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Code Issues 154 Wiki Activity

Cast shadows of scenery lamps from the scenery, nearby vehicles and the cab in the GL 4.6 renderer

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Hirek
2026-10-16 11:32:45 +02:00
parent 06d7b9e9f0
commit 2f0a06b98e
12 changed files with 665 additions and 75 deletions
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15
shaders/light_common.glsl
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@@ -4,6 +4,8 @@ uniform sampler2DArrayShadow shadowmap;
uniform sampler2D headlightmap;
// cube shadow maps of the lamps, see gl::LOCAL_SHADOW_TEX and opengl46_local_shadows
layout(binding = LOCAL_SHADOW_TEX) uniform samplerCubeArrayShadow local_shadowmap;
// the same for the lamps of scenery models, the lights with linear 1
layout(binding = LOCAL_SHADOW_LAMPS_TEX) uniform samplerCubeArrayShadow local_shadowmap_lamps;
#include <envmapping.glsl>
#include <conversion.glsl>
@@ -234,12 +236,14 @@ vec2 calc_headlights(light_s light, vec3 fragnormal, vec3 dpdx, vec3 dpdy)
// closest distance (squared) the light of a lamp is computed for: nearer the inverse square would grow without a limit
const float LOCAL_LIGHT_MIN_DISTANCE2 = 0.01;
// one comparison with the cube shadow map at the point of the space of the map, moved towards the lamp by Bias (metres)
float local_light_shadow_tap(vec3 position, float layer, float near, float bias)
// one comparison with the cube shadow map at the point of the space of the map, moved towards the lamp by Bias (metres). the
// map is in the array of the scenery lamps when Lamps, in the one of the cab lamp otherwise
float local_light_shadow_tap(vec3 position, float layer, float near, float bias, bool lamps)
{
vec3 axes = abs(position);
float major = max(axes.x, max(axes.y, axes.z));
return texture(local_shadowmap, vec4(position, layer), near / max(major - bias, near));
float reference = near / max(major - bias, near);
return lamps ? texture(local_shadowmap_lamps, vec4(position, layer), reference) : texture(local_shadowmap, vec4(position, layer), reference);
}
// share of the light of a lamp with a cube shadow map (headlight_weights.x is its layer) which reaches the fragment, 0..1.
@@ -261,8 +265,9 @@ float local_light_shadow(light_s light, vec3 fragnormal)
float bias = texel * 1.5;
float layer = light.headlight_weights.x;
float radius = light.headlight_weights.w;
bool lamps = (light.linear > 0.5);
if (radius <= 0.0)
return local_light_shadow_tap(position, layer, light.headlight_weights.y, bias);
return local_light_shadow_tap(position, layer, light.headlight_weights.y, bias, lamps);
// a disc of samples in the plane of the surface, each compared with its own distance: points of the surface itself, which
// samples spread across the direction to the lamp would not be at grazing angles. rotated per pixel to turn the banding into noise
vec3 side = normalize(cross(normal, (abs(normal.y) < 0.99) ? vec3(0.0, 1.0, 0.0) : vec3(1.0, 0.0, 0.0)));
@@ -277,7 +282,7 @@ float local_light_shadow(light_s light, vec3 fragnormal)
for (int i = 0; i < count; i++)
{
vec2 offset = vec2(disc[i].x * rotation.x - disc[i].y * rotation.y, disc[i].x * rotation.y + disc[i].y * rotation.x) * spread;
shadow += local_light_shadow_tap(position + side * offset.x + up * offset.y, layer, light.headlight_weights.y, bias);
shadow += local_light_shadow_tap(position + side * offset.x + up * offset.y, layer, light.headlight_weights.y, bias, lamps);
}
return shadow / float(count);
}