D4rkl1ght3r
97 lines
3.4 KiB
HLSL
97 lines
3.4 KiB
HLSL
/*
|
|
========================================================================
|
|
Copyright (c) Afzaal. All rights reserved.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND
|
|
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
|
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
|
|
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
|
|
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
|
|
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
|
|
========================================================================
|
|
|
|
GitHub : https://github.com/umar-afzaal/LumeniteFX
|
|
Discord : https://discord.gg/deXJrW2dx6
|
|
|
|
|
|
Filename : lumenite_Projections.fxh
|
|
Version : 2026.04.11
|
|
Author : Afzaal (Kaidō)
|
|
Description: Camera projection functions for Lumenite shaders.
|
|
License : AGNYA License (https://github.com/nvb-uy/AGNYA-License)
|
|
|
|
========================================================================
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "ReShade.fxh"
|
|
|
|
/*--------------.
|
|
| :: HELPERS :: |
|
|
'--------------*/
|
|
//VERTEX SHADER
|
|
struct VSOUT
|
|
{
|
|
float4 vpos : SV_Position;
|
|
float2 uv : TEXCOORD0;
|
|
float tan_half_fov_x : TEXCOORD1;
|
|
float tan_half_fov_y : TEXCOORD2;
|
|
float inv_tan_half_fov_x : TEXCOORD3;
|
|
float inv_tan_half_fov_y : TEXCOORD4;
|
|
float near_ratio : TEXCOORD5;
|
|
float diff_ratio : TEXCOORD6;
|
|
};
|
|
|
|
#define TAN_HALF_FOV_Y tan(radians(FOV * 0.5))
|
|
#define ASPECT_RATIO_X_OVER_Y ((float)BUFFER_WIDTH / (float)BUFFER_HEIGHT)
|
|
#define TAN_HALF_FOV_X TAN_HALF_FOV_Y * ASPECT_RATIO_X_OVER_Y
|
|
#define INV_TAN_HALF_FOV_X rcp(TAN_HALF_FOV_X)
|
|
#define INV_TAN_HALF_FOV_Y rcp(TAN_HALF_FOV_Y)
|
|
|
|
VSOUT VS(uint id : SV_VertexID)
|
|
{
|
|
VSOUT o;
|
|
o.uv.x = (id == 2) ? 2.0 : 0.0;
|
|
o.uv.y = (id == 1) ? 2.0 : 0.0;
|
|
o.vpos = float4(mad(o.uv.x, 2.0, -1.0), mad(o.uv.y, -2.0, 1.0), 0.0, 1.0);
|
|
o.tan_half_fov_x = TAN_HALF_FOV_X;
|
|
o.tan_half_fov_y = TAN_HALF_FOV_Y;
|
|
o.inv_tan_half_fov_x = INV_TAN_HALF_FOV_X;
|
|
o.inv_tan_half_fov_y = INV_TAN_HALF_FOV_Y;
|
|
o.near_ratio = NEAR_PLANE / RESHADE_DEPTH_LINEARIZATION_FAR_PLANE;
|
|
o.diff_ratio = 1.0 - o.near_ratio; //lerp(a,b,t) = (a+t * (b-a)), precompute (b-a) or (1.0-near_ratio) here
|
|
return o;
|
|
}
|
|
|
|
//PROJECTION FUNCTIONS
|
|
//normalized frustum
|
|
//left-handed viewspace
|
|
//normals point outwards
|
|
//Z+ goes into the screen
|
|
float3 UVToViewSpace(float2 uv, float linear_depth_vs, VSOUT ps_input)
|
|
{
|
|
float projection_scale = mad(linear_depth_vs, ps_input.diff_ratio, ps_input.near_ratio); //faster lerp: a+t * diff
|
|
float3 view_pos;
|
|
float ndc_x = mad(uv.x, 2.0, -1.0);
|
|
float ndc_y = mad(uv.y, -2.0, 1.0);
|
|
view_pos.x = ndc_x * ps_input.tan_half_fov_x * projection_scale;
|
|
view_pos.y = ndc_y * ps_input.tan_half_fov_y * projection_scale;
|
|
view_pos.z = linear_depth_vs;
|
|
return view_pos;
|
|
}
|
|
|
|
float2 ViewSpaceToUV(float3 view_pos, VSOUT ps_input)
|
|
{
|
|
float inv_projection_scale = rcp(mad(view_pos.z, ps_input.diff_ratio, ps_input.near_ratio));
|
|
float2 ndc;
|
|
ndc.x = view_pos.x * ps_input.inv_tan_half_fov_x * inv_projection_scale;
|
|
ndc.y = view_pos.y * ps_input.inv_tan_half_fov_y * inv_projection_scale;
|
|
float2 uv;
|
|
uv.x = mad(ndc.x, 0.5, 0.5);
|
|
uv.y = mad(ndc.y, -0.5, 0.5);
|
|
return uv;
|
|
}
|