Add test.

src/nvtt/tests/cubemaptest.cpp

@@ -0,0 +1,78 @@
+// Copyright NVIDIA Corporation 2007 -- Ignacio Castano <icastano@nvidia.com>
+// 
+// Permission is hereby granted, free of charge, to any person
+// obtaining a copy of this software and associated documentation
+// files (the "Software"), to deal in the Software without
+// restriction, including without limitation the rights to use,
+// copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following
+// conditions:
+// 
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+
+#include <nvcore/StrLib.h>
+#include <nvtt/nvtt.h>
+
+#include <stdlib.h> // EXIT_SUCCESS, EXIT_FAILURE
+#include <stdio.h> // printf
+
+
+int main(int argc, char *argv[])
+{
+    // Init context.
+    nvtt::Context context;
+
+    // Load cubemap.
+    nvtt::CubeSurface envmap;
+    if (!envmap.load("envmap.dds", 0)) {
+        printf("Error loading envmap.dds\n");
+        return EXIT_FAILURE;
+    }
+
+    envmap.toLinear(2.2f);
+
+
+    // Setup compression options.
+    nvtt::CompressionOptions compressionOptions;
+    compressionOptions.setFormat(nvtt::Format_RGBA);
+    compressionOptions.setPixelType(nvtt::PixelType_Float);
+    compressionOptions.setPixelFormat(16, 16, 16, 16);
+
+    // Setup output options.
+    nvtt::OutputOptions outputOptions;
+    outputOptions.setFileName("filtered_envmap.dds");
+
+
+    // Output header.
+    context.outputHeader(nvtt::TextureType_Cube, 64, 64, 1, 4, false, compressionOptions, outputOptions);
+
+    // Output filtered mipmaps.
+    for (int m = 0; m < 4; m++) {
+        int size = 64 / (1 << m);               // 64, 32, 16, 8
+        float cosine_power = float(64) / (1 << (2 * m)); // 64, 16,  4, 1
+
+        printf("filtering step: %d/4.\n", m+1);
+
+        nvtt::CubeSurface filteredEnvmap = envmap.cosinePowerFilter(size, cosine_power);
+
+        filteredEnvmap.toGamma(2.2f);
+
+        context.compress(filteredEnvmap, m, compressionOptions, outputOptions);
+    }
+
+    printf("done.\n");
+
+    return EXIT_SUCCESS;
+}
+