Increase CPU cycle count per frame to smooth input
This commit is contained in:
parent
77346c3674
commit
4a77719d89
132
src/dchip8.cpp
132
src/dchip8.cpp
@ -290,31 +290,31 @@ FILE_SCOPE Chip8Controller dchip8_controller_map_input(PlatformInput input)
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Chip8Controller result = {};
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result.key[0x01] = input.key_1.isDown;
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result.key[0x02] = input.key_2.isDown;
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result.key[0x03] = input.key_3.isDown;
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result.key[0x0C] = input.key_4.isDown;
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result.key[0x01] = input.key_1.endedDown;
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result.key[0x02] = input.key_2.endedDown;
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result.key[0x03] = input.key_3.endedDown;
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result.key[0x0C] = input.key_4.endedDown;
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result.key[0x04] = input.key_q.isDown;
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result.key[0x05] = input.key_w.isDown;
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result.key[0x06] = input.key_e.isDown;
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result.key[0x0D] = input.key_r.isDown;
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result.key[0x04] = input.key_q.endedDown;
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result.key[0x05] = input.key_w.endedDown;
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result.key[0x06] = input.key_e.endedDown;
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result.key[0x0D] = input.key_r.endedDown;
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result.key[0x07] = input.key_a.isDown;
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result.key[0x08] = input.key_s.isDown;
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result.key[0x09] = input.key_d.isDown;
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result.key[0x0E] = input.key_f.isDown;
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result.key[0x07] = input.key_a.endedDown;
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result.key[0x08] = input.key_s.endedDown;
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result.key[0x09] = input.key_d.endedDown;
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result.key[0x0E] = input.key_f.endedDown;
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result.key[0x0A] = input.key_z.isDown;
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result.key[0x00] = input.key_x.isDown;
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result.key[0x0B] = input.key_c.isDown;
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result.key[0x0F] = input.key_v.isDown;
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result.key[0x0A] = input.key_z.endedDown;
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result.key[0x00] = input.key_x.endedDown;
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result.key[0x0B] = input.key_c.endedDown;
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result.key[0x0F] = input.key_v.endedDown;
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return result;
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}
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void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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PlatformMemory memory)
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PlatformMemory memory, u32 cyclesToEmulate)
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{
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DQNT_ASSERT(cpu.indexRegister >= 0 && cpu.indexRegister <= 0xFFF);
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DQNT_ASSERT(cpu.programCounter >= 0 && cpu.programCounter <= 0xFFF);
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@ -333,7 +333,7 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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if (cpu.state == chip8state_load_file)
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{
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PlatformFile file = {};
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if (platform_open_file(L"roms/pong", &file))
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if (platform_open_file(L"roms/brix", &file))
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{
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DQNT_ASSERT((cpu.INIT_ADDRESS + file.size) <=
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memory.permanentMemSize);
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@ -359,7 +359,7 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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if (controller.key[keyVal])
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{
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u8 regIndex = cpu.storeKeyToRegisterIndex;
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DQNT_ASSERT(keyVal >= 0 && keyVal < 0x0F);
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DQNT_ASSERT(keyVal >= 0 && keyVal <= 0x0F);
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cpu.registerArray[regIndex] = (u8)keyVal;
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cpu.state = chip8state_running;
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@ -369,10 +369,13 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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}
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if (cpu.state == chip8state_running)
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{
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bool earlyExit = false;
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for (u32 opCycle = 0; opCycle < cyclesToEmulate && !earlyExit;
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opCycle++)
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{
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u8 opHighByte = mainMem[cpu.programCounter++];
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u8 opLowByte = mainMem[cpu.programCounter++];
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u8 opFirstNibble = (opHighByte & 0xF0);
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switch (opFirstNibble)
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{
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@ -407,7 +410,8 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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{
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DQNT_ASSERT(opFirstNibble == 0x20);
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cpu.stack[cpu.stackPointer++] = cpu.programCounter;
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DQNT_ASSERT(cpu.stackPointer < DQNT_ARRAY_COUNT(cpu.stack));
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DQNT_ASSERT(cpu.stackPointer <
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DQNT_ARRAY_COUNT(cpu.stack));
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}
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cpu.programCounter = loc;
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@ -441,10 +445,12 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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case 0x50:
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{
