diff options
Diffstat (limited to 'source/blender')
10 files changed, 475 insertions, 6 deletions
diff --git a/source/blender/compositor/realtime_compositor/algorithms/COM_algorithm_parallel_reduction.hh b/source/blender/compositor/realtime_compositor/algorithms/COM_algorithm_parallel_reduction.hh index 9d0851eff84..b094782c18e 100644 --- a/source/blender/compositor/realtime_compositor/algorithms/COM_algorithm_parallel_reduction.hh +++ b/source/blender/compositor/realtime_compositor/algorithms/COM_algorithm_parallel_reduction.hh @@ -27,6 +27,13 @@ float sum_blue(Context &context, GPUTexture *texture); * coefficients to compute the luminance. */ float sum_luminance(Context &context, GPUTexture *texture, float3 luminance_coefficients); +/* Computes the sum of the logarithm of the luminance of all pixels in the given texture, using the + * given luminance coefficients to compute the luminance. */ +float sum_log_luminance(Context &context, GPUTexture *texture, float3 luminance_coefficients); + +/* Computes the sum of the colors of all pixels in the given texture. */ +float4 sum_color(Context &context, GPUTexture *texture); + /* -------------------------------------------------------------------- * Sum Of Squared Difference Reductions. */ @@ -55,4 +62,20 @@ float sum_luminance_squared_difference(Context &context, float3 luminance_coefficients, float subtrahend); +/* -------------------------------------------------------------------- + * Maximum Reductions. + */ + +/* Computes the maximum luminance of all pixels in the given texture, using the given luminance + * coefficients to compute the luminance. */ +float maximum_luminance(Context &context, GPUTexture *texture, float3 luminance_coefficients); + +/* -------------------------------------------------------------------- + * Minimum Reductions. + */ + +/* Computes the minimum luminance of all pixels in the given texture, using the given luminance + * coefficients to compute the luminance. */ +float minimum_luminance(Context &context, GPUTexture *texture, float3 luminance_coefficients); + } // namespace blender::realtime_compositor diff --git a/source/blender/compositor/realtime_compositor/algorithms/intern/algorithm_parallel_reduction.cc b/source/blender/compositor/realtime_compositor/algorithms/intern/algorithm_parallel_reduction.cc index 3266ccd14eb..139c58bc190 100644 --- a/source/blender/compositor/realtime_compositor/algorithms/intern/algorithm_parallel_reduction.cc +++ b/source/blender/compositor/realtime_compositor/algorithms/intern/algorithm_parallel_reduction.cc @@ -134,6 +134,34 @@ float sum_luminance(Context &context, GPUTexture *texture, float3 luminance_coef return sum; } +float sum_log_luminance(Context &context, GPUTexture *texture, float3 luminance_coefficients) +{ + GPUShader *shader = context.shader_manager().get("compositor_sum_log_luminance"); + GPU_shader_bind(shader); + + GPU_shader_uniform_3fv(shader, "luminance_coefficients", luminance_coefficients); + + float *reduced_value = parallel_reduction_dispatch(context, texture, shader, GPU_R32F); + const float sum = *reduced_value; + MEM_freeN(reduced_value); + GPU_shader_unbind(); + + return sum; +} + +float4 sum_color(Context &context, GPUTexture *texture) +{ + GPUShader *shader = context.shader_manager().get("compositor_sum_color"); + GPU_shader_bind(shader); + + float *reduced_value = parallel_reduction_dispatch(context, texture, shader, GPU_RGBA32F); + const float4 sum = float4(reduced_value); + MEM_freeN(reduced_value); + GPU_shader_unbind(); + + return sum; +} + /* -------------------------------------------------------------------- * Sum