Adobe AIR: Stage3D and AGAL

Daniel Freeman

AIR Evolution• ActionScript “Next”• StageText, StageVideo, Stage3D• Native Extensions• ActionScript Workers

UbiquitousStage3D Stage3D Stage3D Stage3DOpen GL DirectX Open GL ES SwiftShaderMac Windows Mobile No GPU Support for older hardware (Intel GMA) soon

Programmable vertices indices Triangle ViewportVertex Shader Assembly Clipping transformed triangle vertices stream Fragment Frame Rasteriser Shader Buffer fragment pixel stream stream textures

winding / backface culling

depth buffering

2d -1 2d -1 +1 z= 1 z= 0 +1 -1 -1 +1 +1 World StageCoordinates Coordinates

Versatile Interpolated Registers VertexShader FragmentShader v0-v7 Vertex Fragmentshader runs shader runs once per once per vertex fragment

Low Level mov ft3, v1 sub ft0.xy, v0.xy, fc4.xx sub ft0.z, fc4.x, v2.x abs ft1.xy, ft0.xy sub ft1.xy, ft1.xy, ft0.zz mul ft2.xy, ft1.xy, ft1.xy add ft2.x, ft2.x, ft2.y sqt ft2.x, ft2.x add ft2.z, fc4.w, v2.x sub ft2.z, ft2.z, ft2.x pow ft3.w, ft2.z, fc4.z sat ft3.w, ft3.w mov oc, ft3

Registersva0-va7 Attribute Registersvc0-vc127 Constant Registersfc0-fc127 Constant Registersfs0-fs7 Sampler Registersv0-v7 Varying Registersop Output Pointoc Output Colour

Registers vt0-vt7 va0-va7 VertexShader opvc0-vc127 v0-v7 (Interpolated) fs0-fs7 ft0-ft7 FragmentShader ocfc0-fc127

Example 1 : Solid Colour GreenSquare1

protected static const VERTICES:Vector.<Number> = Vector.<Number> ([ // X, Y, Z -0.5, -0.5, 0.0, 0.5, -0.5, 0.0, 0.5, 0.5, 0.0, -0.5, 0.5, 0.0, ]); protected static const N:int = 3; protected static const INDICES:Vector.<uint> = Vector.<uint> ([ 0, 1, 2, 0, 2, 3 ]); (-0.5, -0.5, 0) 0 1 (0.5, -0.5, 0) 0 1 0 (-0.5, 0.5, 0) 3 2 2 3 2 (0.5, 0.5, 0)

_context3D.setProgramConstantsFromVector( Context3DProgramType.FRAGMENT, 0, // fc0 Vector.<Number>([ 1.0, 0.0, 0.0, 1.0]) // = Red); vertex shader mov op, va0 output point fragment shader mov oc, fc0 output colour

Example 2 : Gradient Fill GreenSquare3

protected static const VERTICES:Vector.<Number> = Vector.<Number> ([ // X, Y, Z, r, g, b -0.5, -0.5, 0.0, 0, 1, 0, 0.5, -0.5, 0.0, 1, 0, 0, 0.5, 0.5, 0.0, 1, 1, 1, -0.5, 0.5, 0.0, 0, 0, 1, ]); protected static const N:int = 6; protected static const INDICES:Vector.<uint> = Vector.<uint> ([ 0, 1, 2, 0, 2, 3 ]); (-0.5, -0.5, 0) 0 1 (0.5, -0.5, 0) 0 1 0 (-0.5, 0.5, 0) 3 2 2 3 2 (0.5, 0.5, 0)

Interpolated Registers VertexShader FragmentShader v0-v7vertex shadermov op, va0 output pointmov v0, va1 interpolate colourfragment shadermov oc, va1 output colour

Example 3 : Rotation GreenSquare4

_transform.appendRotation( 2.0, Vector3D.Z_AXIS );_context3D.setProgramConstantsFromMatrix( Context3DProgramType.VERTEX, 0, //vc0 _transform, true);vertex shaderm44 op, va0, vc0 transformfragment shadermov oc, fc0 output colour

