add Wavefron OBJ loader example

1 files changed, 16 insertions, 0 deletions

diff --git a/examples/hello_obj.lc b/examples/hello_obj.lc
new file mode 100644
index 0000000..e2d7caa
--- /dev/null
+++ b/examples/hello_obj.lc
@@ -0,0 +1,16 @@
+makeFrame (time :: Float)
+          (texture :: Texture)
+          (prims :: PrimitiveStream Triangle (Vec 4 Float, Vec 3 Float, Vec 3 Float))
+
+    = imageFrame (emptyDepthImage 1, emptyColorImage (V4 0 0 0.4 1))
+  `overlay`
+      prims
+    & mapPrimitives (\(p,n,uvw) -> (perspective 0.1 100 45 1 *. lookat (V3 0 0 5) (V3 0 0 0) (V3 0 1 0) *. rotMatrixX time *. rotMatrixZ time *. p, V2 uvw%x (1 - uvw%y) ))
+    & rasterizePrimitives (TriangleCtx CullBack PolygonFill NoOffset LastVertex) ((Smooth))
+    & mapFragments (\((uv)) -> ((texture2D (Sampler PointFilter MirroredRepeat texture) uv )))
+    & accumulateWith (DepthOp Less True, ColorOp NoBlending (V4 True True True True))
+
+main = renderFrame $
+   makeFrame (Uniform "time")
+             (Texture2DSlot "diffuseTexture")
+             (fetch "objects" (Attribute "position", Attribute "normal", Attribute "uvw"))