diff options
Diffstat (limited to 'client/shaders/object_shader/opengl_vertex.glsl')
| -rw-r--r-- | client/shaders/object_shader/opengl_vertex.glsl | 72 |
1 files changed, 56 insertions, 16 deletions
diff --git a/client/shaders/object_shader/opengl_vertex.glsl b/client/shaders/object_shader/opengl_vertex.glsl index 55861b0e9..6dc25f854 100644 --- a/client/shaders/object_shader/opengl_vertex.glsl +++ b/client/shaders/object_shader/opengl_vertex.glsl @@ -24,10 +24,12 @@ centroid varying vec2 varTexCoord; uniform float f_shadowfar; uniform float f_shadow_strength; uniform float f_timeofday; + uniform vec4 CameraPos; + varying float cosLight; - varying float normalOffsetScale; varying float adj_shadow_strength; varying float f_normal_length; + varying vec3 shadow_position; #endif varying vec3 eyeVec; @@ -39,8 +41,36 @@ const float e = 2.718281828459; const float BS = 10.0; uniform float xyPerspectiveBias0; uniform float xyPerspectiveBias1; +uniform float zPerspectiveBias; #ifdef ENABLE_DYNAMIC_SHADOWS + +vec4 getRelativePosition(in vec4 position) +{ + vec2 l = position.xy - CameraPos.xy; + vec2 s = l / abs(l); + s = (1.0 - s * CameraPos.xy); + l /= s; + return vec4(l, s); +} + +float getPerspectiveFactor(in vec4 relativePosition) +{ + float pDistance = length(relativePosition.xy); + float pFactor = pDistance * xyPerspectiveBias0 + xyPerspectiveBias1; + return pFactor; +} + +vec4 applyPerspectiveDistortion(in vec4 position) +{ + vec4 l = getRelativePosition(position); + float pFactor = getPerspectiveFactor(l); + l.xy /= pFactor; + position.xy = l.xy * l.zw + CameraPos.xy; + position.z *= zPerspectiveBias; + return position; +} + // custom smoothstep implementation because it's not defined in glsl1.2 // https://docs.gl/sl4/smoothstep float mtsmoothstep(in float edge0, in float edge1, in float x) @@ -107,20 +137,31 @@ void main(void) #ifdef ENABLE_DYNAMIC_SHADOWS if (f_shadow_strength > 0.0) { vec3 nNormal = normalize(vNormal); - cosLight = dot(nNormal, -v_LightDirection); - - // Calculate normal offset scale based on the texel size adjusted for - // curvature of the SM texture. This code must be change together with - // getPerspectiveFactor or any light-space transformation. - vec3 eyeToVertex = worldPosition - eyePosition + cameraOffset; - // Distance from the vertex to the player - float distanceToPlayer = length(eyeToVertex - v_LightDirection * dot(eyeToVertex, v_LightDirection)) / f_shadowfar; - // perspective factor estimation according to the - float perspectiveFactor = distanceToPlayer * xyPerspectiveBias0 + xyPerspectiveBias1; - float texelSize = f_shadowfar * perspectiveFactor * perspectiveFactor / - (f_textureresolution * xyPerspectiveBias1 - perspectiveFactor * xyPerspectiveBias0); - float slopeScale = clamp(pow(1.0 - cosLight*cosLight, 0.5), 0.0, 1.0); - normalOffsetScale = texelSize * slopeScale; + f_normal_length = length(vNormal); + + /* normalOffsetScale is in world coordinates (1/10th of a meter) + z_bias is in light space coordinates */ + float normalOffsetScale, z_bias; + float pFactor = getPerspectiveFactor(getRelativePosition(m_ShadowViewProj * mWorld * inVertexPosition)); + if (f_normal_length > 0.0) { + nNormal = normalize(vNormal); + cosLight = dot(nNormal, -v_LightDirection); + float sinLight = pow(1 - pow(cosLight, 2.0), 0.5); + normalOffsetScale = 0.1 * pFactor * pFactor * sinLight * min(f_shadowfar, 500.0) / + xyPerspectiveBias1 / f_textureresolution; + z_bias = 1e3 * sinLight / cosLight * (0.5 + f_textureresolution / 1024.0); + } + else { + nNormal = vec3(0.0); + cosLight = clamp(dot(v_LightDirection, normalize(vec3(v_LightDirection.x, 0.0, v_LightDirection.z))), 1e-2, 1.0); + float sinLight = pow(1 - pow(cosLight, 2.0), 0.5); + normalOffsetScale = 0.0; + z_bias = 3.6e3 * sinLight / cosLight; + } + z_bias *= pFactor * pFactor / f_textureresolution / f_shadowfar; + + shadow_position = applyPerspectiveDistortion(m_ShadowViewProj * mWorld * (inVertexPosition + vec4(normalOffsetScale * nNormal, 0.0))).xyz; + shadow_position.z -= z_bias; if (f_timeofday < 0.2) { adj_shadow_strength = f_shadow_strength * 0.5 * @@ -133,7 +174,6 @@ void main(void) mtsmoothstep(0.20, 0.25, f_timeofday) * (1.0 - mtsmoothstep(0.7, 0.8, f_timeofday)); } - f_normal_length = length(vNormal); } #endif } |