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VideoCore: Use union to index into Regs struct

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Also remove some unused members.
This commit is contained in:
Yuri Kunde Schlesner 2017-01-28 13:58:51 -08:00
parent 2889372e47
commit 602f57da38
2 changed files with 28 additions and 46 deletions
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62
src/video_core/regs.h
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@ -45,46 +45,31 @@ namespace Pica {
#endif // _MSC_VER
struct Regs {
INSERT_PADDING_WORDS(0x10);
u32 trigger_irq;
INSERT_PADDING_WORDS(0x2f);
RasterizerRegs rasterizer;
TexturingRegs texturing;
FramebufferRegs framebuffer;
LightingRegs lighting;
PipelineRegs pipeline;
ShaderRegs gs;
ShaderRegs vs;
INSERT_PADDING_WORDS(0x20);
static constexpr size_t NUM_REGS = 0x300;
union {
struct {
INSERT_PADDING_WORDS(0x10);
u32 trigger_irq;
INSERT_PADDING_WORDS(0x2f);
RasterizerRegs rasterizer;
TexturingRegs texturing;
FramebufferRegs framebuffer;
LightingRegs lighting;
PipelineRegs pipeline;
ShaderRegs gs;
ShaderRegs vs;
INSERT_PADDING_WORDS(0x20);
};
std::array<u32, NUM_REGS> reg_array;
};
// Map register indices to names readable by humans
// Used for debugging purposes, so performance is not an issue here
static std::string GetCommandName(int index);
static constexpr size_t NumIds() {
return sizeof(Regs) / sizeof(u32);
}
const u32& operator[](int index) const {
const u32* content = reinterpret_cast<const u32*>(this);
return content[index];
}
u32& operator[](int index) {
u32* content = reinterpret_cast<u32*>(this);
return content[index];
}
private:
/*
* Most physical addresses which Pica registers refer to are 8-byte aligned.
* This function should be used to get the address from a raw register value.
*/
static inline u32 DecodeAddressRegister(u32 register_value) {
return register_value * 8;
}
};
static_assert(sizeof(Regs) == Regs::NUM_REGS * sizeof(u32), "Regs struct has wrong size");
// TODO: MSVC does not support using offsetof() on non-static data members even though this
// is technically allowed since C++11. This macro should be enabled once MSVC adds
// support for that.
@ -154,11 +139,4 @@ ASSERT_REG_POSITION(vs, 0x2b0);
#undef ASSERT_REG_POSITION
#endif // !defined(_MSC_VER)
// The total number of registers is chosen arbitrarily, but let's make sure it's not some odd value
// anyway.
static_assert(sizeof(Regs) <= 0x300 * sizeof(u32),
"Register set structure larger than it should be");
static_assert(sizeof(Regs) >= 0x300 * sizeof(u32),
"Register set structure smaller than it should be");
} // namespace Pica