18a5e888bb
It's not really known how this actually works. Some testing has shown that this probably performs no filtering, and common usage in games suggests it's not actually resizing the image at all. However, this patch does seem to fix some homebrew showing quasi-duplicated images while still keeping other applications in a working state.
266 lines
8.2 KiB
C++
266 lines
8.2 KiB
C++
// Copyright 2014 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <cstddef>
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#include "common/common_types.h"
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#include "common/bit_field.h"
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namespace GPU {
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// Returns index corresponding to the Regs member labeled by field_name
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// TODO: Due to Visual studio bug 209229, offsetof does not return constant expressions
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// when used with array elements (e.g. GPU_REG_INDEX(memory_fill_config[0])).
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// For details cf. https://connect.microsoft.com/VisualStudio/feedback/details/209229/offsetof-does-not-produce-a-constant-expression-for-array-members
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// Hopefully, this will be fixed sometime in the future.
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// For lack of better alternatives, we currently hardcode the offsets when constant
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// expressions are needed via GPU_REG_INDEX_WORKAROUND (on sane compilers, static_asserts
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// will then make sure the offsets indeed match the automatically calculated ones).
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#define GPU_REG_INDEX(field_name) (offsetof(GPU::Regs, field_name) / sizeof(u32))
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#if defined(_MSC_VER)
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#define GPU_REG_INDEX_WORKAROUND(field_name, backup_workaround_index) (backup_workaround_index)
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#else
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// NOTE: Yeah, hacking in a static_assert here just to workaround the lacking MSVC compiler
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// really is this annoying. This macro just forwards its first argument to GPU_REG_INDEX
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// and then performs a (no-op) cast to size_t iff the second argument matches the expected
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// field offset. Otherwise, the compiler will fail to compile this code.
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#define GPU_REG_INDEX_WORKAROUND(field_name, backup_workaround_index) \
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((typename std::enable_if<backup_workaround_index == GPU_REG_INDEX(field_name), size_t>::type)GPU_REG_INDEX(field_name))
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#endif
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// MMIO region 0x1EFxxxxx
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struct Regs {
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// helper macro to properly align structure members.
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// Calling INSERT_PADDING_WORDS will add a new member variable with a name like "pad121",
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// depending on the current source line to make sure variable names are unique.
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#define INSERT_PADDING_WORDS_HELPER1(x, y) x ## y
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#define INSERT_PADDING_WORDS_HELPER2(x, y) INSERT_PADDING_WORDS_HELPER1(x, y)
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#define INSERT_PADDING_WORDS(num_words) u32 INSERT_PADDING_WORDS_HELPER2(pad, __LINE__)[(num_words)]
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// helper macro to make sure the defined structures are of the expected size.
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#if defined(_MSC_VER)
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// TODO: MSVC does not support using sizeof() on non-static data members even though this
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// is technically allowed since C++11. This macro should be enabled once MSVC adds
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// support for that.
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#define ASSERT_MEMBER_SIZE(name, size_in_bytes)
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#else
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#define ASSERT_MEMBER_SIZE(name, size_in_bytes) \
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static_assert(sizeof(name) == size_in_bytes, \
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"Structure size and register block length don't match")
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#endif
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enum class PixelFormat : u32 {
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RGBA8 = 0,
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RGB8 = 1,
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RGB565 = 2,
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RGB5A1 = 3,
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RGBA4 = 4,
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};
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INSERT_PADDING_WORDS(0x4);
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struct {
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u32 address_start;
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u32 address_end; // ?
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u32 size;
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u32 value; // ?