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u8 firstRegNum = (0x0F & opHighByte);
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DQNT_ASSERT(firstRegNum < DQNT_ARRAY_COUNT(cpu.registerArray));
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DQNT_ASSERT(firstRegNum <
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DQNT_ARRAY_COUNT(cpu.registerArray));
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u8 secondRegNum = (0xF0 & opLowByte) >> 4;
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DQNT_ASSERT(secondRegNum < DQNT_ARRAY_COUNT(cpu.registerArray));
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DQNT_ASSERT(secondRegNum <
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DQNT_ARRAY_COUNT(cpu.registerArray));
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u8 *vx = &cpu.registerArray[firstRegNum];
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u8 *vy = &cpu.registerArray[secondRegNum];
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@ -478,10 +484,12 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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case 0x80:
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{
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u8 firstRegNum = (0x0F & opHighByte);
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DQNT_ASSERT(firstRegNum < DQNT_ARRAY_COUNT(cpu.registerArray));
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DQNT_ASSERT(firstRegNum <
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DQNT_ARRAY_COUNT(cpu.registerArray));
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u8 secondRegNum = (0xF0 & opLowByte) >> 4;
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DQNT_ASSERT(secondRegNum < DQNT_ARRAY_COUNT(cpu.registerArray));
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DQNT_ASSERT(secondRegNum <
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DQNT_ARRAY_COUNT(cpu.registerArray));
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u8 *vx = &cpu.registerArray[firstRegNum];
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u8 *vy = &cpu.registerArray[secondRegNum];
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@ -531,7 +539,6 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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cpu.VF = 0;
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*vx = (u8)(256 + *vx - *vy);
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}
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}
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// SHR Vx {, Vy} - 8xy6 - Set Vx = Vx SHR 1
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else if (opFourthNibble == 0x06)
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@ -543,7 +550,8 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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*vx >>= 1;
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}
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// SUBN Vx {, Vy} - 8xy7 - Set Vx = Vy - Vx, set VF = NOT borrow
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// SUBN Vx {, Vy} - 8xy7 - Set Vx = Vy - Vx, set VF = NOT
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// borrow
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else if (opFourthNibble == 0x07)
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{
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if (*vy > *vx)
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@ -556,7 +564,6 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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cpu.VF = 0;
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*vx = (u8)(256 + *vy - *vx);
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}
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}
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// SHL Vx {, Vy} - 8xyE - Set Vx = SHL 1
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else
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@ -576,10 +583,12 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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case 0x90:
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{
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u8 firstRegNum = (0x0F & opHighByte);
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DQNT_ASSERT(firstRegNum < DQNT_ARRAY_COUNT(cpu.registerArray));
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DQNT_ASSERT(firstRegNum <
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DQNT_ARRAY_COUNT(cpu.registerArray));
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u8 secondRegNum = (0xF0 & opLowByte) >> 4;
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DQNT_ASSERT(secondRegNum < DQNT_ARRAY_COUNT(cpu.registerArray));
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DQNT_ASSERT(secondRegNum <
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DQNT_ARRAY_COUNT(cpu.registerArray));
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u8 *vx = &cpu.registerArray[firstRegNum];
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u8 *vy = &cpu.registerArray[secondRegNum];
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@ -599,7 +608,8 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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// JP V0, addr - Bnnn - Jump to location (nnn + V0)
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case 0xB0:
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{
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u16 addr = (((0x0F & opHighByte) << 8) | opLowByte) + cpu.V0;
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u16 addr =
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(((0x0F & opHighByte) << 8) | opLowByte) + cpu.V0;
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cpu.programCounter = addr;
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}
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break;
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@ -619,13 +629,15 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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}
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break;
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// DRW Vx, Vy, nibble - Dxyn - Display n-byte sprite starting at mem
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// DRW Vx, Vy, nibble - Dxyn - Display n-byte sprite starting at
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// mem
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// location I at (Vx, Vy), set VF = collision
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case 0xD0:
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{
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u8 xRegister = (0x0F & opHighByte);
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u8 yRegister = (0xF0 & opLowByte) >> 4;
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DQNT_ASSERT(xRegister < DQNT_ARRAY_COUNT(cpu.registerArray) &&
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DQNT_ASSERT(
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xRegister < DQNT_ARRAY_COUNT(cpu.registerArray) &&
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yRegister < DQNT_ARRAY_COUNT(cpu.registerArray));
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u8 initPosX = cpu.registerArray[xRegister];
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@ -647,9 +659,10 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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if (posY >= renderBuffer.height) posY = 0;
