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Add CRT mod

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This commit is contained in:
Miloslav Ciz 2022-12-03 15:42:38 +01:00
parent b078864d60
commit 0c414c7e98
1 changed files with 91 additions and 0 deletions
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@ -0,0 +1,91 @@
This is a mod for Anarch that adds a simple CRT screen effect (scanlines plus
screen warp). By drummyfish.
diff --git a/game.h b/game.h
index 24285cb..4625ba1 100755
--- a/game.h
+++ b/game.h
@@ -816,24 +816,32 @@ uint16_t SFG_keyRegisters(uint8_t key)
return SFG_keyJustPressed(key) || SFG_keyRepeated(key);
}
-#if SFG_RESOLUTION_SCALEDOWN == 1
- #define SFG_setGamePixel SFG_setPixel
-#else
+uint8_t SFG_screenWarpMap[SFG_GAME_RESOLUTION_X][SFG_GAME_RESOLUTION_Y];
/**
Sets the game pixel (a pixel that can potentially be bigger than the screen
pixel).
*/
-static inline void SFG_setGamePixel(uint16_t x, uint16_t y, uint8_t colorIndex)
+static inline void SFG_setGamePixel(int16_t x, int16_t y, uint8_t colorIndex)
{
- uint16_t screenY = y * SFG_RESOLUTION_SCALEDOWN;
- uint16_t screenX = x * SFG_RESOLUTION_SCALEDOWN;
+ int16_t screenX = x - SFG_GAME_RESOLUTION_X / 2;
+ int16_t screenY = y - SFG_GAME_RESOLUTION_Y / 2;
+
+ uint8_t mul = SFG_screenWarpMap[x][y];
+
+ screenX = (screenX * mul) / 128;
+ screenY = (screenY * mul) / 128;
- for (uint16_t j = screenY; j < screenY + SFG_RESOLUTION_SCALEDOWN; ++j)
- for (uint16_t i = screenX; i < screenX + SFG_RESOLUTION_SCALEDOWN; ++i)
+ screenX = (screenX + SFG_GAME_RESOLUTION_X / 2) * SFG_RESOLUTION_SCALEDOWN;
+ screenY = (screenY + SFG_GAME_RESOLUTION_Y / 2) * SFG_RESOLUTION_SCALEDOWN;
+
+ // scanline effect:
+ colorIndex -= ((screenY / 2) % 2) && (colorIndex % 8 != 0);
+
+ for (int16_t j = screenY; j < screenY + SFG_RESOLUTION_SCALEDOWN; ++j)
+ for (int16_t i = screenX; i < screenX + SFG_RESOLUTION_SCALEDOWN; ++i)
SFG_setPixel(i,j,colorIndex);
}
-#endif
void SFG_recomputePLayerDirection()
{
@@ -1691,6 +1699,23 @@ void SFG_init()
SFG_game.cheatState = 0;
SFG_game.continues = 1;
+ for (int32_t y = 0; y < SFG_GAME_RESOLUTION_Y; ++y)
+ for (int32_t x = 0; x < SFG_GAME_RESOLUTION_X; ++x)
+ {
+ int32_t dx = x - SFG_GAME_RESOLUTION_X / 2;
+ dx = (dx * dx) / 512;
+
+ int32_t dy = y - SFG_GAME_RESOLUTION_Y / 2;
+ dy = (dy * dy) / 512;
+
+ SFG_screenWarpMap[x][y] = 128 -
+ ((dx + dy) * SFG_SCREEN_WARP) /
+ (
+ ((SFG_GAME_RESOLUTION_X * SFG_GAME_RESOLUTION_X) +
+ (SFG_GAME_RESOLUTION_Y * SFG_GAME_RESOLUTION_Y)) / (4 * 512)
+ );
+ }
+
RCL_initRayConstraints(&SFG_game.rayConstraints);
SFG_game.rayConstraints.maxHits = SFG_RAYCASTING_MAX_HITS;
SFG_game.rayConstraints.maxSteps = SFG_RAYCASTING_MAX_STEPS;
diff --git a/settings.h b/settings.h
index 2c8820a..663fcec 100644
--- a/settings.h
+++ b/settings.h
@@ -84,6 +84,13 @@
#define SFG_SCREEN_RESOLUTION_Y 600
#endif
+/**
+ Sets the amount of screen warp for the CRT simulation effect.
+*/
+#ifndef SFG_SCREEN_WARP
+ #define SFG_SCREEN_WARP 16
+#endif
+
/**
How quickly player turns left/right, in degrees per second.
*/