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inline u32 GetStartAddress() const {
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return DecodeAddressRegister(address_start);
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}
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inline u32 GetEndAddress() const {
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return DecodeAddressRegister(address_end);
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}
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} memory_fill_config[2];
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ASSERT_MEMBER_SIZE(memory_fill_config[0], 0x10);
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INSERT_PADDING_WORDS(0x10b);
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struct FramebufferConfig {
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union {
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u32 size;
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BitField< 0, 16, u32> width;
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BitField<16, 16, u32> height;
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};
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INSERT_PADDING_WORDS(0x2);
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u32 address_left1;
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u32 address_left2;
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union {
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u32 format;
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BitField< 0, 3, PixelFormat> color_format;
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};
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INSERT_PADDING_WORDS(0x1);
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union {
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u32 active_fb;
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// 0: Use parameters ending with "1"
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// 1: Use parameters ending with "2"
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BitField<0, 1, u32> second_fb_active;
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};
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INSERT_PADDING_WORDS(0x5);
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// Distance between two pixel rows, in bytes
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u32 stride;
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u32 address_right1;
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u32 address_right2;
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INSERT_PADDING_WORDS(0x30);
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} framebuffer_config[2];
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ASSERT_MEMBER_SIZE(framebuffer_config[0], 0x100);
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INSERT_PADDING_WORDS(0x169);
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struct {
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u32 input_address;
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u32 output_address;
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inline u32 GetPhysicalInputAddress() const {
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return DecodeAddressRegister(input_address);
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}
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inline u32 GetPhysicalOutputAddress() const {
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return DecodeAddressRegister(output_address);
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}
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union {
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u32 output_size;
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BitField< 0, 16, u32> output_width;
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BitField<16, 16, u32> output_height;
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};
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union {
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u32 input_size;
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BitField< 0, 16, u32> input_width;
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BitField<16, 16, u32> input_height;
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};
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union {
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u32 flags;
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BitField< 0, 1, u32> flip_data; // flips input data horizontally (TODO) if true
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BitField< 8, 3, PixelFormat> input_format;
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BitField<12, 3, PixelFormat> output_format;
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BitField<16, 1, u32> output_tiled; // stores output in a tiled format
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// TODO: Not really sure if this actually scales, or even resizes at all.
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BitField<24, 1, u32> scale_horizontally;
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};
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INSERT_PADDING_WORDS(0x1);
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// it seems that writing to this field triggers the display transfer
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u32 trigger;
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} display_transfer_config;
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ASSERT_MEMBER_SIZE(display_transfer_config, 0x1c);
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INSERT_PADDING_WORDS(0x331);
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struct {
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// command list size (in bytes)
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u32 size;
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INSERT_PADDING_WORDS(0x1);
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// command list address
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u32 address;
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INSERT_PADDING_WORDS(0x1);
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// it seems that writing to this field triggers command list processing
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u32 trigger;
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inline u32 GetPhysicalAddress() const {
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return DecodeAddressRegister(address);
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}
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} command_processor_config;
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ASSERT_MEMBER_SIZE(command_processor_config, 0x14);
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INSERT_PADDING_WORDS(0x9c3);
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#undef INSERT_PADDING_WORDS_HELPER1
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#undef INSERT_PADDING_WORDS_HELPER2
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#undef INSERT_PADDING_WORDS
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static inline size_t NumIds() {
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return sizeof(Regs) / sizeof(u32);
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}
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u32& operator [] (int index) const {
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u32* content = (u32*)this;
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return content[index];
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}
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u32& operator [] (int index) {
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u32* content = (u32*)this;
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return content[index];
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}
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private:
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/*
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* Most physical addresses which GPU registers refer to are 8-byte aligned.
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* This function should be used to get the address from a raw register value.
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*/
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static inline u32 DecodeAddressRegister(u32 register_value) {
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return register_value * 8;
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}
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};
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static_assert(std::is_standard_layout<Regs>::value, "Structure does not use standard layout");
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// TODO: MSVC does not support using offsetof() on non-static data members even though this
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// is technically allowed since C++11. This macro should be enabled once MSVC adds
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// support for that.
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#ifndef _MSC_VER
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#define ASSERT_REG_POSITION(field_name, position) \
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static_assert(offsetof(Regs, field_name) == position * 4, \
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"Field "#field_name" has invalid position")
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ASSERT_REG_POSITION(memory_fill_config[0], 0x00004);
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ASSERT_REG_POSITION(memory_fill_config[1], 0x00008);
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ASSERT_REG_POSITION(framebuffer_config[0], 0x00117);
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ASSERT_REG_POSITION(framebuffer_config[1], 0x00157);
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ASSERT_REG_POSITION(display_transfer_config, 0x00300);
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ASSERT_REG_POSITION(command_processor_config, 0x00638);
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#undef ASSERT_REG_POSITION
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#endif // !defined(_MSC_VER)
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// The total number of registers is chosen arbitrarily, but let's make sure it's not some odd value anyway.
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static_assert(sizeof(Regs) == 0x1000 * sizeof(u32), "Invalid total size of register set");
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extern Regs g_regs;
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extern bool g_skip_frame;
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template <typename T>
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void Read(T &var, const u32 addr);
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template <typename T>
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void Write(u32 addr, const T data);
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/// Update hardware
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void Update();
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/// Initialize hardware
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void Init();
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/// Shutdown hardware
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void Shutdown();
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} // namespace
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