static
bool
_IsMatrixIdentity(const GfMatrix4d& matrix)
{
const GfMatrix4d IDENTITY(1.0);
const double TOLERANCE = 1e-6;
if (GfIsClose(matrix.GetRow(0), IDENTITY.GetRow(0), TOLERANCE) &&
GfIsClose(matrix.GetRow(1), IDENTITY.GetRow(1), TOLERANCE) &&
GfIsClose(matrix.GetRow(2), IDENTITY.GetRow(2), TOLERANCE) &&
GfIsClose(matrix.GetRow(3), IDENTITY.GetRow(3), TOLERANCE)) {
return true;
}
return false;
}
void
GlfSimpleLightingContext::BindUniformBlocks(GlfBindingMapPtr const &bindingMap)
{
if (not _lightingUniformBlock)
_lightingUniformBlock = GlfUniformBlock::New();
if (not _shadowUniformBlock)
_shadowUniformBlock = GlfUniformBlock::New();
if (not _materialUniformBlock)
_materialUniformBlock = GlfUniformBlock::New();
bool shadowExists = false;
if ((not _lightingUniformBlockValid or
not _shadowUniformBlockValid) and _lights.size() > 0) {
int numLights = GetNumLightsUsed();
// 16byte aligned
struct LightSource {
float position[4];
float ambient[4];
float diffuse[4];
float specular[4];
float spotDirection[4];
float spotCutoff;
float spotFalloff;
float padding[2];
float attenuation[4];
bool hasShadow;
int32_t shadowIndex;
int32_t padding2[2];
};
struct Lighting {
int32_t useLighting;
int32_t useColorMaterialDiffuse;
int32_t padding[2];
LightSource lightSource[0];
};
// 16byte aligned
struct ShadowMatrix {
float viewToShadowMatrix[16];
float basis0[4];
float basis1[4];
float basis2[4];
float bias;
float padding[3];
};
struct Shadow {
ShadowMatrix shadow[0];
};
size_t lightingSize = sizeof(Lighting) + sizeof(LightSource) * numLights;
size_t shadowSize = sizeof(ShadowMatrix) * numLights;
Lighting *lightingData = (Lighting *)alloca(lightingSize);
Shadow *shadowData = (Shadow *)alloca(shadowSize);
memset(shadowData, 0, shadowSize);
memset(lightingData, 0, lightingSize);
GfMatrix4d viewToWorldMatrix = _worldToViewMatrix.GetInverse();
lightingData->useLighting = _useLighting;
lightingData->useColorMaterialDiffuse = _useColorMaterialDiffuse;
for (int i = 0; _useLighting and i < numLights; ++i) {
GlfSimpleLight const &light = _lights[i];
setVec4(lightingData->lightSource[i].position,
light.GetPosition() * _worldToViewMatrix);
setVec4(lightingData->lightSource[i].diffuse, light.GetDiffuse());
setVec4(lightingData->lightSource[i].ambient, light.GetAmbient());
setVec4(lightingData->lightSource[i].specular, light.GetSpecular());
setVec3(lightingData->lightSource[i].spotDirection,
_worldToViewMatrix.TransformDir(light.GetSpotDirection()));
setVec3(lightingData->lightSource[i].attenuation,
light.GetAttenuation());
lightingData->lightSource[i].spotCutoff = light.GetSpotCutoff();
lightingData->lightSource[i].spotFalloff = light.GetSpotFalloff();
lightingData->lightSource[i].hasShadow = light.HasShadow();
if (lightingData->lightSource[i].hasShadow) {
int shadowIndex = light.GetShadowIndex();
lightingData->lightSource[i].shadowIndex = shadowIndex;
GfMatrix4d viewToShadowMatrix = viewToWorldMatrix *
_shadows->GetWorldToShadowMatrix(shadowIndex);
double invBlur = 1.0/(std::max(0.0001F, light.GetShadowBlur()));
GfMatrix4d mat = viewToShadowMatrix.GetInverse();
GfVec4f xVec = GfVec4f(mat.GetRow(0) * invBlur);
GfVec4f yVec = GfVec4f(mat.GetRow(1) * invBlur);
GfVec4f zVec = GfVec4f(mat.GetRow(2));
shadowData->shadow[shadowIndex].bias = light.GetShadowBias();
setMatrix(shadowData->shadow[shadowIndex].viewToShadowMatrix,
viewToShadowMatrix);
setVec4(shadowData->shadow[shadowIndex].basis0, xVec);
setVec4(shadowData->shadow[shadowIndex].basis1, yVec);
setVec4(shadowData->shadow[shadowIndex].basis2, zVec);
shadowExists = true;
}
}
_lightingUniformBlock->Update(lightingData, lightingSize);
_lightingUniformBlockValid = true;
if (shadowExists) {
_shadowUniformBlock->Update(shadowData, shadowSize);
_shadowUniformBlockValid = true;
}
}
_lightingUniformBlock->Bind(bindingMap, _tokens->lightingUB);
if (shadowExists) {
_shadowUniformBlock->Bind(bindingMap, _tokens->shadowUB);
}
if (not _materialUniformBlockValid) {
// has to be matched with the definition of simpleLightingShader.glslfx
struct Material {
float ambient[4];
float diffuse[4];
float specular[4];
float emission[4];
float sceneColor[4]; // XXX: should be separated?
float shininess;
float padding[3];
} materialData;
memset(&materialData, 0, sizeof(materialData));
setVec4(materialData.ambient, _material.GetAmbient());
setVec4(materialData.diffuse, _material.GetDiffuse());
setVec4(materialData.specular, _material.GetSpecular());
setVec4(materialData.emission, _material.GetEmission());
materialData.shininess = _material.GetShininess();
setVec4(materialData.sceneColor, _sceneAmbient);
_materialUniformBlock->Update(&materialData, sizeof(materialData));
_materialUniformBlockValid = true;
}
_materialUniformBlock->Bind(bindingMap, _tokens->materialUB);
}