mirror of
https://gitlab.com/drummyfish/anarch.git
synced 2024-11-23 17:32:16 -05:00
92 lines
2.8 KiB
Diff
92 lines
2.8 KiB
Diff
This is a mod for Anarch that adds a simple CRT screen effect (scanlines plus
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screen warp). By drummyfish.
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diff --git a/game.h b/game.h
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index 24285cb..4625ba1 100755
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--- a/game.h
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+++ b/game.h
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@@ -816,24 +816,32 @@ uint16_t SFG_keyRegisters(uint8_t key)
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return SFG_keyJustPressed(key) || SFG_keyRepeated(key);
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}
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-#if SFG_RESOLUTION_SCALEDOWN == 1
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- #define SFG_setGamePixel SFG_setPixel
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-#else
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+uint8_t SFG_screenWarpMap[SFG_GAME_RESOLUTION_X][SFG_GAME_RESOLUTION_Y];
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/**
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Sets the game pixel (a pixel that can potentially be bigger than the screen
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pixel).
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*/
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-static inline void SFG_setGamePixel(uint16_t x, uint16_t y, uint8_t colorIndex)
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+static inline void SFG_setGamePixel(int16_t x, int16_t y, uint8_t colorIndex)
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{
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- uint16_t screenY = y * SFG_RESOLUTION_SCALEDOWN;
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- uint16_t screenX = x * SFG_RESOLUTION_SCALEDOWN;
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+ int16_t screenX = x - SFG_GAME_RESOLUTION_X / 2;
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+ int16_t screenY = y - SFG_GAME_RESOLUTION_Y / 2;
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+
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+ uint8_t mul = SFG_screenWarpMap[x][y];
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+
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+ screenX = (screenX * mul) / 128;
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+ screenY = (screenY * mul) / 128;
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- for (uint16_t j = screenY; j < screenY + SFG_RESOLUTION_SCALEDOWN; ++j)
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- for (uint16_t i = screenX; i < screenX + SFG_RESOLUTION_SCALEDOWN; ++i)
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+ screenX = (screenX + SFG_GAME_RESOLUTION_X / 2) * SFG_RESOLUTION_SCALEDOWN;
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+ screenY = (screenY + SFG_GAME_RESOLUTION_Y / 2) * SFG_RESOLUTION_SCALEDOWN;
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+
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+ // scanline effect:
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+ colorIndex -= ((screenY / 2) % 2) && (colorIndex % 8 != 0);
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+
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+ for (int16_t j = screenY; j < screenY + SFG_RESOLUTION_SCALEDOWN; ++j)
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+ for (int16_t i = screenX; i < screenX + SFG_RESOLUTION_SCALEDOWN; ++i)
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SFG_setPixel(i,j,colorIndex);
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}
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-#endif
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void SFG_recomputePLayerDirection()
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{
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@@ -1691,6 +1699,23 @@ void SFG_init()
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SFG_game.cheatState = 0;
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SFG_game.continues = 1;
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+ for (int32_t y = 0; y < SFG_GAME_RESOLUTION_Y; ++y)
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+ for (int32_t x = 0; x < SFG_GAME_RESOLUTION_X; ++x)
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+ {
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+ int32_t dx = x - SFG_GAME_RESOLUTION_X / 2;
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+ dx = (dx * dx) / 512;
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+
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+ int32_t dy = y - SFG_GAME_RESOLUTION_Y / 2;
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+ dy = (dy * dy) / 512;
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+
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+ SFG_screenWarpMap[x][y] = 128 -
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+ ((dx + dy) * SFG_SCREEN_WARP) /
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+ (
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+ ((SFG_GAME_RESOLUTION_X * SFG_GAME_RESOLUTION_X) +
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+ (SFG_GAME_RESOLUTION_Y * SFG_GAME_RESOLUTION_Y)) / (4 * 512)
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+ );
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+ }
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+
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RCL_initRayConstraints(&SFG_game.rayConstraints);
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SFG_game.rayConstraints.maxHits = SFG_RAYCASTING_MAX_HITS;
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SFG_game.rayConstraints.maxSteps = SFG_RAYCASTING_MAX_STEPS;
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diff --git a/settings.h b/settings.h
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index 2c8820a..663fcec 100644
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--- a/settings.h
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+++ b/settings.h
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@@ -84,6 +84,13 @@
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#define SFG_SCREEN_RESOLUTION_Y 600
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#endif
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+/**
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+ Sets the amount of screen warp for the CRT simulation effect.
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+*/
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+#ifndef SFG_SCREEN_WARP
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+ #define SFG_SCREEN_WARP 16
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+#endif
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+
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/**
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How quickly player turns left/right, in degrees per second.
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*/
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