Of Squared Difference Reductions. */ @@ -202,4 +230,42 @@ float sum_luminance_squared_difference(Context &context, return sum; } +/* -------------------------------------------------------------------- + * Maximum Reductions. + */ + +float maximum_luminance(Context &context, GPUTexture *texture, float3 luminance_coefficients) +{ + GPUShader *shader = context.shader_manager().get("compositor_maximum_luminance"); + GPU_shader_bind(shader); + + GPU_shader_uniform_3fv(shader, "luminance_coefficients", luminance_coefficients); + + float *reduced_value = parallel_reduction_dispatch(context, texture, shader, GPU_R32F); + const float maximum = *reduced_value; + MEM_freeN(reduced_value); + GPU_shader_unbind(); + + return maximum; +} + +/* -------------------------------------------------------------------- + * Minimum Reductions. + */ + +float minimum_luminance(Context &context, GPUTexture *texture, float3 luminance_coefficients) +{ + GPUShader *shader = context.shader_manager().get("compositor_minimum_luminance"); + GPU_shader_bind(shader); + + GPU_shader_uniform_3fv(shader, "luminance_coefficients", luminance_coefficients); + + float *reduced_value = parallel_reduction_dispatch(context, texture, shader, GPU_R32F); + const float minimum = *reduced_value; + MEM_freeN(reduced_value); + GPU_shader_unbind(); + + return minimum; +} + } // namespace blender::realtime_compositor diff --git a/source/blender/gpu/CMakeLists.txt b/source/blender/gpu/CMakeLists.txt index 5a1e0cde1d8..56031b2722b 100644 --- a/source/blender/gpu/CMakeLists.txt +++ b/source/blender/gpu/CMakeLists.txt @@ -357,6 +357,8 @@ set(GLSL_SRC shaders/compositor/compositor_split_viewer.glsl shaders/compositor/compositor_symmetric_blur.glsl shaders/compositor/compositor_symmetric_separable_blur.glsl + shaders/compositor/compositor_tone_map_photoreceptor.glsl + shaders/compositor/compositor_tone_map_simple.glsl shaders/compositor/library/gpu_shader_compositor_alpha_over.glsl shaders/compositor/library/gpu_shader_compositor_blur_common.glsl @@ -639,6 +641,8 @@ set(SRC_SHADER_CREATE_INFOS shaders/compositor/infos/compositor_split_viewer_info.hh shaders/compositor/infos/compositor_symmetric_blur_info.hh shaders/compositor/infos/compositor_symmetric_separable_blur_info.hh + shaders/compositor/infos/compositor_tone_map_photoreceptor_info.hh + shaders/compositor/infos/compositor_tone_map_simple_info.hh ) set(SRC_SHADER_CREATE_INFOS_MTL diff --git a/source/blender/gpu/shaders/compositor/compositor_tone_map_photoreceptor.glsl b/source/blender/gpu/shaders/compositor/compositor_tone_map_photoreceptor.glsl new file mode 100644 index 00000000000..167006585ca --- /dev/null +++ b/source/blender/gpu/shaders/compositor/compositor_tone_map_photoreceptor.glsl @@ -0,0 +1,22 @@ +#pragma BLENDER_REQUIRE(gpu_shader_compositor_texture_utilities.glsl) + +/* Tone mapping based on equation (1) and the trilinear interpolation between equations (6) and (7) + * from Reinhard, Erik, and Kate Devlin. "Dynamic range reduction inspired by photoreceptor + * physiology." IEEE transactions on visualization and computer graphics 11.1 (2005): 13-24. */ +void main() +{ + ivec2 texel = ivec2(gl_GlobalInvocationID.xy); + + vec4 input_color = texture_load(input_tx, texel); + float input_luminance = dot(input_color.rgb, luminance_coefficients); + + /* Trilinear interpolation between equations (6) and (7) from Reinhard's 2005 paper. */ + vec4 local_adaptation_level = mix(vec4(input_luminance), input_color, chromatic_adaptation); + vec4 adaptation_level = mix(global_adaptation_level, local_adaptation_level, light_adaptation); + + /* Equation (1) from