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https://github.com/Ed94/HandmadeHero.git
synced 2024-09-20 11:47:34 -07:00
79 lines
2.2 KiB
C++
79 lines
2.2 KiB
C++
using GetSoundSampleValueFn = s16( EngineState* state, AudioBuffer* sound_buffer );
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internal s16
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square_wave_sample_value( EngineState* state, AudioBuffer* sound_buffer )
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{
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s32 wave_period = sound_buffer->samples_per_second / state->wave_tone_hz;
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s32 sample_value = (sound_buffer->running_sample_index / (wave_period / 2) ) % 2 ?
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state->tone_volume : - state->tone_volume;
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return scast(s16, sample_value);
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}
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internal s16
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sine_wave_sample_value( EngineState* state, AudioBuffer* sound_buffer )
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{
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f32& time = state->sample_wave_sine_time;
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s32 wave_period = sound_buffer->samples_per_second / state->wave_tone_hz;
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// time = TAU * (f32)sound_buffer->RunningSampleIndex / (f32)SoundTest_WavePeriod;
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f32 sine_value = sinf( time );
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s16 sample_value = scast(s16, sine_value * scast(f32, state->tone_volume));
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time += TAU * 1.0f / scast(f32, wave_period );
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if ( time > TAU )
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{
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time -= TAU;
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}
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return sample_value;
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}
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internal void
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render_weird_graident(OffscreenBuffer* buffer, u32 x_offset, u32 y_offset )
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{
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// TODO(Ed): See if with optimizer if buffer should be passed by value.
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struct Pixel {
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u8 Blue;
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u8 Green;
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u8 Red;
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u8 Alpha;
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};
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u8* row = rcast( u8*, buffer->memory);
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local_persist float wildcard = 0;
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for ( u32 y = 0; y < buffer->height; ++ y )
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{
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// u8* pixel = rcast(u8*, row);
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// Pixel* pixel = rcast( Pixel*, row );
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u32* pixel = rcast(u32*, row);
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for ( u32 x = 0; x < buffer->width; ++ x )
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{
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/* Pixel in memory:
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-----------------------------------------------
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Pixel + 0 Pixel + 1 Pixel + 2 Pixel + 3
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RR GG GG XX
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-----------------------------------------------
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x86-64 : Little Endian Arch
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0x XX BB GG RR
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*/
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#if 0
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u8 blue = scast(u8, x + x_offset * u8(wildcard) % 256);
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u8 green = scast(u8, y + y_offset - u8(wildcard) % 128);
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u8 red = scast(u8, wildcard) % 256 - x * 0.4f;
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#else
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u8 red = scast(u8, y + y_offset);
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u8 green = scast(u8, x + x_offset);
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u8 blue = scast(u8, x + y_offset) - scast(u8, y + y_offset);
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// blue *= 2;
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#endif
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*pixel++ = u32(red/2 << 16) | u32(green/6 << 0) | blue/2 << 0;
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}
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wildcard += 0.5375f;
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row += buffer->pitch;
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}
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}
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