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/*
* Copyright 2011-2013 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.
*/
CCL_NAMESPACE_BEGIN
ccl_device float4 film_get_pass_result(KernelGlobals *kg,
ccl_global float *buffer,
float sample_scale,
int index,
bool use_display_sample_scale)
{
float4 pass_result;
int display_pass_stride = kernel_data.film.display_pass_stride;
int display_pass_components = kernel_data.film.display_pass_components;
if (display_pass_components == 4) {
ccl_global float4 *in = (ccl_global float4 *)(buffer + display_pass_stride +
index * kernel_data.film.pass_stride);
float alpha = use_display_sample_scale ?
(kernel_data.film.use_display_pass_alpha ? in->w : 1.0f / sample_scale) :
1.0f;
pass_result = make_float4(in->x, in->y, in->z, alpha);
int display_divide_pass_stride = kernel_data.film.display_divide_pass_stride;
if (display_divide_pass_stride != -1) {
ccl_global float4 *divide_in = (ccl_global float4 *)(buffer + display_divide_pass_stride +
index * kernel_data.film.pass_stride);
if (divide_in->x != 0.0f) {
pass_result.x /= divide_in->x;
}
if (divide_in->y != 0.0f) {
pass_result.y /= divide_in->y;
}
if (divide_in->z != 0.0f) {
pass_result.z /= divide_in->z;
}
}
if (kernel_data.film.use_display_exposure) {
float exposure = kernel_data.film.exposure;
pass_result *= make_float4(exposure, exposure, exposure, alpha);
}
}
else if (display_pass_components == 1) {
ccl_global float *in = (ccl_global float *)(buffer + display_pass_stride +
index * kernel_data.film.pass_stride);
pass_result = make_float4(*in, *in, *in, 1.0f / sample_scale);
}
return pass_result;
}
ccl_device float4 film_map(KernelGlobals *kg, float4 rgba_in, float scale)
{
float4 result;
/* conversion to srgb */
result.x = color_linear_to_srgb(rgba_in.x);
result.y = color_linear_to_srgb(rgba_in.y);
result.z = color_linear_to_srgb(rgba_in.z);
/* clamp since alpha might be > 1.0 due to russian roulette */
result.w = saturate(rgba_in.w);
return result;
}
ccl_device uchar4 film_float_to_byte(float4 color)
{
uchar4 result;
/* simple float to byte conversion */
result.x = (uchar)(saturate(color.x) * 255.0f);
result.y = (uchar)(saturate(color.y) * 255.0f);
result.z = (uchar)(saturate(color.z) * 255.0f);
result.w = (uchar)(saturate(color.w) * 255.0f);
return result;
}
ccl_device void kernel_film_convert_to_byte(KernelGlobals *kg,
ccl_global uchar4 *rgba,
ccl_global float *buffer,
float sample_scale,
int x,
int y,
int offset,
int stride)
{
/* buffer offset */
int index = offset + x + y * stride;
bool use_display_sample_scale = (kernel_data.film.display_divide_pass_stride == -1);
float4 rgba_in = film_get_pass_result(kg, buffer, sample_scale, index, use_display_sample_scale);
rgba += index;
/* map colors */
if (use_display_sample_scale) {
float4 float_result = film_map(kg, rgba_in, sample_scale);
uchar4 byte_result = film_float_to_byte(float_result);
*rgba = byte_result;
}
else {
float4 float_result = film_map(kg, rgba_in, 1.0);
uchar4 byte_result = film_float_to_byte(float_result);
*rgba = byte_result;
}
}
ccl_device void kernel_film_convert_to_half_float(KernelGlobals *kg,
ccl_global uchar4 *rgba,
ccl_global float *buffer,
float sample_scale,
int x,
int y,
int offset,
int stride)
{
/* buffer offset */
int index = offset + x + y * stride;
bool use_display_sample_scale = (kernel_data.film.display_divide_pass_stride == -1);
float4 rgba_in = film_get_pass_result(kg, buffer, sample_scale, index, use_display_sample_scale);
ccl_global half *out = (ccl_global half *)rgba + index * 4;
if (use_display_sample_scale) {
float4_store_half(out, rgba_in, sample_scale);
}
else {
float4_store_half(out, rgba_in, 1.0f);
}
}
CCL_NAMESPACE_END
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