Eegeo::m44 ExampleMeshRenderable::CalcModelViewProjection(const Eegeo::dv3& ecefCameraPosition, const Eegeo::m44& viewProjection, const float environmentFlatteningScale) const
{
const Eegeo::dv3& flattenedEcefPosition = m_environmentFlattenTranslate
? Eegeo::Rendering::EnvironmentFlatteningService::GetScaledPointEcef(GetEcefPosition(), environmentFlatteningScale)
: GetEcefPosition();
const Eegeo::v3& cameraRelativeModelOrigin = (flattenedEcefPosition - ecefCameraPosition).ToSingle();
Eegeo::m44 translateRotate;
translateRotate.SetFromBasis(m_orientationEcef.GetRow(0), m_orientationEcef.GetRow(1), m_orientationEcef.GetRow(2), cameraRelativeModelOrigin);
Eegeo::m44 scale;
if (m_environmentFlattenScale)
{
scale.Scale(Eegeo::v3(1.0f, environmentFlatteningScale, 1.0f));
}
else
{
scale.Identity();
}
Eegeo::m44 orientedCameraRelativeModel;
Eegeo::m44::Mul(orientedCameraRelativeModel, translateRotate, scale);
Eegeo::m44 modelViewProjection;
Eegeo::m44::Mul(modelViewProjection, viewProjection, orientedCameraRelativeModel);
return modelViewProjection;
}
void BoundsVisualiser::Draw(const Eegeo::v3& minExtents, const Eegeo::v3& maxExtents)
{
Build(minExtents, maxExtents);
Eegeo_GL(glUseProgram(m_pShader->m_programHandle));
Eegeo::m44 mvp;
Eegeo::m44 w;
w.Identity();
Eegeo::m44::Mul(mvp, renderContext.GetViewProjectionMatrix(), w);
Eegeo_GL(glUniformMatrix4fv(m_pShader->m_mvpUniform, 1, 0, (const GLfloat*)&mvp));
Eegeo_GL(glEnableVertexAttribArray(m_pShader->m_positionSlot));
Eegeo_GL(glBindBuffer(GL_ARRAY_BUFFER, m_glVertexBuffer));
Eegeo_GL(glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_glIndexBuffer));
Eegeo_GL(glVertexAttribPointer(m_pShader->m_positionSlot, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), 0));
for(u32 j = 0; j < NumIndices; j+=3)
{
Eegeo_GL(glDrawElements(GL_LINE_LOOP, 3, GL_UNSIGNED_SHORT, (void*)(j * 2)));
}
Eegeo_GL(glBindBuffer (GL_ARRAY_BUFFER, 0));
Eegeo_GL(glBindBuffer (GL_ELEMENT_ARRAY_BUFFER, 0));
DestroyGeometry();
}