Sprinkle `const` around where appropriate (#1909)

* Sprinkle `const` around where appropriate

- This will make it easier to use `NDS` objects in `const` contexts (e.g. `const` parameters or methods)

* Remove the `const` qualifier on `DSi_DSP::DSPRead16`

- MMIO reads can be non-pure, so this may not be `const` in the future

1 files changed, 6 insertions, 6 deletions

diff --git a/src/DSi.cpp b/src/DSi.cpp
index ce716db..c929c6d 100644
--- a/src/DSi.cpp
+++ b/src/DSi.cpp
@@ -181,7 +181,7 @@ std::unique_ptr<NDSCart::CartCommon> DSi::EjectCart()
     return oldcart;
 }
 
-void DSi::CamInputFrame(int cam, u32* data, int width, int height, bool rgb)
+void DSi::CamInputFrame(int cam, const u32* data, int width, int height, bool rgb)
 {
     switch (cam)
     {
@@ -277,7 +277,7 @@ void DSi::SetCartInserted(bool inserted)
         SCFG_MC |= 1;
 }
 
-void DSi::DecryptModcryptArea(u32 offset, u32 size, u8* iv)
+void DSi::DecryptModcryptArea(u32 offset, u32 size, const u8* iv)
 {
     AES_ctx ctx;
     u8 key[16];
@@ -957,21 +957,21 @@ void DSi::StallNDMAs()
 }
 
 
-bool DSi::DMAsInMode(u32 cpu, u32 mode)
+bool DSi::DMAsInMode(u32 cpu, u32 mode) const
 {
     if (NDS::DMAsInMode(cpu, mode)) return true;
 
     return NDMAsInMode(cpu, NDMAModes[mode]);
 }
 
-bool DSi::DMAsRunning(u32 cpu)
+bool DSi::DMAsRunning(u32 cpu) const
 {
     if (NDS::DMAsRunning(cpu)) return true;
 
     return NDMAsRunning(cpu);
 }
 
-bool DSi::NDMAsInMode(u32 cpu, u32 mode)
+bool DSi::NDMAsInMode(u32 cpu, u32 mode) const
 {
     cpu <<= 2;
     if (NDMAs[cpu+0].IsInMode(mode)) return true;
@@ -981,7 +981,7 @@ bool DSi::NDMAsInMode(u32 cpu, u32 mode)
     return false;
 }
 
-bool DSi::NDMAsRunning(u32 cpu)
+bool DSi::NDMAsRunning(u32 cpu) const
 {
     cpu <<= 2;
     if (NDMAs[cpu+0].IsRunning()) return true;