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// NOTE: Flip the Y
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posY = ((u8)(renderBuffer.height-1) - posY);
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posY = ((u8)(renderBuffer.height - 1) - posY);
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const i32 ALPHA_BYTE_INTERVAL = renderBuffer.bytesPerPixel;
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const i32 ALPHA_BYTE_INTERVAL =
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renderBuffer.bytesPerPixel;
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const i32 BITS_IN_BYTE = 8;
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i32 baseBitShift = BITS_IN_BYTE - 1;
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for (i32 shift = 0; shift < BITS_IN_BYTE; shift++)
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@ -660,8 +673,10 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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u32 bitmapOffset =
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(posX * BYTES_PER_PIXEL) + (posY * pitch);
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// NOTE: Since we are using a 4bpp bitmap, let's use the
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// alpha channel to determine if a pixel is on or not.
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// NOTE: Since we are using a 4bpp bitmap, let's use
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// the
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// alpha channel to determine if a pixel is on or
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// not.
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u32 *pixel = (u32 *)(&renderBitmap[bitmapOffset]);
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u8 alphaBit = (*pixel >> 24);
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@ -672,7 +687,8 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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bool spriteBit = ((spriteBytes >> bitShift) & 1);
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bool pixelIsOn = (pixelWasOn ^ spriteBit);
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// NOTE: If caused a pixel to XOR into off, then this is
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// NOTE: If caused a pixel to XOR into off, then
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// this is
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// known as a "collision" in chip8
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if (pixelWasOn && !pixelIsOn) collisionFlag = true;
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@ -700,13 +716,15 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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DQNT_ASSERT(vx < DQNT_ARRAY_COUNT(controller.key));
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bool skipNextInstruction = false;
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// SKP Vx - Ex9E - Skip next instruction if key with the value
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// SKP Vx - Ex9E - Skip next instruction if key with the
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// value
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// of Vx is pressed
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if (opLowByte == 0x9E)
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{
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skipNextInstruction = controller.key[vx];
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}
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// SKNP Vx - ExA1 - Skip next instruction if key with the value
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// SKNP Vx - ExA1 - Skip next instruction if key with the
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// value
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// of Vx is not pressed
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else
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{
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@ -729,12 +747,14 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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{
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*vx = cpu.delayTimer;
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}
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// LD Vx, K - Fx0A - Wait for a key press, store the value of
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// LD Vx, K - Fx0A - Wait for a key press, store the value
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// of
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// the key in Vx
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else if (opLowByte == 0x0A)
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{
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cpu.state = chip8state_await_input;
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cpu.storeKeyToRegisterIndex = regNum;
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earlyExit = true;
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}
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// LD DT, Vx - Fx15 - Set delay timer = Vx
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else if (opLowByte == 0x15)
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@ -764,11 +784,13 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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cpu.I = START_ADDR_OF_FONT +
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(hexCharFromFontSet * BYTES_PER_FONT);
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}
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// LD B, Vx - Fx33 - Store BCD representations of Vx in memory
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// LD B, Vx - Fx33 - Store BCD representations of Vx in
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// memory
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// locations I, I+1 and I+2
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else if (opLowByte == 0x33)
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{
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DQNT_ASSERT(regNum < DQNT_ARRAY_COUNT(cpu.registerArray));
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DQNT_ASSERT(regNum <
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DQNT_ARRAY_COUNT(cpu.registerArray));
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u8 vxVal = *vx;
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const i32 NUM_DIGITS_IN_HUNDREDS = 3;
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@ -777,10 +799,12 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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u8 rem = vxVal % 10;
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vxVal /= 10;
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mainMem[cpu.I + ((NUM_DIGITS_IN_HUNDREDS-1) - i)] = rem;
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mainMem[cpu.I +
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((NUM_DIGITS_IN_HUNDREDS - 1) - i)] = rem;
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}
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}
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// LD [I], Vx - Fx55 - Store register V0 through Vx in memory
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// LD [I], Vx - Fx55 - Store register V0 through Vx in
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// memory
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// starting at location I.
