Cycles: viewport render now takes scene color management settings into account,

except for curves, that's still missing from the OpenColorIO GLSL shader.

The pixels are stored in a half float texture, converterd from full float with
native GPU instructions and SIMD on the CPU, so it should be pretty quick.
Using a GLSL shader is useful for GPU render because it avoids a copy through
CPU memory.

intern/cycles/kernel/kernel_sse2.cpp

@@ -45,11 +45,16 @@ void kernel_cpu_sse2_path_trace(KernelGlobals *kg, float *buffer, unsigned int *
 		kernel_path_trace(kg, buffer, rng_state, sample, x, y, offset, stride);
 }
 
-/* Tonemapping */
+/* Film */
 
-void kernel_cpu_sse2_tonemap(KernelGlobals *kg, uchar4 *rgba, float *buffer, int sample, int x, int y, int offset, int stride)
+void kernel_cpu_sse2_convert_to_byte(KernelGlobals *kg, uchar4 *rgba, float *buffer, float sample_scale, int x, int y, int offset, int stride)
 {
-	kernel_film_tonemap(kg, rgba, buffer, sample, x, y, offset, stride);
+	kernel_film_convert_to_byte(kg, rgba, buffer, sample_scale, x, y, offset, stride);
+}
+
+void kernel_cpu_sse2_convert_to_half_float(KernelGlobals *kg, uchar4 *rgba, float *buffer, float sample_scale, int x, int y, int offset, int stride)
+{
+	kernel_film_convert_to_half_float(kg, rgba, buffer, sample_scale, x, y, offset, stride);
 }
 
 /* Shader Evaluate */