forked from bartvdbraak/blender
133 lines
5.1 KiB
C
133 lines
5.1 KiB
C
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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CCL_NAMESPACE_BEGIN
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ccl_device float4 film_get_pass_result(KernelGlobals *kg,
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ccl_global float *buffer,
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float sample_scale,
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int index,
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bool use_display_sample_scale)
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{
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float4 pass_result;
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int display_pass_stride = kernel_data.film.display_pass_stride;
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int display_pass_components = kernel_data.film.display_pass_components;
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if (display_pass_components == 4) {
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float4 in = *(ccl_global float4 *)(buffer + display_pass_stride +
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index * kernel_data.film.pass_stride);
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float alpha = use_display_sample_scale ?
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(kernel_data.film.use_display_pass_alpha ? in.w : 1.0f / sample_scale) :
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1.0f;
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pass_result = make_float4(in.x, in.y, in.z, alpha);
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int display_divide_pass_stride = kernel_data.film.display_divide_pass_stride;
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if (display_divide_pass_stride != -1) {
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ccl_global float4 *divide_in = (ccl_global float4 *)(buffer + display_divide_pass_stride +
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index * kernel_data.film.pass_stride);
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float3 divided = safe_divide_even_color(float4_to_float3(pass_result),
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float4_to_float3(*divide_in));
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pass_result = make_float4(divided.x, divided.y, divided.z, pass_result.w);
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}
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if (kernel_data.film.use_display_exposure) {
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float exposure = kernel_data.film.exposure;
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pass_result *= make_float4(exposure, exposure, exposure, 1.0f);
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}
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}
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else if (display_pass_components == 1) {
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ccl_global float *in = (ccl_global float *)(buffer + display_pass_stride +
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index * kernel_data.film.pass_stride);
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pass_result = make_float4(*in, *in, *in, 1.0f / sample_scale);
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}
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return pass_result;
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}
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ccl_device float4 film_map(KernelGlobals *kg, float4 rgba_in, float scale)
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{
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float4 result;
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/* conversion to srgb */
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result.x = color_linear_to_srgb(rgba_in.x * scale);
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result.y = color_linear_to_srgb(rgba_in.y * scale);
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result.z = color_linear_to_srgb(rgba_in.z * scale);
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/* clamp since alpha might be > 1.0 due to russian roulette */
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result.w = saturate(rgba_in.w * scale);
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return result;
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}
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ccl_device uchar4 film_float_to_byte(float4 color)
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{
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uchar4 result;
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/* simple float to byte conversion */
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result.x = (uchar)(saturate(color.x) * 255.0f);
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result.y = (uchar)(saturate(color.y) * 255.0f);
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result.z = (uchar)(saturate(color.z) * 255.0f);
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result.w = (uchar)(saturate(color.w) * 255.0f);
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return result;
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}
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ccl_device void kernel_film_convert_to_byte(KernelGlobals *kg,
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ccl_global uchar4 *rgba,
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ccl_global float *buffer,
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float sample_scale,
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int x,
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int y,
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int offset,
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int stride)
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{
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/* buffer offset */
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int index = offset + x + y * stride;
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bool use_display_sample_scale = (kernel_data.film.display_divide_pass_stride == -1);
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float4 rgba_in = film_get_pass_result(kg, buffer, sample_scale, index, use_display_sample_scale);
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/* map colors */
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float4 float_result = film_map(kg, rgba_in, use_display_sample_scale ? sample_scale : 1.0f);
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uchar4 uchar_result = film_float_to_byte(float_result);
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rgba += index;
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*rgba = uchar_result;
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}
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ccl_device void kernel_film_convert_to_half_float(KernelGlobals *kg,
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ccl_global uchar4 *rgba,
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ccl_global float *buffer,
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float sample_scale,
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int x,
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int y,
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int offset,
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int stride)
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{
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/* buffer offset */
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int index = offset + x + y * stride;
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bool use_display_sample_scale = (kernel_data.film.display_divide_pass_stride == -1);
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float4 rgba_in = film_get_pass_result(kg, buffer, sample_scale, index, use_display_sample_scale);
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ccl_global half *out = (ccl_global half *)rgba + index * 4;
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float4_store_half(out, rgba_in, use_display_sample_scale ? sample_scale : 1.0f);
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}
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CCL_NAMESPACE_END
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