Cycles: OpenCL 3d textures support.

Note that volume rendering is not supported yet, this is a step towards that.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D2299

1 files changed, 227 insertions, 0 deletions

diff --git a/intern/cycles/kernel/kernel_image_opencl.h b/intern/cycles/kernel/kernel_image_opencl.h
new file mode 100644
index 00000000000..f6c31b28f2c
--- /dev/null
+++ b/intern/cycles/kernel/kernel_image_opencl.h
@@ -0,0 +1,227 @@
+/*
+ * Copyright 2016 Blender Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+/* For OpenCL all images are packed in a single array, and we do manual lookup
+ * and interpolation. */
+
+ccl_device_inline float4 svm_image_texture_read(KernelGlobals *kg, int id, int offset)
+{
+	/* Float4 */
+	if(id < TEX_START_BYTE4_OPENCL) {
+		return kernel_tex_fetch(__tex_image_float4_packed, offset);
+	}
+	/* Byte4 */
+	else if(id < TEX_START_FLOAT_OPENCL) {
+		uchar4 r = kernel_tex_fetch(__tex_image_byte4_packed, offset);
+		float f = 1.0f/255.0f;
+		return make_float4(r.x*f, r.y*f, r.z*f, r.w*f);
+	}
+	/* Float */
+	else if(id < TEX_START_BYTE_OPENCL) {
+		float f = kernel_tex_fetch(__tex_image_float_packed, offset);
+		return make_float4(f, f, f, 1.0f);
+	}
+	/* Byte */
+	else {
+		uchar r = kernel_tex_fetch(__tex_image_byte_packed, offset);
+		float f = r * (1.0f/255.0f);
+		return make_float4(f, f, f, 1.0f);
+	}
+}
+
+ccl_device_inline int svm_image_texture_wrap_periodic(int x, int width)
+{
+	x %= width;
+	if(x < 0)
+		x += width;
+	return x;
+}
+
+ccl_device_inline int svm_image_texture_wrap_clamp(int x, int width)
+{
+	return clamp(x, 0, width-1);
+}
+
+ccl_device_inline float svm_image_texture_frac(float x, int *ix)
+{
+	int i = float_to_int(x) - ((x < 0.0f)? 1: 0);
+	*ix = i;
+	return x - (float)i;
+}
+
+ccl_device float4 kernel_tex_image_interp(KernelGlobals *kg, int id, float x, float y)
+{
+	uint4 info = kernel_tex_fetch(__tex_image_packed_info, id*2);
+	uint width = info.x;
+	uint height = info.y;
+	uint offset = info.z;
+
+	/* Image Options */
+	uint interpolation = (info.w & (1 << 0)) ? INTERPOLATION_CLOSEST : INTERPOLATION_LINEAR;
+	uint extension;
+	if(info.w & (1 << 1))
+		extension = EXTENSION_REPEAT;
+	else if(info.w & (1 << 2))
+		extension = EXTENSION_EXTEND;
+	else
+		extension = EXTENSION_CLIP;
+
+	float4 r;
+	int ix, iy, nix, niy;
+	if(interpolation == INTERPOLATION_CLOSEST) {
+		svm_image_texture_frac(x*width, &ix);
+		svm_image_texture_frac(y*height, &iy);
+
+		if(extension == EXTENSION_REPEAT) {
+			ix = svm_image_texture_wrap_periodic(ix, width);
+			iy = svm_image_texture_wrap_periodic(iy, height);
+		}
+		else {
+			if(extension == EXTENSION_CLIP) {
+				if(x < 0.0f || y < 0.0f || x > 1.0f || y > 1.0f) {
+					return make_float4(0.0f, 0.0f, 0.0f, 0.0f);
+				}
+			}
+			/* Fall through. */
+			/* EXTENSION_EXTEND */
+			ix = svm_image_texture_wrap_clamp(ix, width);
+			iy = svm_image_texture_wrap_clamp(iy, height);
+		}
+
+		r = svm_image_texture_read(kg, id, offset + ix + iy*width);
+	}
+	else { /* INTERPOLATION_LINEAR */
+		float tx = svm_image_texture_frac(x*width - 0.5f, &ix);
+		float ty = svm_image_texture_frac(y*height - 0.5f, &iy);
+
+		if(extension == EXTENSION_REPEAT) {
+			ix = svm_image_texture_wrap_periodic(ix, width);
+			iy = svm_image_texture_wrap_periodic(iy, height);
+
+			nix = svm_image_texture_wrap_periodic(ix+1, width);
+			niy = svm_image_texture_wrap_periodic(iy+1, height);
+		}
+		else {
+			if(extension == EXTENSION_CLIP) {
+				if(x < 0.0f || y < 0.0f || x > 1.0f || y > 1.0f) {
+					return make_float4(0.0f, 0.0f, 0.0f, 0.0f);
+				}
+			}
+			nix = svm_image_texture_wrap_clamp(ix+1, width);
+			niy = svm_image_texture_wrap_clamp(iy+1, height);
+			ix = svm_image_texture_wrap_clamp(ix, width);
+			iy = svm_image_texture_wrap_clamp(iy, height);
+		}
+
