diff options
Diffstat (limited to 'src/light.cpp')
| -rw-r--r-- | src/light.cpp | 30 |
1 files changed, 15 insertions, 15 deletions
diff --git a/src/light.cpp b/src/light.cpp index af8666e5d..8196fedff 100644 --- a/src/light.cpp +++ b/src/light.cpp @@ -29,15 +29,16 @@ static u8 light_LUT[LIGHT_SUN + 1]; // The const ref to light_LUT is what is actually used in the code const u8 *light_decode_table = light_LUT; -struct LightingParams -{ - float a, b, c; // Lighting curve polynomial coefficients + +struct LightingParams { + float a, b, c; // Lighting curve polynomial coefficients float boost, center, sigma; // Lighting curve parametric boost - float gamma; // Lighting curve gamma correction + float gamma; // Lighting curve gamma correction }; static LightingParams params; + float decode_light_f(float x) { if (x >= 1.0f) // x is often 1.0f @@ -45,7 +46,7 @@ float decode_light_f(float x) x = std::fmax(x, 0.0f); float brightness = ((params.a * x + params.b) * x + params.c) * x; brightness += params.boost * - std::exp(-0.5f * sqr((x - params.center) / params.sigma)); + std::exp(-0.5f * sqr((x - params.center) / params.sigma)); if (brightness <= 0.0f) // May happen if parameters are extreme return 0.0f; if (brightness >= 1.0f) @@ -53,26 +54,25 @@ float decode_light_f(float x) return powf(brightness, 1.0f / params.gamma); } + // Initialize or update the light value tables using the specified gamma void set_light_table(float gamma) { - // Lighting curve bounding gradients +// Lighting curve bounding gradients const float alpha = rangelim(g_settings->getFloat("lighting_alpha"), 0.0f, 3.0f); - const float beta = rangelim(g_settings->getFloat("lighting_beta"), 0.0f, 3.0f); - // Lighting curve polynomial coefficients + const float beta = rangelim(g_settings->getFloat("lighting_beta"), 0.0f, 3.0f); +// Lighting curve polynomial coefficients params.a = alpha + beta - 2.0f; params.b = 3.0f - 2.0f * alpha - beta; params.c = alpha; - // Lighting curve parametric boost +// Lighting curve parametric boost params.boost = rangelim(g_settings->getFloat("lighting_boost"), 0.0f, 0.4f); - params.center = rangelim( - g_settings->getFloat("lighting_boost_center"), 0.0f, 1.0f); - params.sigma = rangelim( - g_settings->getFloat("lighting_boost_spread"), 0.0f, 0.4f); - // Lighting curve gamma correction + params.center = rangelim(g_settings->getFloat("lighting_boost_center"), 0.0f, 1.0f); + params.sigma = rangelim(g_settings->getFloat("lighting_boost_spread"), 0.0f, 0.4f); +// Lighting curve gamma correction params.gamma = rangelim(gamma, 0.33f, 3.0f); - // Boundary values should be fixed +// Boundary values should be fixed light_LUT[0] = 0; light_LUT[LIGHT_SUN] = 255; |