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Allow z-buffer with FLAT

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This commit is contained in:
Miloslav Číž 2019-06-26 18:43:47 +02:00
parent d0f873c136
commit 2265ebf0ce
2 changed files with 7 additions and 6 deletions
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2
programs/level.c
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@ -12,7 +12,6 @@
#include <math.h> #include <math.h>
#include <time.h> #include <time.h>
#define S3L_FLAT 0
#define S3L_STRICT_NEAR_CULLING 0 #define S3L_STRICT_NEAR_CULLING 0
#if TEXTURES #if TEXTURES
@ -23,6 +22,7 @@
#define S3L_NEAR (S3L_FRACTIONS_PER_UNIT / 5) #define S3L_NEAR (S3L_FRACTIONS_PER_UNIT / 5)
#define S3L_FLAT 0
#define S3L_SORT 0 #define S3L_SORT 0
#define S3L_Z_BUFFER 1 #define S3L_Z_BUFFER 1
#define S3L_MAX_TRIANGES_DRAWN 512 #define S3L_MAX_TRIANGES_DRAWN 512

11
small3dlib.h
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@ -175,7 +175,7 @@ typedef uint16_t S3L_Index;
#if S3L_FLAT #if S3L_FLAT
#define S3L_COMPUTE_DEPTH 0 #define S3L_COMPUTE_DEPTH 0
#define S3L_PERSPECTIVE_CORRECTION 0 #define S3L_PERSPECTIVE_CORRECTION 0
#define S3L_Z_BUFFER 0 // don't disable z-buffer, it makes sense to use it with no sorting
#endif #endif
#ifndef S3L_PERSPECTIVE_CORRECTION #ifndef S3L_PERSPECTIVE_CORRECTION
@ -206,7 +206,9 @@ typedef uint16_t S3L_Index;
#ifndef S3L_COMPUTE_DEPTH #ifndef S3L_COMPUTE_DEPTH
/** Whether to compute depth for each pixel (fragment). Some other options /** Whether to compute depth for each pixel (fragment). Some other options
may turn this on automatically. If you don't need depth information, turning may turn this on automatically. If you don't need depth information, turning
this off can save performance. */ this off can save performance. Depth will still be accessible in
S3L_PixelInfo, but will be constant -- equal to center point depth -- over
the whole triangle. */
#define S3L_COMPUTE_DEPTH 1 #define S3L_COMPUTE_DEPTH 1
#endif #endif
@ -711,12 +713,10 @@ static inline void S3L_rotate2DPoint(S3L_Unit *x, S3L_Unit *y, S3L_Unit angle);
((S3L_RESOLUTION_Y * S3L_FRACTIONS_PER_UNIT * 2) / S3L_RESOLUTION_X) ((S3L_RESOLUTION_Y * S3L_FRACTIONS_PER_UNIT * 2) / S3L_RESOLUTION_X)
#if S3L_Z_BUFFER == 1 #if S3L_Z_BUFFER == 1
#define S3L_COMPUTE_DEPTH 1
#define S3L_MAX_DEPTH 2147483647 #define S3L_MAX_DEPTH 2147483647
S3L_Unit S3L_zBuffer[S3L_RESOLUTION_X * S3L_RESOLUTION_Y]; S3L_Unit S3L_zBuffer[S3L_RESOLUTION_X * S3L_RESOLUTION_Y];
#define S3L_zBufferFormat(depth) (depth) #define S3L_zBufferFormat(depth) (depth)
#elif S3L_Z_BUFFER == 2 #elif S3L_Z_BUFFER == 2
#define S3L_COMPUTE_DEPTH 1
#define S3L_MAX_DEPTH 255 #define S3L_MAX_DEPTH 255
uint8_t S3L_zBuffer[S3L_RESOLUTION_X * S3L_RESOLUTION_Y]; uint8_t S3L_zBuffer[S3L_RESOLUTION_X * S3L_RESOLUTION_Y];
#define S3L_zBufferFormat(depth)\ #define S3L_zBufferFormat(depth)\
@ -1800,7 +1800,6 @@ void S3L_drawTriangle(
#undef assignPoints #undef assignPoints
#if S3L_FLAT #if S3L_FLAT
p.depth = (tPointSS->z + lPointSS->z + rPointSS->z) / 3;
*barycentric0 = S3L_FRACTIONS_PER_UNIT / 3; *barycentric0 = S3L_FRACTIONS_PER_UNIT / 3;
*barycentric1 = S3L_FRACTIONS_PER_UNIT / 3; *barycentric1 = S3L_FRACTIONS_PER_UNIT / 3;
*barycentric2 = S3L_FRACTIONS_PER_UNIT - 2 * (S3L_FRACTIONS_PER_UNIT / 3); *barycentric2 = S3L_FRACTIONS_PER_UNIT - 2 * (S3L_FRACTIONS_PER_UNIT / 3);
@ -2185,6 +2184,8 @@ void S3L_drawTriangle(
p.depth = S3L_getFastLerpValue(depthFLS); p.depth = S3L_getFastLerpValue(depthFLS);
S3L_stepFastLerp(depthFLS); S3L_stepFastLerp(depthFLS);
#endif #endif
#else // !S3L_COMPUTE_DEPTH
p.depth = (tPointSS->z + lPointSS->z + rPointSS->z) / 3;
#endif #endif
#if S3L_Z_BUFFER #if S3L_Z_BUFFER