GLuint LoadImage(std::string name, const int min, const int mag, const int wrapx, const int wrapy)
{
ILuint ImageName;
if((ImageName=ImagePrivate::DevilLoadImage(name))==0)
return 0;
unsigned int width,height,bpp;
width = ilGetInteger(IL_IMAGE_WIDTH);
height = ilGetInteger(IL_IMAGE_HEIGHT);
bpp = ilGetInteger(IL_IMAGE_BPP);
unsigned char* data=NULL;
data = new unsigned char [width*height*bpp];
memcpy(data,ilGetData(),width*height*bpp);
ilDeleteImages(1, &ImageName);
unsigned int ID=0;
glEnable(GL_TEXTURE_2D);
glGenTextures(1,&ID);
glBindTexture(GL_TEXTURE_2D, ID);
TextureFilter(min,mag);
TextureWrap(wrapx,wrapy);
switch(bpp)
{
case 3:
glTexImage2D(GL_TEXTURE_2D,0,GL_RGB,width,height,0,GL_RGB,GL_UNSIGNED_BYTE,data);
break;
case 4:
glTexImage2D(GL_TEXTURE_2D,0,GL_RGBA,width,height,0,GL_RGBA,GL_UNSIGNED_BYTE,data);
break;
default:
glTexImage2D(GL_TEXTURE_2D,0,GL_RGB,width,height,0,GL_RGB,GL_UNSIGNED_BYTE,data);
break;
}
glDisable(GL_TEXTURE_2D);
delete data;
return ID;
}
void Blur::BlurX(
const Ptr<ShaderResourceView> & src,
const Ptr<RenderTargetView> & dst,
int32_t numSamples,
float blurRadius,
const std::vector<float> & weights)
{
auto srcTex = src->GetResource()->Cast<Texture>();
auto & mipSize = srcTex->GetMipSize(src->Cast<TextureShaderResourceView>()->firstMip);
float2 texelSize = 1.0f / float2((float)mipSize.x(), (float)mipSize.y());
float offsetStep = 0.0f;
float offsetStart = 0.0f;
if (numSamples > 0)
{
offsetStep = blurRadius / (float)(numSamples - 1);
offsetStart = -blurRadius * 0.5f;
}
std::vector<float2> offsets;
for (int32_t i = 0; i < numSamples; ++i)
offsets.push_back(float2((offsetStart + (float)i * offsetStep) * texelSize.x(), 0.0f));
TextureFilter(src, dst, offsets, weights);
}
PooledRenderResourceReference<Texture> ToneMapping::BloomDownSample(const Ptr<Texture> & inTex)
{
auto texDesc = inTex->GetDesc();
texDesc.mipLevels = 1;
texDesc.width = std::max<int32_t>(1, texDesc.width / 2);
texDesc.height = std::max<int32_t>(1, texDesc.height / 2);
auto resultTexRef = TexturePool::Instance().FindFree({ TEXTURE_2D, texDesc });
float4 inTexSize = inTex->GetTexSize();
std::vector<float2> offsets;
offsets.push_back(float2(-1.0f, -1.0f) * float2(inTexSize.z(), inTexSize.w()));
offsets.push_back(float2( 1.0f, -1.0f) * float2(inTexSize.z(), inTexSize.w()));
offsets.push_back(float2(-1.0f, 1.0f) * float2(inTexSize.z(), inTexSize.w()));
offsets.push_back(float2( 1.0f, 1.0f) * float2(inTexSize.z(), inTexSize.w()));
TextureFilter(
inTex->GetShaderResourceView(),
resultTexRef->Get()->Cast<Texture>()->GetRenderTargetView(0, 0, 1),
offsets,
std::vector<float>(4, 0.25f));
return resultTexRef;
}
void ToneMapping::BloomBlur(const Ptr<Texture> & inTex, float blurRadius)
{
TextureDesc texDesc = inTex->GetDesc();
auto tmpTexRef = TexturePool::Instance().FindFree({ TEXTURE_2D, texDesc });
auto tmpTex = tmpTexRef->Get()->Cast<Texture>();
{
int32_t tableSize = (int32_t)blurRadius * 2 + 1;
auto & gaussTable = GetGaussTable(tableSize);
int32_t sampleIndex = 0;
float weightSum = 0.0f;
std::vector<float2> offsets;
std::vector<float> weights;
for (; sampleIndex < tableSize - 1; sampleIndex += 2)
{
float offsetStart = (float)sampleIndex - blurRadius;
float weight0 = gaussTable[sampleIndex];
float weight1 = gaussTable[sampleIndex + 1];
weights.push_back(weight0 + weight1);
offsets.push_back(float2(1.0f, 0.0f) * (offsetStart + weight1 / weights.back()));
weightSum += weights.back();
}
weights.push_back(gaussTable.back());
offsets.push_back(float2(1.0f, 0.0f) * blurRadius);
for (auto & w : weights)
w /= weightSum;
for (auto & offset : offsets)
offset /= float2((float)inTex->GetDesc().width, (float)inTex->GetDesc().height);
TextureFilter(inTex->GetShaderResourceView(), tmpTex->GetRenderTargetView(0, 0, 1), offsets, weights, SamplerTemplate<FILTER_MIN_MAG_MIP_LINEAR>::Get());
}
{
int32_t tableSize = (int32_t)blurRadius * 2 + 1;
auto & gaussTable = GetGaussTable(tableSize);
int32_t sampleIndex = 0;
float weightSum = 0.0f;
std::vector<float2> offsets;
std::vector<float> weights;
for (; sampleIndex < tableSize - 1; sampleIndex += 2)
{
float offsetStart = (float)sampleIndex - blurRadius;
float weight0 = gaussTable[sampleIndex];
float weight1 = gaussTable[sampleIndex + 1];
weights.push_back(weight0 + weight1);
offsets.push_back(float2(0.0f, 1.0f) * (offsetStart + weight1 / weights.back()));
weightSum += weights.back();
}
weights.push_back(gaussTable.back());
offsets.push_back(float2(0.0f, 1.0f) * blurRadius);
for (auto & w : weights)
w /= weightSum;
for (auto & offset : offsets)
offset /= float2((float)inTex->GetDesc().width, (float)inTex->GetDesc().height);
TextureFilter(tmpTex->GetShaderResourceView(), inTex->GetRenderTargetView(0, 0, 1), offsets, weights, SamplerTemplate<FILTER_MIN_MAG_MIP_LINEAR>::Get());
}
}