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else if (opLowByte == 0x55)
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{
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@ -791,7 +815,8 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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cpu.registerArray[regIndex];
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}
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}
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// LD [I], Vx - Fx65 - Read registers V0 through Vx from memory
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// LD [I], Vx - Fx65 - Read registers V0 through Vx from
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// memory
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// starting at location I.
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else
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{
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@ -806,7 +831,7 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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}
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break;
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};
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}
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// IMPORTANT: Timers need to be decremented at a rate of 60hz. Since we
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// can run the interpreter faster than that, make sure we decrement
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// timers at the fixed rate.
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@ -819,9 +844,16 @@ void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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{
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cpu.elapsedTime = 0;
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if (cpu.delayTimer > 0) cpu.delayTimer--;
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// TODO(doyle): This needs to play a buzzing sound whilst timer
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// > 0
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if (cpu.soundTimer > 0) cpu.soundTimer--;
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if (cpu.soundTimer > 0)
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{
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cpu.soundTimer--;
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if (cpu.soundTimer == 1)
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{
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// TODO(doyle): This needs to play a buzzing sound
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// whilst timer > 0
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}
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}
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}
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}
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else
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@ -4,6 +4,6 @@
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#include "dchip8_platform.h"
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void dchip8_update(PlatformRenderBuffer renderBuffer, PlatformInput input,
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PlatformMemory memory);
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PlatformMemory memory, u32 cyclesToEmulate);
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#endif
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@ -46,8 +46,8 @@ enum Key
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typedef struct KeyState
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{
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bool isDown;
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u32 transitionCount;
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bool endedDown;
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u32 halfTransitionCount;
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} KeyState;
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typedef struct PlatformInput
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@ -115,14 +115,13 @@ inline FILE_SCOPE LARGE_INTEGER win32_query_perf_counter_time()
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return result;
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}
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FILE_SCOPE inline void win32_parse_key_msg(KeyState *key, MSG msg)
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FILE_SCOPE inline void win32_update_key(KeyState *key, bool isDown)
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{
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LPARAM lParam = msg.lParam;
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bool keyIsDown = ((lParam >> 30) & 1);
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bool keyTransitioned = ((lParam >> 31) & 1);
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key->isDown = keyIsDown;
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if (keyTransitioned) key->transitionCount++;
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if (key->endedDown != isDown)
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{
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key->endedDown = isDown;
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key->halfTransitionCount++;
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}
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}
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FILE_SCOPE void win32_process_messages(HWND window, PlatformInput *input)