Reinhard's 2005 paper, assuming Vmax is 1. */ + vec4 semi_saturation = pow(intensity * adaptation_level, vec4(contrast)); + vec4 tone_mapped_color = input_color / (input_color + semi_saturation); + + imageStore(output_img, texel, vec4(tone_mapped_color.rgb, input_color.a)); +} diff --git a/source/blender/gpu/shaders/compositor/compositor_tone_map_simple.glsl b/source/blender/gpu/shaders/compositor/compositor_tone_map_simple.glsl new file mode 100644 index 00000000000..ce42d021dd1 --- /dev/null +++ b/source/blender/gpu/shaders/compositor/compositor_tone_map_simple.glsl @@ -0,0 +1,26 @@ +#pragma BLENDER_REQUIRE(gpu_shader_compositor_texture_utilities.glsl) +#pragma BLENDER_REQUIRE(gpu_shader_common_math_utils.glsl) + +/* Tone mapping based on equation (3) from Reinhard, Erik, et al. "Photographic tone reproduction + * for digital images." Proceedings of the 29th annual conference on Computer graphics and + * interactive techniques. 2002. */ +void main() +{ + ivec2 texel = ivec2(gl_GlobalInvocationID.xy); + + vec4 input_color = texture_load(input_tx, texel); + + /* Equation (2) from Reinhard's 2002 paper. */ + vec4 scaled_color = input_color * luminance_scale; + + /* Equation (3) from Reinhard's 2002 paper, but with the 1 replaced with the blend factor for + * more flexibility. See ToneMapOperation::compute_luminance_scale_blend_factor. */ + vec4 denominator = luminance_scale_blend_factor + scaled_color; + vec4 tone_mapped_color = safe_divide(scaled_color, denominator); + + if (inverse_gamma != 0.0) { + tone_mapped_color = pow(max(tone_mapped_color, vec4(0.0)), vec4(inverse_gamma)); + } + + imageStore(output_img, texel, vec4(tone_mapped_color.rgb, input_color.a)); +} diff --git a/source/blender/gpu/shaders/compositor/infos/compositor_parallel_reduction_info.hh b/source/blender/gpu/shaders/compositor/infos/compositor_parallel_reduction_info.hh index 2e661f280af..4a71bdc80e2 100644 --- a/source/blender/gpu/shaders/compositor/infos/compositor_parallel_reduction_info.hh +++ b/source/blender/gpu/shaders/compositor/infos/compositor_parallel_reduction_info.hh @@ -12,14 +12,17 @@ GPU_SHADER_CREATE_INFO(compositor_parallel_reduction_shared) * Sum Reductions. */ -GPU_SHADER_CREATE_INFO(compositor_sum_float_shared) +GPU_SHADER_CREATE_INFO(compositor_sum_shared) .additional_info("compositor_parallel_reduction_shared") - .image(0, GPU_R32F, Qualifier::WRITE, ImageType::FLOAT_2D, "output_img") - .define("TYPE", "float") .define("IDENTITY", "vec4(0.0)") - .define("LOAD(value)", "value.x") .define("REDUCE(lhs, rhs)", "lhs + rhs"); +GPU_SHADER_CREATE_INFO(compositor_sum_float_shared) + .additional_info("compositor_sum_shared") + .image(0, GPU_R32F, Qualifier::WRITE, ImageType::FLOAT_2D, "output_img") + .define("TYPE", "float") + .define("LOAD(value)", "value.x"); + GPU_SHADER_CREATE_INFO(compositor_sum_red) .additional_info("compositor_sum_float_shared") .define("INITIALIZE(value)", "value.r") @@ -41,6 +44,20 @@ GPU_SHADER_CREATE_INFO(compositor_sum_luminance) .define("INITIALIZE(value)", "dot(value.rgb, luminance_coefficients)") .do_static_compilation(true); +GPU_SHADER_CREATE_INFO(compositor_sum_log_luminance) + .additional_info("compositor_sum_float_shared") + .push_constant(Type::VEC3, "luminance_coefficients") + .define("INITIALIZE(value)", "log(max(dot(value.rgb, luminance_coefficients), 1e-5))") + .do_static_compilation(true); + +GPU_SHADER_CREATE_INFO(compositor_sum_color) + .additional_info("compositor_sum_shared") + .image(0, GPU_RGBA32F, Qualifier::WRITE, ImageType::FLOAT_2D, "output_img") + .define("TYPE", "vec4") + .define("INITIALIZE(value)", "value") + .define("LOAD(value)", "value") + .do_static_compilation(true); + /* -------------------------------------------------------------------- * Sum