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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 author: Miloslav Ciz
license: CC0 1.0 license: CC0 1.0
@ -10,8 +14,16 @@
#include <stdint.h> #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 #define S3L_FRACTIONS_PER_UNIT 1024
typedef int16_t S3L_ScreenCoord; typedef int16_t S3L_ScreenCoord;
typedef struct typedef struct
@ -26,14 +38,14 @@ typedef struct
S3L_ScreenCoord x; ///< Screen X coordinate. S3L_ScreenCoord x; ///< Screen X coordinate.
S3L_ScreenCoord y; ///< Screen Y coordinate. S3L_ScreenCoord y; ///< Screen Y coordinate.
S3L_Unit barycentric0; /**< Barycentric coord A (corresponds to 1st vertex). S3L_Unit barycentric0; /**< Barycentric coord 0 (corresponds to 1st vertex).
Together with B and C coords these serve to Together with 1 and 2 coords these serve to
locate the pixel on a triangle and interpolate locate the pixel on a triangle and interpolate
values between it's three points. The sum of the values between it's three points. The sum of the
three coordinates will always be exactly three coordinates will always be exactly
S3L_FRACTIONS_PER_UNIT. */ S3L_FRACTIONS_PER_UNIT. */
S3L_Unit barycentric1; ///< Baryc. coord B (corresponds to 2nd vertex). S3L_Unit barycentric1; ///< Baryc. coord 1 (corresponds to 2nd vertex).
S3L_Unit barycentric2; ///< Baryc. coord C (corresponds to 3rd vertex). S3L_Unit barycentric2; ///< Baryc. coord 2 (corresponds to 3rd vertex).
} S3L_PixelInfo; } S3L_PixelInfo;
#define S3L_BACKFACE_CULLING_NONE 0 #define S3L_BACKFACE_CULLING_NONE 0