void AtmosphereSample::CreateShadowMap()
{
ReleaseShadowMap();
static const bool bIs32BitShadowMap = true;
//ShadowMap
TextureDesc ShadowMapDesc;
ShadowMapDesc.Name = "Shadow map";
ShadowMapDesc.Type = RESOURCE_DIM_TEX_2D_ARRAY;
ShadowMapDesc.Width = m_uiShadowMapResolution;
ShadowMapDesc.Height = m_uiShadowMapResolution;
ShadowMapDesc.MipLevels = 1;
ShadowMapDesc.ArraySize = m_TerrainRenderParams.m_iNumShadowCascades;
ShadowMapDesc.Format = bIs32BitShadowMap ? TEX_FORMAT_D32_FLOAT : TEX_FORMAT_D16_UNORM;
ShadowMapDesc.BindFlags = BIND_SHADER_RESOURCE | BIND_DEPTH_STENCIL;
RefCntAutoPtr<ITexture> ptex2DShadowMap;
m_pDevice->CreateTexture(ShadowMapDesc, TextureData(), &ptex2DShadowMap);
m_pShadowMapSRV = ptex2DShadowMap->GetDefaultView( TEXTURE_VIEW_SHADER_RESOURCE );
m_pShadowMapDSVs.resize(ShadowMapDesc.ArraySize);
for(Diligent::Uint32 iArrSlice=0; iArrSlice < ShadowMapDesc.ArraySize; iArrSlice++)
{
TextureViewDesc ShadowMapDSVDesc;
ShadowMapDSVDesc.Name = "Shadow map cascade DSV";
ShadowMapDSVDesc.ViewType = TEXTURE_VIEW_DEPTH_STENCIL;
ShadowMapDSVDesc.FirstArraySlice = iArrSlice;
ShadowMapDSVDesc.NumArraySlices = 1;
ptex2DShadowMap->CreateView(ShadowMapDSVDesc, &m_pShadowMapDSVs[iArrSlice]);
}
}
void MakeShadowMap(
SHADOW_MAP* shadow_map
)
{
GLsizei width, height;
width = (GLsizei)shadow_map->size[0], height = (GLsizei)shadow_map->size[1];
ReleaseShadowMap(shadow_map);
glGenFramebuffers(1, &shadow_map->frame_buffer);
glGenTextures(1, &shadow_map->color_texture);
glBindTexture(GL_TEXTURE_2D, shadow_map->color_texture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RG32F, width, height, 0, GL_RG, GL_FLOAT, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glBindTexture(GL_TEXTURE_2D, 0);
glGenRenderbuffers(1, &shadow_map->depth_buffer);
glBindRenderbuffer(GL_RENDERBUFFER, shadow_map->depth_buffer);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT32F, width, height);
glBindRenderbuffer(GL_RENDERBUFFER, 0);
glBindFramebuffer(GL_FRAMEBUFFER, shadow_map->frame_buffer);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_TEXTURE_2D, shadow_map->color_texture, 0);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, shadow_map->depth_buffer);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