Of Squared Difference Reductions. */ @@ -74,3 +91,35 @@ GPU_SHADER_CREATE_INFO(compositor_sum_luminance_squared_difference) .push_constant(Type::VEC3, "luminance_coefficients") .define("INITIALIZE(value)", "pow(dot(value.rgb, luminance_coefficients) - subtrahend, 2.0)") .do_static_compilation(true); + +/* -------------------------------------------------------------------- + * Maximum Reductions. + */ + +GPU_SHADER_CREATE_INFO(compositor_maximum_luminance) + .additional_info("compositor_parallel_reduction_shared") + .typedef_source("common_math_lib.glsl") + .image(0, GPU_R32F, Qualifier::WRITE, ImageType::FLOAT_2D, "output_img") + .push_constant(Type::VEC3, "luminance_coefficients") + .define("TYPE", "float") + .define("IDENTITY", "vec4(FLT_MIN)") + .define("INITIALIZE(value)", "dot(value.rgb, luminance_coefficients)") + .define("LOAD(value)", "value.x") + .define("REDUCE(lhs, rhs)", "max(lhs, rhs)") + .do_static_compilation(true); + +/* -------------------------------------------------------------------- + * Minimum Reductions. + */ + +GPU_SHADER_CREATE_INFO(compositor_minimum_luminance) + .additional_info("compositor_parallel_reduction_shared") + .typedef_source("common_math_lib.glsl") + .image(0, GPU_R32F, Qualifier::WRITE, ImageType::FLOAT_2D, "output_img") + .push_constant(Type::VEC3, "luminance_coefficients") + .define("TYPE", "float") + .define("IDENTITY", "vec4(FLT_MAX)") + .define("INITIALIZE(value)", "dot(value.rgb, luminance_coefficients)") + .define("LOAD(value)", "value.x") + .define("REDUCE(lhs, rhs)", "min(lhs, rhs)") + .do_static_compilation(true); diff --git a/source/blender/gpu/shaders/compositor/infos/compositor_tone_map_photoreceptor_info.hh b/source/blender/gpu/shaders/compositor/infos/compositor_tone_map_photoreceptor_info.hh new file mode 100644 index 00000000000..a460c9d58a6 --- /dev/null +++ b/source/blender/gpu/shaders/compositor/infos/compositor_tone_map_photoreceptor_info.hh @@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#include "gpu_shader_create_info.hh" + +GPU_SHADER_CREATE_INFO(compositor_tone_map_photoreceptor) + .local_group_size(16, 16) + .push_constant(Type::VEC4, "global_adaptation_level") + .push_constant(Type::FLOAT, "contrast") + .push_constant(Type::FLOAT, "intensity") + .push_constant(Type::FLOAT, "chromatic_adaptation") + .push_constant(Type::FLOAT, "light_adaptation") + .push_constant(Type::VEC3, "luminance_coefficients") + .sampler(0, ImageType::FLOAT_2D, "input_tx") + .image(0, GPU_RGBA16F, Qualifier::WRITE, ImageType::FLOAT_2D, "output_img") + .compute_source("compositor_tone_map_photoreceptor.glsl") + .do_static_compilation(true); diff --git a/source/blender/gpu/shaders/compositor/infos/compositor_tone_map_simple_info.hh b/source/blender/gpu/shaders/compositor/infos/compositor_tone_map_simple_info.hh new file mode 100644 index 00000000000..2b220af9460 --- /dev/null +++ b/source/blender/gpu/shaders/compositor/infos/compositor_tone_map_simple_info.hh @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#include "gpu_shader_create_info.hh" + +GPU_SHADER_CREATE_INFO(compositor_tone_map_simple) + .local_group_size(16, 16) + .push_constant(Type::FLOAT, "luminance_scale") + .push_constant(Type::FLOAT, "luminance_scale_blend_factor") + .push_constant(Type::FLOAT, "inverse_gamma") + .sampler(0, ImageType::FLOAT_2D, "input_tx") + .image(0, GPU_RGBA16F, Qualifier::WRITE, ImageType::FLOAT_2D, "output_img") + .compute_source("compositor_tone_map_simple.glsl") + .do_static_compilation(true); diff --git a/source/blender/makesdna/DNA_node_types.h b/source/blender/makesdna/DNA_node_types.h index 315bcbd971c..c7962db8198 100644 --- a/source/blender/makesdna/DNA_node_types.h +++ b/source/blender/makesdna/DNA_node_types.h @@ -2083,6 +2083,12 @@ typedef enum CMPNodeLevelsChannel { CMP_NODE_LEVLES_LUMINANCE_BT709 = 5, } CMPNodeLevelsChannel; +/* Tone Map Node. Stored in NodeTonemap.type. */ +typedef enum CMPNodeToneMapType { + CMP_NODE_TONE_MAP_SIMPLE = 0, + CMP_NODE_TONE_MAP_PHOTORECEPTOR = 1, +} CMPNodeToneMapType; + /* Plane track deform node. */ enum { diff --git a/source/blender/nodes/composite/nodes/node_composite_tonemap.cc b/source/blender/nodes/composite/nodes/node_composite_tonemap.cc index 2e06ad99df1..d26a01bb3c9 100644 --- a/source/blender/nodes/composite/nodes/node_composite_tonemap.cc +++ b/source/blender/nodes/composite/nodes/node_composite_tonemap.cc @@ -5,20 +5,35 @@ * \ingroup cmpnodes */ +#include <cmath> + +#include "BLI_assert.h" +#include "BLI_math_base.hh" +#include "BLI_math_vec_types.hh" +#include "BLI_math_vector.hh" + #include "RNA_access.h" #include "UI_interface.h" #include "UI_resources.h" +#include "IMB_colormanagement.h" + +#include "COM_algorithm_parallel_reduction.hh" #include "COM_node_operation.hh" +#include "COM_utilities.hh" #include "node_composite_util.hh" namespace blender::nodes::node_composite_tonemap_cc { +NODE_STORAGE_FUNCS(NodeTonemap) + static void cmp_node_tonemap_declare(NodeDeclarationBuilder &b) { - b.add_input<decl::Color>(N_("Image")).default_value({1.0f, 1.0f, 1.0f, 1.0f}); + b.add_input<decl::Color>(N_("Image")) + .default_value({1.0f, 1.0f, 1.0f, 1.0f}) + .compositor_domain_priority(0); b.add_output<decl::Color>(N_("Image")); } @@ -68,7 +83,236 @@ class ToneMapOperation : public NodeOperation { void execute() override { - get_input("Image").pass_through(get_result("Image")); + Result &input_image = get_input("Image"); + Result &output_image = get_result("Image"); + if (input_image.is_single_value()) { + input_image.pass_through(output_image); + return; + } + + switch (get_type()) { + case CMP_NODE_TONE_MAP_SIMPLE: + execute_simple(); + return; + case CMP_NODE_TONE_MAP_PHOTORECEPTOR: + execute_photoreceptor(); + return; + default: + BLI_assert_unreachable(); + return; + } + } + + /* Tone mapping based on equation (3) from Reinhard, Erik, et al. "Photographic tone reproduction + * for digital images." Proceedings of the 29th annual conference on Computer graphics and + * interactive techniques. 2002. */ + void execute_simple() + { + const float luminance_scale = compute_luminance_scale(); + const float luminance_scale_blend_factor = compute_luminance_scale_blend_factor(); + const float gamma = node_storage(bnode()).gamma; + const float inverse_gamma = gamma != 0.0f ? 1.0f / gamma : 0.0f; + + GPUShader *shader = shader_manager().get("compositor_tone_map_simple"); + GPU_shader_bind(shader); + + GPU_shader_uniform_1f(shader, "luminance_scale", luminance_scale); + GPU_shader_uniform_1f(shader, "luminance_scale_blend_factor", luminance_scale_blend_factor); + GPU_shader_uniform_1f(shader, "inverse_gamma", inverse_gamma); + + const Result &input_image = get_input("Image"); + input_image.bind_as_texture(shader, "input_tx"); + + const Domain domain = compute_domain(); + Result &output_image = get_result("Image"); + output_image.allocate_texture(domain); + output_image.bind_as_image(shader, "output_img"); + + compute_dispatch_threads_at_least(shader, domain.size); + + GPU_shader_unbind(); + output_image.unbind_as_image(); + input_image.unbind_as_texture(); + } + + /* Computes the scaling