Added o3djs.material.createCheckerMaterial.

It seems pretty useful for lots of samples.

Added o3djs.effect.createCheckerEffect 

to support that.

Also put pseudoRandom into math since so many
samples use it. Will consider switching samples
to use it.

Review URL: http://codereview.chromium.org/149509

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@20510 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 83 insertions, 0 deletions

diff --git a/o3d/samples/o3djs/effect.js b/o3d/samples/o3djs/effect.js
index 3031cee..2a12520 100644
--- a/o3d/samples/o3djs/effect.js
+++ b/o3d/samples/o3djs/effect.js
@@ -50,6 +50,71 @@ o3djs.require('o3djs.io');
 o3djs.effect = o3djs.effect || {};
 
 /**
+ * The name of standard 2 color checker effect.
+ * @type {string}
+ */
+o3djs.effect.TWO_COLOR_CHECKER_EFFECT_NAME = 
+    'o3djs.effect.twoColorCheckerEffect';
+
+/**
+ * An effect string for a 2 color checker effect.
+ * @type {string}
+ */
+o3djs.effect.TWO_COLOR_CHECKER_FXSTRING = '' +
+    'float4x4 worldViewProjection : WORLDVIEWPROJECTION;\n' +
+    'float4x4 worldInverseTranspose : WORLDINVERSETRANSPOSE;\n' +
+    'float4x4 world : WORLD;\n' +
+    'float4 color1;\n' +
+    'float4 color2;\n' +
+    'float checkSize;\n' +
+    'float3 lightWorldPos;\n' +
+    'float3 lightColor;\n' +
+    '\n' +
+    'struct VertexShaderInput {\n' +
+    '  float4 position : POSITION;\n' +
+    '  float4 normal : NORMAL;\n' +
+    '  float2 texcoord : TEXCOORD0;\n' +
+    '};\n' +
+    '\n' +
+    'struct PixelShaderInput {\n' +
+    '  float4 position : POSITION;\n' +
+    '  float2 texcoord : TEXCOORD0;\n' +
+    '  float3 normal : TEXCOORD1;\n' +
+    '  float3 worldPosition : TEXCOORD2;\n' +
+    '};\n' +
+    '\n' +
+    'float4 checker(float2 uv) {\n' +
+    '  float fmodResult = fmod(floor(checkSize * uv.x) + \n' +
+    '                          floor(checkSize * uv.y), 2.0);\n' +
+    '  return (fmodResult < 1) ? color1 : color2;\n' +
+    '}\n' +
+    '\n' +
+    'PixelShaderInput vertexShaderFunction(VertexShaderInput input) {\n' +
+    '  PixelShaderInput output;\n' +
+    '\n' +
+    '  output.position = mul(input.position, worldViewProjection);\n' +
+    '  output.normal = mul(input.normal, worldInverseTranspose).xyz;\n' +
+    '  output.worldPosition = mul(input.position, world).xyz;\n' +
+    '  output.texcoord = input.texcoord;\n' +
+    '  return output;\n' +
+    '}\n' +
+    '\n' +
+    'float4 pixelShaderFunction(PixelShaderInput input): COLOR {\n' +
+    '  float3 surfaceToLight = \n' +
+    '      normalize(lightWorldPos - input.worldPosition);\n' +
+    '  float3 worldNormal = normalize(input.normal);\n' +
+    '  float4 check = checker(input.texcoord);\n' +
+    '  float4 directionalIntensity = \n' +
+    '      saturate(dot(worldNormal, surfaceToLight));\n' +
+    '  float4 outColor = directionalIntensity * check;\n' +
+    '  return float4(outColor.rgb, check.a);\n' +
+    '}\n' +
+    '\n' +
+    '// #o3d VertexShaderEntryPoint vertexShaderFunction\n' +
+    '// #o3d PixelShaderEntryPoint pixelShaderFunction\n' +
+    '// #o3d MatrixLoadOrder RowMajor\n';
+
+/**
  * The name of the parameter on a material if it's a collada standard
  * material.
  *
@@ -770,3 +835,21 @@ o3djs.effect.createUniformParameters = function(pack, effect, paramObject) {
   }
 };
 
+/**
+ * Creates an effect that draws a 2 color procedural checker pattern.
+ * @param {!o3d.Pack} pack The pack to create the effect in. If the pack
+ *     already has an effect with the same name that effect will be returned.
+ * @return {!o3d.Effect} The effect.
+ */
+o3djs.effect.createCheckerEffect = function(pack) {
+  var effects = pack.getObjects(o3djs.effect.TWO_COLOR_CHECKER_EFFECT_NAME,
+                                'o3d.Effect');
+  if (effects.length > 0) {
+    return effects[0];
+  }
+
+  var effect = pack.createObject('Effect');
+  effect.loadFromFXString(o3djs.effect.TWO_COLOR_CHECKER_FXSTRING);
+  effect.name = o3djs.effect.TWO_COLOR_CHECKER_EFFECT_NAME;
+  return effect;
+};