vec3 _PixelsWorld_point3d[10];
uniform vec4 _PixelsWorld_color[10];
uniform sampler2D _PixelsWorld_layer[10];
uniform vec2 _PixelsWorld_layerResolution[10];
uniform sampler2D _PixelsWorld_inLayer;
uniform sampler2D _PixelsWorld_outLayer;
uniform float _PixelsWorld_time;
uniform float _PixelsWorld_inpoint;
uniform float _PixelsWorld_duration;
uniform float _PixelsWorld_comp_time;
uniform vec4 _PixelsWorld_date;
uniform float _PixelsWorld_fps;
uniform float _PixelsWorld_width;
uniform float _PixelsWorld_height;
uniform vec2 _PixelsWorld_origin;
uniform vec2 _PixelsWorld_resolution;
uniform vec2 _PixelsWorld_downsample;

uniform mat4 _PixelsWorld_camera_matrix;
uniform vec4 _PixelsWorld_camera_info;
uniform bool _PixelsWorld_camera_perspective;

uniform sampler1D _PixelsWorld_inWaveL;
uniform sampler1D _PixelsWorld_inWaveR;
uniform float _PixelsWorld_inWaveN;
uniform float _PixelsWorld_inWaveS;
uniform sampler1D _PixelsWorld_inSpecL;
uniform sampler1D _PixelsWorld_inSpecR;
uniform float _PixelsWorld_inSpecN;

in vec2 _PixelsWorld_uv;
out vec4 _PixelsWorld_outColor;

后置代码

post_frag_shader_shadertoy.frag

void main(){
    mainImage(_PixelsWorld_outColor, _PixelsWorld_uv * iResolution.xy);
}

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