Shader.new
Available since: Gideros 2015.06.30
Class: Shader
Description
Creates a new shader instance.
Shader.new(vertexShader,fragmentShader,flags,uniformDescriptor,attributeDescriptor)
The paths and names for the vertexShader and the fragmentShader are without extensions. Gideros will search the assets for a file with the supplied name, automatically adding the extension relevant for the target platform: .glsl for OpenGL, .cso or .hlsl for DirectX and .mtl for Metal.
The Flag Shader.FLAG_FROM_CODE can be used to let Gideros know that the string is actually Shader code, not contained within a file.
Parameters
vertexShader: (string) the path and name for the vertex shader (no extension) or code within a string
fragmentShader: (string) the path and name for the fragment shader (no extension) or code within a string
flags: (number) a set of numerical flags or 0 if none: Shader Flags
uniformDescriptor: (table) an array of uniforms/constants descriptors: Shader Uniform Descriptors
attributeDescriptor: (table) an array of attributes descriptors: Shader Attribute Descriptors
Example
A wave shader
--Shaders are in vShader.glsl and fShader.glsl files
local shaderwave=Shader.new("openglshader/vShaderWave","openglshader/fShaderWave", 0,
{
{name="g_MVPMatrix", type=Shader.CMATRIX, sys=Shader.SYS_WVP, vertex=true},
{name="g_Color", type=Shader.CFLOAT4, mult=1, sys=Shader.SYS_COLOR},
{name="g_Texture", type=Shader.CTEXTURE, mult=1, vertex=false},
{name="time", type=Shader.CFLOAT, mult=1, vertex=false}
},
{
{name="POSITION0", type=Shader.DFLOAT, mult=3, slot=0, offset=0},
{name="vColor", type=Shader.DUBYTE, mult=0, slot=1, offset=0},
{name="TEXCOORD0", type=Shader.DFLOAT, mult=2, slot=2, offset=0}
}
)
application:setBackgroundColor(0x333333)
local bitmap = Bitmap.new(Texture.new("gfx/test.png"))
local bitmap2 = Bitmap.new(Texture.new("gfx/arrow_0001.png"))
-- position
bitmap:setPosition(32*1, 32*4)
bitmap2:setPosition(32*6, 32*1)
-- shaders
bitmap:setShader(shaderwave)
bitmap2:setShader(shaderwave)
-- order
stage:addChild(bitmap)
stage:addChild(bitmap2)
-- loop
local timer = 0
stage:addEventListener(Event.ENTER_FRAME, function(e)
timer += 0.018
shaderwave:setConstant("time", Shader.CFLOAT, 1, timer)
bitmap:setX(bitmap:getX() + 1)
if bitmap:getX() > 400 then bitmap:setX(-80) end
end)
The wave vertex shader "assets/openglshader/vShaderWave.glsl"
attribute vec4 POSITION0;
attribute vec2 TEXCOORD0;
uniform mat4 g_MVPMatrix;
varying vec2 texCoord;
void main()
{
gl_Position = g_MVPMatrix * POSITION0;
texCoord = TEXCOORD0;
}
The wave fragment shader "assets/openglshader/fShaderWave.glsl"
uniform lowp sampler2D g_Texture;
uniform lowp vec4 g_Color;
uniform highp float time;
varying highp vec2 texCoord;
void main()
{
highp vec2 tc = texCoord.xy;
// highp float dist = cos(tc.x * 24.0 - time * 4.0) * 0.02;
highp float dist = cos(tc.x * 2.0 - time * 8.0) * 0.02;
highp vec2 uv = tc + dist;
gl_FragColor = g_Color * texture2D(g_Texture, uv);
}
