Cycles: experimental OSL ptex reading code.

This code can't actually be enabled for building and is incomplete, but it's
here because we know we want to support this at some point and there's not much
reason to have it in a separate branch if a simple #ifdef can disable it.

1 files changed, 51 insertions, 0 deletions

diff --git a/intern/cycles/kernel/osl/osl_services.cpp b/intern/cycles/kernel/osl/osl_services.cpp
index 309f5ded96d..d7d3301c0b0 100644
--- a/intern/cycles/kernel/osl/osl_services.cpp
+++ b/intern/cycles/kernel/osl/osl_services.cpp
@@ -44,6 +44,10 @@
 #include "kernel_camera.h"
 #include "kernel_shader.h"
 
+#ifdef WITH_PTEX
+#include <Ptexture.h>
+#endif
+
 CCL_NAMESPACE_BEGIN
 
 /* RenderServices implementation */
@@ -98,10 +102,18 @@ OSLRenderServices::OSLRenderServices()
 {
 	kernel_globals = NULL;
 	osl_ts = NULL;
+
+#ifdef WITH_PTEX
+	size_t maxmem = 16384 * 1024;
+	ptex_cache = PtexCache::create(0, maxmem);
+#endif
 }
 
 OSLRenderServices::~OSLRenderServices()
 {
+#ifdef WITH_PTEX
+	ptex_cache->release();
+#endif
 }
 
 void OSLRenderServices::thread_init(KernelGlobals *kernel_globals_, OSL::TextureSystem *osl_ts_)
@@ -776,6 +788,45 @@ bool OSLRenderServices::texture(ustring filename, TextureOpt &options,
 	OSL::TextureSystem *ts = osl_ts;
 	ShaderData *sd = (ShaderData *)(sg->renderstate);
 	KernelGlobals *kg = sd->osl_globals;
+
+#ifdef WITH_PTEX
+	/* todo: this is just a quick hack, only works with particular files and options */
+	if(string_endswith(filename.string(), ".ptx")) {
+		float2 uv;
+		int faceid;
+
+		if(!primitive_ptex(kg, sd, &uv, &faceid))
+			return false;
+
+		float u = uv.x;
+		float v = uv.y;
+		float dudx = 0.0f;
+		float dvdx = 0.0f;
+		float dudy = 0.0f;
+		float dvdy = 0.0f;
+
+		Ptex::String error;
+		PtexPtr<PtexTexture> r(ptex_cache->get(filename.c_str(), error));
+
+		if(!r) {
+			//std::cerr << error.c_str() << std::endl;
+			return false;
+		}
+
+		bool mipmaplerp = false;
+		float sharpness = 1.0f;
+		PtexFilter::Options opts(PtexFilter::f_bicubic, mipmaplerp, sharpness);
+		PtexPtr<PtexFilter> f(PtexFilter::getFilter(r, opts));
+
+		f->eval(result, options.firstchannel, options.nchannels, faceid, u, v, dudx, dvdx, dudy, dvdy);
+
+		for(int c = r->numChannels(); c < options.nchannels; c++)
+			result[c] = result[0];
+
+		return true;
+	}
+#endif
+
 	OSLThreadData *tdata = kg->osl_tdata;
 	OIIO::TextureSystem::Perthread *thread_info = tdata->oiio_thread_info;