forked from Mirrorlandia_minetest/minetest
4801bdf45a
Remove use of magic constants. Apply cameraOffset Calculate distance projected on SM plane
138 lines
4.1 KiB
GLSL
138 lines
4.1 KiB
GLSL
uniform mat4 mWorld;
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uniform vec3 dayLight;
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uniform vec3 eyePosition;
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uniform float animationTimer;
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uniform vec4 emissiveColor;
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uniform vec3 cameraOffset;
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varying vec3 vNormal;
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varying vec3 vPosition;
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varying vec3 worldPosition;
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varying lowp vec4 varColor;
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#ifdef GL_ES
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varying mediump vec2 varTexCoord;
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#else
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centroid varying vec2 varTexCoord;
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#endif
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#ifdef ENABLE_DYNAMIC_SHADOWS
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// shadow uniforms
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uniform vec3 v_LightDirection;
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uniform float f_textureresolution;
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uniform mat4 m_ShadowViewProj;
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uniform float f_shadowfar;
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uniform float f_shadow_strength;
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uniform float f_timeofday;
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varying float cosLight;
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varying float normalOffsetScale;
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varying float adj_shadow_strength;
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varying float f_normal_length;
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#endif
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varying vec3 eyeVec;
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varying float nightRatio;
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// Color of the light emitted by the light sources.
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const vec3 artificialLight = vec3(1.04, 1.04, 1.04);
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varying float vIDiff;
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const float e = 2.718281828459;
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const float BS = 10.0;
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const float bias0 = 0.9;
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const float bias1 = 1.0 - bias0;
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#ifdef ENABLE_DYNAMIC_SHADOWS
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// custom smoothstep implementation because it's not defined in glsl1.2
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// https://docs.gl/sl4/smoothstep
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float mtsmoothstep(in float edge0, in float edge1, in float x)
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{
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float t = clamp((x - edge0) / (edge1 - edge0), 0.0, 1.0);
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return t * t * (3.0 - 2.0 * t);
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}
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#endif
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float directional_ambient(vec3 normal)
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{
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vec3 v = normal * normal;
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if (normal.y < 0.0)
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return dot(v, vec3(0.670820, 0.447213, 0.836660));
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return dot(v, vec3(0.670820, 1.000000, 0.836660));
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}
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void main(void)
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{
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varTexCoord = (mTexture * inTexCoord0).st;
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gl_Position = mWorldViewProj * inVertexPosition;
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vPosition = gl_Position.xyz;
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vNormal = (mWorld * vec4(inVertexNormal, 0.0)).xyz;
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worldPosition = (mWorld * inVertexPosition).xyz;
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eyeVec = -(mWorldView * inVertexPosition).xyz;
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#if (MATERIAL_TYPE == TILE_MATERIAL_PLAIN) || (MATERIAL_TYPE == TILE_MATERIAL_PLAIN_ALPHA)
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vIDiff = 1.0;
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#else
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// This is intentional comparison with zero without any margin.
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// If normal is not equal to zero exactly, then we assume it's a valid, just not normalized vector
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vIDiff = length(inVertexNormal) == 0.0
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? 1.0
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: directional_ambient(normalize(inVertexNormal));
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#endif
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#ifdef GL_ES
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vec4 color = inVertexColor.bgra;
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#else
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vec4 color = inVertexColor;
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#endif
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color *= emissiveColor;
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// The alpha gives the ratio of sunlight in the incoming light.
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nightRatio = 1.0 - color.a;
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color.rgb = color.rgb * (color.a * dayLight.rgb +
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nightRatio * artificialLight.rgb) * 2.0;
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color.a = 1.0;
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// Emphase blue a bit in darker places
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// See C++ implementation in mapblock_mesh.cpp final_color_blend()
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float brightness = (color.r + color.g + color.b) / 3.0;
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color.b += max(0.0, 0.021 - abs(0.2 * brightness - 0.021) +
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0.07 * brightness);
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varColor = clamp(color, 0.0, 1.0);
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#ifdef ENABLE_DYNAMIC_SHADOWS
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vec3 nNormal = normalize(vNormal);
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cosLight = dot(nNormal, -v_LightDirection);
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// Calculate normal offset scale based on the texel size adjusted for
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// curvature of the SM texture. This code must be change together with
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// getPerspectiveFactor or any light-space transformation.
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vec3 eyeToVertex = worldPosition - eyePosition + cameraOffset;
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// Distance from the vertex to the player
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float distanceToPlayer = length(eyeToVertex - v_LightDirection * dot(eyeToVertex, v_LightDirection)) / f_shadowfar;
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// perspective factor estimation according to the
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float perspectiveFactor = distanceToPlayer * bias0 + bias1;
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float texelSize = f_shadowfar * perspectiveFactor * perspectiveFactor /
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(f_textureresolution * bias1 - perspectiveFactor * bias0);
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float slopeScale = clamp(pow(1.0 - cosLight*cosLight, 0.5), 0.0, 1.0);
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normalOffsetScale = texelSize * slopeScale;
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if (f_timeofday < 0.2) {
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adj_shadow_strength = f_shadow_strength * 0.5 *
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(1.0 - mtsmoothstep(0.18, 0.2, f_timeofday));
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} else if (f_timeofday >= 0.8) {
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adj_shadow_strength = f_shadow_strength * 0.5 *
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mtsmoothstep(0.8, 0.83, f_timeofday);
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} else {
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adj_shadow_strength = f_shadow_strength *
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mtsmoothstep(0.20, 0.25, f_timeofday) *
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(1.0 - mtsmoothstep(0.7, 0.8, f_timeofday));
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}
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f_normal_length = length(vNormal);
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#endif
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}
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