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Add texturing option to level

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This commit is contained in:
Miloslav Číž 2019-06-23 20:27:48 +02:00
parent e5988e596c
commit 8061946616
1 changed files with 32 additions and 12 deletions
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44
programs/level.c
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@ -5,6 +5,8 @@
license: CC0 1.0
*/
#define TEXTURES 1 // whether to use textures for the level
#include <SDL2/SDL.h>
#include <stdio.h>
#include <math.h>
@ -12,7 +14,13 @@
#define S3L_FLAT 0
#define S3L_STRICT_NEAR_CULLING 0
#define S3L_PERSPECTIVE_CORRECTION 2
#if TEXTURES
#define S3L_PERSPECTIVE_CORRECTION 2
#else
#define S3L_PERSPECTIVE_CORRECTION 0
#endif
#define S3L_SORT 0
#define S3L_Z_BUFFER 1
@ -34,6 +42,12 @@ S3L_Vec4 teleportPoint;
uint32_t pixels[S3L_RESOLUTION_X * S3L_RESOLUTION_Y];
uint32_t frame = 0;
uint8_t *texture = 0;
S3L_Unit *uvs = 0;
S3L_Index *uvIndices = 0;
uint32_t previousTriangle = 1000;
S3L_Vec4 uv0, uv1, uv2;
uint8_t r, g, b;
void clearScreen()
{
@ -57,14 +71,6 @@ static inline void setPixel(int x, int y, uint8_t red, uint8_t green, uint8_t bl
pixels[y * S3L_RESOLUTION_X + x] = r | g | b;
}
uint8_t *texture = 0;
S3L_Unit *uvs = 0;
S3L_Index *uvIndices = 0;
uint32_t previousTriangle = 1000;
S3L_Vec4 uv0, uv1, uv2;
void sampleTxture(S3L_Unit u, S3L_Unit v, uint8_t *r, uint8_t *g, uint8_t *b)
{
u = (u * LEVEL_TEXTURE_WIDTH) / S3L_FRACTIONS_PER_UNIT;
@ -118,6 +124,7 @@ void drawTeleport(int16_t x, int16_t y, S3L_ScreenCoord size)
void drawPixel(S3L_PixelInfo *p)
{
#if TEXTURES
if (p->triangleID != previousTriangle)
{
switch (p->modelIndex)
@ -151,11 +158,24 @@ void drawPixel(S3L_PixelInfo *p)
uv[0] = S3L_interpolateBarycentric(uv0.x,uv1.x,uv2.x,p->barycentric);
uv[1] = S3L_interpolateBarycentric(uv0.y,uv1.y,uv2.y,p->barycentric);
uint8_t r, g, b;
sampleTxture(uv[0],uv[1],&r,&g,&b);
#else
switch (p->modelIndex)
{
case 0: r = 255; g = 0; b = 0; break;
case 1: r = 0; g = 255; b = 0; break;
case 2:
default: r = 0; g = 0; b = 255; break;
}
#endif
S3L_Unit fog = (p->depth * 8) / S3L_FRACTIONS_PER_UNIT;
S3L_Unit fog = (p->depth *
#if TEXTURES
8
#else
16
#endif
) / S3L_FRACTIONS_PER_UNIT;
r = S3L_clamp(((S3L_Unit) r) - fog,0,255);
g = S3L_clamp(((S3L_Unit) g) - fog,0,255);