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@ -137,37 +136,38 @@ FILE_SCOPE void win32_process_messages(HWND window, PlatformInput *input)
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case WM_KEYDOWN:
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case WM_KEYUP:
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{
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bool isDown = (msg.message == WM_KEYDOWN);
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switch (msg.wParam)
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{
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case VK_UP: win32_parse_key_msg(&input->up, msg); break;
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case VK_DOWN: win32_parse_key_msg(&input->down, msg); break;
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case VK_LEFT: win32_parse_key_msg(&input->left, msg); break;
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case VK_RIGHT: win32_parse_key_msg(&input->right, msg); break;
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case VK_UP: win32_update_key(&input->up, isDown); break;
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case VK_DOWN: win32_update_key(&input->down, isDown); break;
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case VK_LEFT: win32_update_key(&input->left, isDown); break;
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case VK_RIGHT: win32_update_key(&input->right, isDown); break;
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case '1': win32_parse_key_msg(&input->key_1, msg); break;
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case '2': win32_parse_key_msg(&input->key_2, msg); break;
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case '3': win32_parse_key_msg(&input->key_3, msg); break;
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case '4': win32_parse_key_msg(&input->key_4, msg); break;
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case '1': win32_update_key(&input->key_1, isDown); break;
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case '2': win32_update_key(&input->key_2, isDown); break;
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case '3': win32_update_key(&input->key_3, isDown); break;
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case '4': win32_update_key(&input->key_4, isDown); break;
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case 'Q': win32_parse_key_msg(&input->key_q, msg); break;
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case 'W': win32_parse_key_msg(&input->key_w, msg); break;
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case 'E': win32_parse_key_msg(&input->key_e, msg); break;
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case 'R': win32_parse_key_msg(&input->key_r, msg); break;
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case 'Q': win32_update_key(&input->key_q, isDown); break;
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case 'W': win32_update_key(&input->key_w, isDown); break;
|
||||
case 'E': win32_update_key(&input->key_e, isDown); break;
|
||||
case 'R': win32_update_key(&input->key_r, isDown); break;
|
||||
|
||||
case 'A': win32_parse_key_msg(&input->key_a, msg); break;
|
||||
case 'S': win32_parse_key_msg(&input->key_s, msg); break;
|
||||
case 'D': win32_parse_key_msg(&input->key_d, msg); break;
|
||||
case 'F': win32_parse_key_msg(&input->key_f, msg); break;
|
||||
case 'A': win32_update_key(&input->key_a, isDown); break;
|
||||
case 'S': win32_update_key(&input->key_s, isDown); break;
|
||||
case 'D': win32_update_key(&input->key_d, isDown); break;
|
||||
case 'F': win32_update_key(&input->key_f, isDown); break;
|
||||
|
||||
case 'Z': win32_parse_key_msg(&input->key_z, msg); break;
|
||||
case 'X': win32_parse_key_msg(&input->key_x, msg); break;
|
||||
case 'C': win32_parse_key_msg(&input->key_c, msg); break;
|
||||
case 'V': win32_parse_key_msg(&input->key_v, msg); break;
|
||||
case 'Z': win32_update_key(&input->key_z, isDown); break;
|
||||
case 'X': win32_update_key(&input->key_x, isDown); break;
|
||||
case 'C': win32_update_key(&input->key_c, isDown); break;
|
||||
case 'V': win32_update_key(&input->key_v, isDown); break;
|
||||
|
||||
case VK_ESCAPE:
|
||||
{
|
||||
win32_parse_key_msg(&input->escape, msg);
|
||||
if (input->escape.isDown) globalRunning = false;
|
||||
win32_update_key(&input->escape, isDown);
|
||||
if (input->escape.endedDown) globalRunning = false;
|
||||
}
|
||||
break;
|
||||
|
||||
@ -279,7 +279,7 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
|
||||
platformMemory.permanentMemSize = DQNT_ARRAY_COUNT(stackMemory);
|
||||
|
||||
QueryPerformanceFrequency(&globalQueryPerformanceFrequency);
|
||||
const f32 TARGET_FRAMES_PER_S = 540.0f;
|
||||
const f32 TARGET_FRAMES_PER_S = 30.0f;
|
||||
f32 targetSecondsPerFrame = 1 / TARGET_FRAMES_PER_S;
|
||||
f32 frameTimeInS = 0.0f;
|
||||
globalRunning = true;
|
||||
@ -300,13 +300,7 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
|
||||
platformBuffer.height = globalRenderBitmap.height;
|
||||
platformBuffer.width = globalRenderBitmap.width;
|
||||
platformBuffer.bytesPerPixel = globalRenderBitmap.bytesPerPixel;
|
||||
dchip8_update(platformBuffer, platformInput, platformMemory);
|
||||
|
||||
for (i32 i = 0; i < DQNT_ARRAY_COUNT(platformInput.key); i++)
|
||||
{
|
||||
if (platformInput.key[i].isDown)
|
||||
OutputDebugString(L"Key is down\n");
|
||||
}
|
||||
dchip8_update(platformBuffer, platformInput, platformMemory, 15);
|
||||
}
|
||||
|
||||
////////////////////////////////////////////////////////////////////////
|
||||
|
||||
Loading…
Reference in New Issue
Block a user