CommonUBOs.hpp

#pragma once
 
#include <cstdint>
#include <cstddef>
 
namespace score::gfx
{
#pragma pack(push, 1)
struct alignas(4) ProcessUBO
{
  float time{};
  float timeDelta{};
  float progress{};
  float sampleRate{};
 
  int32_t passIndex{};
  int32_t frameIndex{};
 
  float renderSize[2]{2048, 2048};
  float date[4]{0.f, 0.f, 0.f, 0.f};
 
  // Mirrors gl_NumWorkGroups for CSF compute shaders. Populated by
  // RenderedCSFNode just before dispatch so the libisf-injected
  // `#define gl_NumWorkGroups isf_process_uniforms.NUMWORKGROUPS_`
  // resolves to real dispatch counts on every backend (especially D3D
  // where SPIRV-Cross refuses to emit the built-in directly).
  // std140 packs uvec3 into a vec4 slot; the trailing word holds VIEWINDEX_.
  uint32_t numWorkgroups[3]{};
 
  // The view index a lowered MULTIVIEW shader reads instead of gl_ViewIndex
  // (ShaderCache's pass-per-view fallback): the face / layer this pass
  // renders. 0 everywhere else.
  int32_t viewIndex{};
};
 
struct ModelCameraUBO
{
  // clang-format off
  float mvp[16]{};
  float mv[16]{};
  float model[16]{
      1., 0., 0., 0.,
      0., 1., 0., 0.,
      0., 0., 1., 0.,
      0., 0., 0., 1.,
  };
  float view[16]{};
  float projection[16]{};
  // std140 mat3: three column vectors, each padded to vec4 alignment.
  // Column c lives at modelNormal[c * 4 + row]; the 4th float of each
  // column is padding. Writing 9 contiguous floats here garbles columns
  // 1 and 2 as read by the shader.
  float modelNormal[12]{};
  float fov = 90.f;
  // NB: must NOT be named `near`/`far` — those are legacy macros defined by
  // <windows.h>; naming members after them forces an #undef that then breaks
  // any Windows system header (mmeapi.h, combaseapi.h) included afterwards.
  float znear = 0.001f;  
  float zfar = 10000.f;  
  // clang-format on
};
 
static_assert(
    sizeof(ModelCameraUBO)
    == sizeof(float) * (16 + 16 + 16 + 16 + 16 + 12 + 1 + 1 + 1));
 
struct OutputUBO
{
  float clipSpaceCorrMatrix[16]{};
 
  float renderSize[2]{};
 
  // MSAA sample count of the bound output target. Mirrors
  // RenderList::samples(); shaders need it because gl_NumSamples is
  // stripped by glslang under SPIR-V. The trailing pad keeps the UBO
  // aligned to a vec4 boundary (std140-friendly).
  int32_t sampleCount{1};
  int32_t _pad0{0};
};
 
struct VideoMaterialUBO
{
  float scale[2]{1.f, 1.f};
  float textureSize[2]{1.f, 1.f};
  float field[4]{};
};
 
#pragma pack(pop)
 
static_assert(sizeof(VideoMaterialUBO) == 32);
static_assert(offsetof(VideoMaterialUBO, field) == 16);
}