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Miloslav Číž 2018-11-18 18:46:10 +01:00
parent d39b83d932
commit 3a14f0de21
1 changed files with 18 additions and 6 deletions
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s3l.h
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@ -1,5 +1,9 @@
/*
WIP simple realtime 3D rasterization-based library.
WIP
Simple realtime 3D software rasterization library. It is fast, focused on
resource-limited computers, located in a single C header file, with no
dependencies, using only integer arithmetic.
author: Miloslav Ciz
license: CC0 1.0
@ -10,8 +14,16 @@
#include <stdint.h>
typedef int16_t S3L_Unit;
typedef int16_t S3L_Unit; /**< Units of measurement in 3D space. There is
S3L_FRACTIONS_PER_UNIT in one spatial unit.
By dividing the unit into fractions we
effectively achieve fixed point arithmetic.
The number of fractions is a constant that
serves as 1.0 in floating point arithmetic
(normalization etc.). */
#define S3L_FRACTIONS_PER_UNIT 1024
typedef int16_t S3L_ScreenCoord;
typedef struct
@ -26,14 +38,14 @@ typedef struct
S3L_ScreenCoord x; ///< Screen X coordinate.
S3L_ScreenCoord y; ///< Screen Y coordinate.
S3L_Unit barycentric0; /**< Barycentric coord A (corresponds to 1st vertex).
Together with B and C coords these serve to
S3L_Unit barycentric0; /**< Barycentric coord 0 (corresponds to 1st vertex).
Together with 1 and 2 coords these serve to
locate the pixel on a triangle and interpolate
values between it's three points. The sum of the
three coordinates will always be exactly
S3L_FRACTIONS_PER_UNIT. */
S3L_Unit barycentric1; ///< Baryc. coord B (corresponds to 2nd vertex).
S3L_Unit barycentric2; ///< Baryc. coord C (corresponds to 3rd vertex).
S3L_Unit barycentric1; ///< Baryc. coord 1 (corresponds to 2nd vertex).
S3L_Unit barycentric2; ///< Baryc. coord 2 (corresponds to 3rd vertex).
} S3L_PixelInfo;
#define S3L_BACKFACE_CULLING_NONE 0