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https://github.com/Ed94/HandmadeHero.git
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62 lines
1.4 KiB
C++
62 lines
1.4 KiB
C++
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#include "engine.h"
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NS_ENGINE_BEGIN
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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 blue = scast(u8, x + x_offset);
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u8 green = scast(u8, y + y_offset);
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u8 red = 0;
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#endif
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*pixel++ = (red << 16) | (green << 8) | blue;
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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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internal
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void update_and_render( OffscreenBuffer* back_buffer
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// Temp (for feature parity)
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, u32 x_offset, u32 y_offset
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)
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{
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render_weird_graident( back_buffer, x_offset, y_offset );
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}
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NS_ENGINE_END
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