+		r = (1.0f - ty)*(1.0f - tx)*svm_image_texture_read(kg, id, offset + ix + iy*width);
+		r += (1.0f - ty)*tx*svm_image_texture_read(kg, id, offset + nix + iy*width);
+		r += ty*(1.0f - tx)*svm_image_texture_read(kg, id, offset + ix + niy*width);
+		r += ty*tx*svm_image_texture_read(kg, id, offset + nix + niy*width);
+	}
+
+	return r;
+}
+
+
+ccl_device float4 kernel_tex_image_interp_3d(KernelGlobals *kg, int id, float x, float y, float z)
+{
+	uint4 info = kernel_tex_fetch(__tex_image_packed_info, id*2);
+	uint width = info.x;
+	uint height = info.y;
+	uint offset = info.z;
+	uint depth = kernel_tex_fetch(__tex_image_packed_info, id*2+1).x;
+
+	/* Image Options */
+	uint interpolation = (info.w & (1 << 0)) ? INTERPOLATION_CLOSEST : INTERPOLATION_LINEAR;
+	uint extension;
+	if(info.w & (1 << 1))
+		extension = EXTENSION_REPEAT;
+	else if(info.w & (1 << 2))
+		extension = EXTENSION_EXTEND;
+	else
+		extension = EXTENSION_CLIP;
+
+	float4 r;
+	int ix, iy, iz, nix, niy, niz;
+	if(interpolation == INTERPOLATION_CLOSEST) {
+		svm_image_texture_frac(x*width, &ix);
+		svm_image_texture_frac(y*height, &iy);
+		svm_image_texture_frac(z*depth, &iz);
+
+		if (extension == EXTENSION_REPEAT) {
+			ix = svm_image_texture_wrap_periodic(ix, width);
+			iy = svm_image_texture_wrap_periodic(iy, height);
+			iz = svm_image_texture_wrap_periodic(iz, depth);
+		}
+		else {
+			if (extension == EXTENSION_CLIP) {
+				if(x < 0.0f || y < 0.0f || z < 0.0f ||
+				   x > 1.0f || y > 1.0f || z > 1.0f)
+					return make_float4(0.0f, 0.0f, 0.0f, 0.0f);
+			}
+			/* Fall through. */
+			/* EXTENSION_EXTEND */
+			ix = svm_image_texture_wrap_clamp(ix, width);
+			iy = svm_image_texture_wrap_clamp(iy, height);
+			iz = svm_image_texture_wrap_clamp(iz, depth);
+		}
+		r = svm_image_texture_read(kg, id, offset + ix + iy*width + iz*width*height);
+	}
+	else { /* INTERPOLATION_LINEAR */
+		float tx = svm_image_texture_frac(x*(float)width - 0.5f, &ix);
+		float ty = svm_image_texture_frac(y*(float)height - 0.5f, &iy);
+		float tz = svm_image_texture_frac(z*(float)depth - 0.5f, &iz);
+
+		if(extension == EXTENSION_REPEAT) {
+			ix = svm_image_texture_wrap_periodic(ix, width);
+			iy = svm_image_texture_wrap_periodic(iy, height);
+			iz = svm_image_texture_wrap_periodic(iz, depth);
+
+			nix = svm_image_texture_wrap_periodic(ix+1, width);
+			niy = svm_image_texture_wrap_periodic(iy+1, height);
+			niz = svm_image_texture_wrap_periodic(iz+1, depth);
+		}
+		else {
+			if (extension == EXTENSION_CLIP)
+				if(x < 0.0f || y < 0.0f || z < 0.0f ||
+				   x > 1.0f || y > 1.0f || z > 1.0f)
+					return make_float4(0.0f, 0.0f, 0.0f, 0.0f);
+			/* Fall through. */
+			/*  EXTENSION_EXTEND */
+			nix = svm_image_texture_wrap_clamp(ix+1, width);
+			niy = svm_image_texture_wrap_clamp(iy+1, height);
+			niz = svm_image_texture_wrap_clamp(iz+1, depth);
+
+			ix = svm_image_texture_wrap_clamp(ix, width);
+			iy = svm_image_texture_wrap_clamp(iy, height);
+			iz = svm_image_texture_wrap_clamp(iz, depth);
+		}
+
+		r  = (1.0f - tz)*(1.0f - ty)*(1.0f - tx)*svm_image_texture_read(kg, id, offset + ix + iy*width + iz*width*height);
+		r += (1.0f - tz)*(1.0f - ty)*tx*svm_image_texture_read(kg, id, offset + nix + iy*width + iz*width*height);
+		r += (1.0f - tz)*ty*(1.0f - tx)*svm_image_texture_read(kg, id, offset + ix + niy*width + iz*width*height);
+		r += (1.0f - tz)*ty*tx*svm_image_texture_read(kg, id, offset + nix + niy*width + iz*width*height);
+
+		r += tz*(1.0f - ty)*(1.0f - tx)*svm_image_texture_read(kg, id, offset + ix + iy*width + niz*width*height);
+		r += tz*(1.0f - ty)*tx*svm_image_texture_read(kg, id, offset + nix + iy*width + niz*width*height);
+		r += tz*ty*(1.0f - tx)*svm_image_texture_read(kg, id, offset + ix + niy*width + niz*width*height);
+		r += tz*ty*tx*svm_image_texture_read(kg, id, offset + nix + niy*width + niz*width*height);
+
+	}
+
+	return r;
+}