precomputed_sky.h

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/*
Copyright (C) 2019, NVIDIA CORPORATION. All rights reserved.
 
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
 
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
 
#ifndef  __PRECOMPUTED_SKY_H__
#define  __PRECOMPUTED_SKY_H__
 
static const uint32_t   ShadowmapSize = 2048;       // Heightmap dimension vertical and horizontal
static const uint32_t   ShadowmapHeightmapSize = 4096;      // Heightmap dimension vertical and horizontal
static const uint32_t   ShadowmapGridSize = 1024;   // Size of the polygonal grid, in squares. Squares made of two triangles
static const float      ShadowmapWorldSize = 30.0f; // World size of the grid
static const float      ShadowmapWorldElevation = 3.0f; // Heightmap world height coefficient
 
typedef enum
{
    SKY_NONE,
    SKY_EARTH,
    SKY_STROGGOS
} SkyPreset;
 
/*-----------------------------------------------------------------------------
    Structures for sky constant buffer
-----------------------------------------------------------------------------*/
 
struct AtmosphereParameters
{
    float solar_irradiance[3];
    float sun_angular_radius;
 
    float rayleigh_scattering[3];
    float bottom_radius;
 
    float mie_scattering[3];
    float top_radius;
 
    float mie_phase_function_g;
    float SqDistanceToHorizontalBoundary;
    float AtmosphereHeight;
    float reserved;
};
 
 
VkResult SkyInitializeDataGPU();
void SkyReleaseDataGPU();
void UpdateTerrainShadowMapView(vec3_t forward);
VkResult SkyLoadScatterParameters(SkyPreset preset);
 
VkDescriptorSetLayout* SkyGetDescriptorLayout();
VkDescriptorSet SkyGetDescriptorSet();
 
void RecordCommandBufferShadowmap(VkCommandBuffer cmd_buf);
 
void InitializeShadowmapResources();
void ReleaseShadowmapResources();
#endif  /*__PRECOMPUTED_SKY_H__*/