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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 8557 | maxcodehac | 1 | #include "version.h" |
| 2 | |||
| 3 | #ifdef USE_PARALLAX |
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| 4 | |||
| 5 | #include "wl_def.h" |
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| 6 | |||
| 7 | #ifdef USE_FEATUREFLAGS |
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| 8 | |||
| 9 | // The lower left tile of every map determines the start texture of the parallax sky. |
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| 10 | static int GetParallaxStartTexture() |
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| 11 | { |
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| 12 | int startTex = ffDataBottomLeft; |
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| 13 | assert(startTex >= 0 && startTex < PMSpriteStart); |
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| 14 | return startTex; |
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| 15 | } |
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| 16 | |||
| 17 | #else |
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| 18 | |||
| 19 | static int GetParallaxStartTexture() |
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| 20 | { |
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| 21 | int startTex; |
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| 22 | switch(gamestate.episode * 10 + mapon) |
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| 23 | { |
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| 24 | case 0: startTex = 20; break; |
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| 25 | default: startTex = 0; break; |
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| 26 | } |
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| 27 | assert(startTex >= 0 && startTex < PMSpriteStart); |
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| 28 | return startTex; |
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| 29 | } |
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| 30 | |||
| 31 | #endif |
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| 32 | |||
| 33 | void DrawParallax(byte *vbuf, unsigned vbufPitch) |
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| 34 | { |
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| 35 | int startpage = GetParallaxStartTexture(); |
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| 36 | int midangle = player->angle * (FINEANGLES / ANGLES); |
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| 37 | int skyheight = viewheight >> 1; |
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| 38 | int curtex = -1; |
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| 39 | byte *skytex; |
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| 40 | |||
| 41 | startpage += USE_PARALLAX - 1; |
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| 42 | |||
| 43 | for(int x = 0; x < viewwidth; x++) |
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| 44 | { |
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| 45 | int curang = pixelangle[x] + midangle; |
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| 46 | if(curang < 0) curang += FINEANGLES; |
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| 47 | else if(curang >= FINEANGLES) curang -= FINEANGLES; |
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| 48 | int xtex = curang * USE_PARALLAX * TEXTURESIZE / FINEANGLES; |
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| 49 | int newtex = xtex >> TEXTURESHIFT; |
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| 50 | if(newtex != curtex) |
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| 51 | { |
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| 52 | curtex = newtex; |
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| 53 | skytex = PM_GetTexture(startpage - curtex); |
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| 54 | } |
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| 55 | int texoffs = TEXTUREMASK - ((xtex & (TEXTURESIZE - 1)) << TEXTURESHIFT); |
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| 56 | int yend = skyheight - (wallheight[x] >> 3); |
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| 57 | if(yend <= 0) continue; |
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| 58 | |||
| 59 | for(int y = 0, offs = x; y < yend; y++, offs += vbufPitch) |
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| 60 | vbuf[offs] = skytex[texoffs + (y * TEXTURESIZE) / skyheight]; |
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| 61 | } |
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| 62 | } |
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| 63 | |||
| 64 | #endif |