Fix misc. typos

Found via `codespell -q 3 -S ./src/ext`

cmake/sanitize-helpers.cmake

@@ -99,7 +99,7 @@ function (sanitizer_check_compiler_flags FLAG_CANDIDATES NAME PREFIX)
 
     get_property(ENABLED_LANGUAGES GLOBAL PROPERTY ENABLED_LANGUAGES)
     foreach (LANG ${ENABLED_LANGUAGES})
-        # Sanitizer flags are not dependend on language, but the used compiler.
+        # Sanitizer flags are not dependent on language, but the used compiler.
         # So instead of searching flags foreach language, search flags foreach
         # compiler used.
         set(COMPILER ${CMAKE_${LANG}_COMPILER_ID})

src/ext/gtest/gtest.h

@@ -18672,7 +18672,7 @@ class GTEST_API_ UnitTest {
   internal::UnitTestImpl* impl() { return impl_; }
   const internal::UnitTestImpl* impl() const { return impl_; }
 
-  // These classes and funcions are friends as they need to access private
+  // These classes and functions are friends as they need to access private
   // members of UnitTest.
   friend class Test;
   friend class internal::AssertHelper;

src/pbrt/bxdfs.cpp

@@ -698,7 +698,7 @@ static std::ostream &operator<<(std::ostream &os, Tensor::Type value) {
         os << "float64_t";
         break;
     default:
-        os << "unkown";
+        os << "unknown";
         break;
     }
     return os;

src/pbrt/cmd/pbrt.cpp

@@ -218,7 +218,7 @@ int main(int argc, char *argv[]) {
     }
 
     if (options.useGPU && options.wavefront)
-        Warning("Both --gpu and --wavefront were specified; --gpu takes precidence.");
+        Warning("Both --gpu and --wavefront were specified; --gpu takes precedence.");
 
     if (options.pixelMaterial && options.wavefront) {
         Warning("Disabling --wavefront since --pixelmaterial was specified.");

src/pbrt/materials.cpp

@@ -487,7 +487,7 @@ CoatedConductorMaterial *CoatedConductorMaterial::Create(
 
 // SubsurfaceMaterial Method Definitions
 std::string SubsurfaceMaterial::ToString() const {
-    return StringPrintf("[ SubsurfaceMaterial displacment: %s scale: %f "
+    return StringPrintf("[ SubsurfaceMaterial displacement: %s scale: %f "
                         "sigma_a: %s sigma_s: %s "
                         "reflectance: %s mfp: %s uRoughness: %s vRoughness: %s "
                         "eta: %f remapRoughness: %s ]",
@@ -568,7 +568,7 @@ SubsurfaceMaterial *SubsurfaceMaterial::Create(
 
 // DiffuseTransmissionMaterial Method Definitions
 std::string DiffuseTransmissionMaterial::ToString() const {
-    return StringPrintf("[ DiffuseTransmissionMaterial displacment: %s reflectance: %s "
+    return StringPrintf("[ DiffuseTransmissionMaterial displacement: %s reflectance: %s "
                         "transmittance: %s sigma: %s ]",
                         displacement, reflectance, transmittance, sigma);
 }

src/pbrt/textures.cpp

@@ -1225,7 +1225,7 @@ GPUSpectrumImageTexture *GPUSpectrumImageTexture::Create(
                     textureCacheMutex.unlock();
                     isSingleChannel = true;
                 } else {
-                    Warning(loc, "%s: unable to decypher image format", filename);
+                    Warning(loc, "%s: unable to decipher image format", filename);
                     return nullptr;
                 }
             }  // profile scope

src/pbrt/util/image.cpp

@@ -943,7 +943,7 @@ static Imf::FrameBuffer imageToFrameBuffer(const Image &image,
     size_t xStride = image.NChannels() * TexelBytes(image.Format());
     size_t yStride = image.Resolution().x * xStride;
     // Would be nice to use PixelOffset(-dw.min.x, -dw.min.y) but
-    // it checks to make sure the coordiantes are >= 0 (which
+    // it checks to make sure the coordinates are >= 0 (which
     // usually makes sense...)
     char *originPtr = (((char *)image.RawPointer({0, 0})) - dataWindow.min.x * xStride -
                        dataWindow.min.y * yStride);
@@ -1217,7 +1217,7 @@ static ImageAndMetadata ReadPNG(const std::string &name, Allocator alloc,
         std::vector<unsigned char> buf;
         int bpp = state.info_png.color.bitdepth == 16 ? 16 : 8;
         bool hasAlpha = (state.info_png.color.colortype == LCT_RGBA);
-        // Force RGB if it's palletted or whatever.
+        // Force RGB if it's paletted or whatever.
         error =
             lodepng::decode(buf, width, height, (const unsigned char *)contents.data(),
                             contents.size(), hasAlpha ? LCT_RGBA : LCT_RGB, bpp);

src/pbrt/util/sampling_test.cpp

@@ -223,7 +223,7 @@ TEST(PiecewiseConstant1D, Continuous) {
     EXPECT_FLOAT_EQ(dist.size() * 1. / 16., pdf);
     EXPECT_EQ(0, offset);
 
-    // Right at the bounary between the 4 and the 8 segments.
+    // Right at the boundary between the 4 and the 8 segments.
     EXPECT_FLOAT_EQ(.8, dist.Sample(0.5, &pdf, &offset));
 
     // Middle of the 8 segment

src/pbrt/wavefront/media.cpp

@@ -119,7 +119,7 @@ void WavefrontPathIntegrator::SampleMediumInteraction(int wavefrontDepth) {
                         // Absorption--done.
                         PBRT_DBG("absorbed\n");
                         T_hat = SampledSpectrum(0.f);
-                        // Tell the medium to stop traveral.
+                        // Tell the medium to stop traversal.
                         return false;
                     } else if (mode == 1) {
                         // Scattering.