factor in equation (2) from Reinhard's 2002 paper. */ + float compute_luminance_scale() + { + const float geometric_mean = compute_geometric_mean_of_luminance(); + return geometric_mean != 0.0 ? node_storage(bnode()).key / geometric_mean : 0.0f; + } + + /* Computes equation (1) from Reinhard's 2002 paper. However, note that the equation in the paper + * is most likely wrong, and the intention is actually to compute the geometric mean through a + * logscale arithmetic mean, that is, the division should happen inside the exponential function, + * not outside of it. That's because the sum of the log luminance will be a very large negative + * number, whose exponential will almost always be zero, which is unexpected and useless. */ + float compute_geometric_mean_of_luminance() + { + return std::exp(compute_average_log_luminance()); + } + + /* Equation (3) from Reinhard's 2002 paper blends between high luminance scaling for high + * luminance values and low luminance scaling for low luminance values. This is done by adding 1 + * to the denominator, since for low luminance values, the denominator will be close to 1 and for + * high luminance values, the 1 in the denominator will be relatively insignificant. But the + * response of such function is not always ideal, so in this implementation, the 1 was exposed as + * a parameter to the user for more flexibility. */ + float compute_luminance_scale_blend_factor() + { + return node_storage(bnode()).offset; + } + + /* Tone mapping based on equation (1) and the trilinear interpolation between equations (6) and + * (7) from Reinhard, Erik, and Kate Devlin. "Dynamic range reduction inspired by photoreceptor + * physiology." IEEE transactions on visualization and computer graphics 11.1 (2005): 13-24. */ + void execute_photoreceptor() + { + const float4 global_adaptation_level = compute_global_adaptation_level(); + const float contrast = compute_contrast(); + const float intensity = compute_intensity(); + const float chromatic_adaptation = get_chromatic_adaptation(); + const float light_adaptation = get_light_adaptation(); + + GPUShader *shader = shader_manager().get("compositor_tone_map_photoreceptor"); + GPU_shader_bind(shader); + + GPU_shader_uniform_4fv(shader, "global_adaptation_level", global_adaptation_level); + GPU_shader_uniform_1f(shader, "contrast", contrast); + GPU_shader_uniform_1f(shader, "intensity", intensity); + GPU_shader_uniform_1f(shader, "chromatic_adaptation", chromatic_adaptation); + GPU_shader_uniform_1f(shader, "light_adaptation", light_adaptation); + + float luminance_coefficients[3]; + IMB_colormanagement_get_luminance_coefficients(luminance_coefficients); + GPU_shader_uniform_3fv(shader, "luminance_coefficients", luminance_coefficients); + + const Result &input_image = get_input("Image"); + input_image.bind_as_texture(shader, "input_tx"); + + const Domain domain = compute_domain(); + Result &output_image = get_result("Image"); + output_image.allocate_texture(domain); + output_image.bind_as_image(shader, "output_img"); + + compute_dispatch_threads_at_least(shader, domain.size); + + GPU_shader_unbind(); + output_image.unbind_as_image(); + input_image.unbind_as_texture(); + } + + /* Computes the global adaptation level from the trilinear interpolation equations constructed + * from equations (6) and (7) in Reinhard's 2005 paper. */ + float4 compute_global_adaptation_level() + { + const float4 average_color = compute_average_color(); + const float average_luminance = compute_average_luminance(); + const float chromatic_adaptation = get_chromatic_adaptation(); + return