Example 4 : Gradient Cube Flash3DExperiment5

protected static const VERTICES:Vector.<Number> = Vector.<Number> ([ // X, Y, Z, r, g, b -0.5, -0.5, 0.5, 0, 1, 0, 0.5, -0.5, 0.5, 1, 0, 0, 0.5, 0.5, 0.5, 1, 1, 1, -0.5, 0.5, 0.5, 0, 0, 1, -0.5, -0.5, -0.5, 0, 1, 0, 0.5, -0.5, -0.5, 1, 0, 0, 0.5, 0.5, -0.5, 1, 1, 1, -0.5, 0.5, -0.5, 0, 0, 1, ]); protected static const N:int = 6; protected static const INDICES:Vector.<uint> = Vector.<uint> ( [ 0, 1, 2, 0, 2, 3, 4, 6, 5, 4, 7, 6, 0, 4, 5, 0, 5, 1, 1, 5, 6, 1, 6, 2, 2, 6, 7, 2, 7, 3, 3, 7, 4, 3, 4, 0 ]);

_projectionMatrix.perspectiveFieldOfViewLH( 45.0*Math.PI/180, stage.stageWidth/stage.stageHeight, 0.1,1000.0 ); vertex shader m44 op, va0, vc0 transform mov v0, va1 interpolate fragment shader mov oc, v0 output colour

Example 5 : Texture Cube Flash3DExperiment3

protected static const VERTICES:Vector.<Number> = Vector.<Number> ([ // X, Y, Z, u, v, -1.0, -1.0, -1.0, 0, 0, 1.0, -1.0, -1.0, 0, 1, 1.0, 1.0, -1.0, 1, 1, -1.0, 1.0, -1.0, 1, 0, etc...etc.. u 0 1 0 1 VertexShader FragmentShader v Interpolated 3 2 1

_projectionMatrix.perspectiveFieldOfViewLH( 45.0*Math.PI/180, stage.stageWidth/stage.stageHeight, 0.1,1000.0 ); vertex shader m44 op, va0, vc0 transform mov v0, va1 interpolate uv fragment shader tex ft0, v0, fs0 <2d,linear,nomip> mov oc, ft0 output fragment

Example 6 : Light Source Flash3DExperiment7a Flash3DExperiment8

protected static const VERTICES:Vector.<Number> = Vector.<Number> ([ // X, Y, Z, nX, nY, nZ -1.0, -1.0, -1.0, 0, 0, -1.0, 1.0, -1.0, -1.0, 0, 0, -1.0, 1.0, 1.0, -1.0, 0, 0, -1.0, -1.0, 1.0, -1.0, 0, 0, -1.0, etc...etc... normal

_context3D.setProgramConstantsFromVector( Context3DProgramType.FRAGMENT, 0, Vector.<Number>([ 0.5, 0.5, 0.5, 1.0 ]) ); _context3D.setProgramConstantsFromVector( Context3DProgramType.FRAGMENT, 1, Vector.<Number>([ X, Y, Z, 1.0 ]) ); vertex shader m44 op, va0, vc0 transform m44 v0, va1, vc0 normal fragment shader nrm ft0.xzy, v0 normalise mov ft0.w, fc0.w dp3 ft0, ft0, fc1 dot product sat ft0, ft0 clamp mul oc, ft0, fc0 multiply colour

Example 7 : Phong Shader Flash3DExperimentA

normal interpolated normals

fc0 Half Angle Vector fc1 Ambient Colour fc2 Diffuse Colour fc3 Specular Colourvertex shaderm44 op, va0, vc0 transformm44 v0, va1, vc4 normalfragment shadernrm ft0.xyz, v0 normalise normalmov ft0.w, fc0.w set w to 1dp3 ft0.x, ft0, fc0 dot productsat ft0.x, ft0.x clamppow ft1.x, ft0.x, fc3.w dot product to powermul ft2.xyz, fc2.xyz, ft0.xxx diffuse colouradd ft2.xyz, fc1.xyz, ft2.xyz add ambient colourmul ft3.xyz, fc3.xyz, ft1.xxx specular colouradd oc, ft2.xyz, ft3.xyz combine and output

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Adobe AIR: Stage3D and AGAL

by Daniel Freeman on Jul 14, 2012

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