Hi All,
I copied a motion blur filter from starling framework and I just tried to run it, but the output texture is distorted. I don’t know why ?
// A simple vertex shader which does a 3D transformation
// for simplicity, it is used by all four shaders
var vertexShaderAssembler:AGALMiniAssembler =
new AGALMiniAssembler();
vertexShaderAssembler.assemble
(
Context3DProgramType.VERTEX,
// 4x4 matrix multiply to get camera angle
"m44 op, va0, vc0\n" +
// tell fragment shader about XYZ
"mov v0, va0\n" +
// tell fragment shader about UV
"mov v1, va1\n" +
// tell fragment shader about RGBA
"mov v2, va2\n"
);
var step:String =
"add ft0.xy, ft0.xy, fc0.xy \n"+
"tex ft2, ft0.xy, fs0<2d, clamp, linear, nomip> \n" +
"add ft1, ft1, ft2 \n"
var fragmentProgramCode:String =
"mov ft0.xy, v0.xy \n" +
"tex ft1, ft0.xy, fs0<2d, clamp, linear, nomip> \n"
var numSteps:int = mSteps - 1;
for (var i:int = 0; i < numSteps; i++)
{
fragmentProgramCode += step;
}
fragmentProgramCode += "div oc, ft1, fc0.zzz\n"
// textured using UV coordinates
var fragmentShaderAssembler1:AGALMiniAssembler
= new AGALMiniAssembler();
fragmentShaderAssembler1.assemble
(
Context3DProgramType.FRAGMENT,
fragmentProgramCode
);
// combine shaders into a program which we then upload to the GPU
shaderProgram1 = context3D.createProgram();
shaderProgram1.upload(
vertexShaderAssembler.agalcode,
fragmentShaderAssembler1.agalcode);
In each frame
var tSize:Number = (512+512) * .50;
mVars[0] = mAmount * Math.cos(mAngle) / tSize;
mVars[1] = mAmount * Math.sin(mAngle) / tSize;
mVars[2] = 4;
context3D.setProgramConstantsFromVector(Context3DProgramType.FRAGMENT, 0, mVars, 1);
context3D.setTextureAt(0, myTexture);
context3D.setProgram ( shaderProgram1 );
modelmatrix.appendRotation(t*0.7, Vector3D.Y_AXIS);
modelmatrix.appendRotation(t*0.6, Vector3D.X_AXIS);
modelmatrix.appendRotation(t*1.0, Vector3D.Y_AXIS);
modelmatrix.appendTranslation(-3, 3, 0);
// clear the matrix and append new angles
modelViewProjection.identity();
modelViewProjection.append(modelmatrix);
modelViewProjection.append(viewmatrix);
modelViewProjection.append(projectionmatrix);
// pass our matrix data to the shader program
context3D.setProgramConstantsFromMatrix(
Context3DProgramType.VERTEX,
0, modelViewProjection, true );
// associate the vertex data with current shader program
// position
context3D.setVertexBufferAt(0, vertexBuffer, 0,
Context3DVertexBufferFormat.FLOAT_3);
// tex coord
context3D.setVertexBufferAt(1, vertexBuffer, 3,
Context3DVertexBufferFormat.FLOAT_2);
// vertex rgba
context3D.setVertexBufferAt(2, vertexBuffer, 8,
Context3DVertexBufferFormat.FLOAT_4);
// finally draw the triangles
context3D.drawTriangles(
indexBuffer, 0, meshIndexData.length/3);
// present/flip back buffer
// now that all meshes have been drawn
context3D.present();