math::interpolate(float4(average_luminance), average_color, chromatic_adaptation); + } + + float4 compute_average_color() + { + /* The average color will reduce to zero if chromatic adaptation is zero, so just return zero + * in this case to avoid needlessly computing the average. See the trilinear interpolation + * equations constructed from equations (6) and (7) in Reinhard's 2005 paper. */ + if (get_chromatic_adaptation() == 0.0f) { + return float4(0.0f); + } + + const Result &input = get_input("Image"); + return sum_color(context(), input.texture()) / (input.domain().size.x * input.domain().size.y); + } + + float compute_average_luminance() + { + /* The average luminance will reduce to zero if chromatic adaptation is one, so just return + * zero in this case to avoid needlessly computing the average. See the trilinear interpolation + * equations constructed from equations (6) and (7) in Reinhard's 2005 paper. */ + if (get_chromatic_adaptation() == 1.0f) { + return 0.0f; + } + + float luminance_coefficients[3]; + IMB_colormanagement_get_luminance_coefficients(luminance_coefficients); + const Result &input = get_input("Image"); + float sum = sum_luminance(context(), input.texture(), luminance_coefficients); + return sum / (input.domain().size.x * input.domain().size.y); + } + + /* Computes equation (5) from Reinhard's 2005 paper. */ + float compute_intensity() + { + return std::exp(-node_storage(bnode()).f); + } + + /* If the contrast is not zero, return it, otherwise, a zero contrast denote automatic derivation + * of the contrast value based on equations (2) and (4) from Reinhard's 2005 paper. */ + float compute_contrast() + { + if (node_storage(bnode()).m != 0.0f) { + return node_storage(bnode()).m; + } + + const float log_maximum_luminance = compute_log_maximum_luminance(); + const float log_minimum_luminance = compute_log_minimum_luminance(); + + /* This is merely to guard against zero division later. */ + if (log_maximum_luminance == log_minimum_luminance) { + return 1.0f; + } + + const float average_log_luminance = compute_average_log_luminance(); + const float dynamic_range = log_maximum_luminance - log_minimum_luminance; + const float luminance_key = (log_maximum_luminance - average_log_luminance) / (dynamic_range); + + return 0.3f + 0.7f * std::pow(luminance_key, 1.4f); + } + + float compute_average_log_luminance() + { + const Result &input_image = get_input("Image"); + + float luminance_coefficients[3]; + IMB_colormanagement_get_luminance_coefficients(luminance_coefficients); + const float sum_of_log_luminance = sum_log_luminance( + context(), input_image.texture(), luminance_coefficients); + + return sum_of_log_luminance / (input_image.domain().size.x * input_image.domain().size.y); + } + + float compute_log_maximum_luminance() + { + float luminance_coefficients[3]; + IMB_colormanagement_get_luminance_coefficients(luminance_coefficients); + const float maximum = maximum_luminance( + context(), get_input("Image").texture(), luminance_coefficients); + return std::log(math::max(maximum, 1e-5f)); + } + + float compute_log_minimum_luminance() + { + float luminance_coefficients[3]; + IMB_colormanagement_get_luminance_coefficients(luminance_coefficients); + const float minimum = minimum_luminance( + context(), get_input("Image").texture(), luminance_coefficients); + return std::log(math::max(minimum, 1e-5f)); + } + + float get_chromatic_adaptation() + { + return node_storage(bnode()).c; + } + + float get_light_adaptation() + { + return node_storage(bnode()).a; + } + + CMPNodeToneMapType get_type() + { + return static_cast<CMPNodeToneMapType>(node_storage(bnode()).type); } }; |