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Friction, velocity, rendering

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This commit is contained in:
Dominic Masters
2025-10-09 09:44:17 -05:00
parent c31bcf7f6a
commit 7622f81309
7 changed files with 93 additions and 75 deletions
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7
src/display/camera.c
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@@ -63,6 +63,7 @@ void cameraPushMatrix(camera_t *camera) {
);
break;
case CAMERA_PROJECTION_TYPE_PERSPECTIVE_FLIPPED:
case CAMERA_PROJECTION_TYPE_PERSPECTIVE:
const float_t aspect = (
(float_t)frameBufferGetWidth(FRAMEBUFFER_BOUND) /
@@ -75,6 +76,12 @@ void cameraPushMatrix(camera_t *camera) {
camera->farClip,
projection
);
if(camera->projType == CAMERA_PROJECTION_TYPE_PERSPECTIVE_FLIPPED) {
// Flip Y axis
projection[1][1] *= -1;
}
break;
}
switch(camera->viewType) {

1
src/display/camera.h
View File

@@ -13,6 +13,7 @@
typedef enum {
CAMERA_PROJECTION_TYPE_PERSPECTIVE,
CAMERA_PROJECTION_TYPE_PERSPECTIVE_FLIPPED,
CAMERA_PROJECTION_TYPE_ORTHOGRAPHIC
} cameraprojectiontype_t;

23
src/rpg/entity/entity.c
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@@ -56,12 +56,21 @@ void entityUpdate(entity_t *entity) {
worldChunkPosAdd(&entity->position[i], entity->velocity[i]);
if(entity->velocity[i] < 0) {
entity->velocity[i] += ENTITY_FRICTION;
if(entity->velocity[i] >= -ENTITY_MIN_VELOCITY) entity->velocity[i] = 0;
} else {
entity->velocity[i] -= ENTITY_FRICTION;
if(entity->velocity[i] <= ENTITY_MIN_VELOCITY) entity->velocity[i] = 0;
}
// Friction
worldsubtile_t v = entity->velocity[i];
if (v > 0) {
v -= ENTITY_FRICTION;
if (v < ENTITY_MIN_VELOCITY) v = 0;
} else if (v < 0) {
v += ENTITY_FRICTION;
if (v > -ENTITY_MIN_VELOCITY) v = 0;
}
if ((v > 0 && v < ENTITY_FRICTION) || (v < 0 && v > -ENTITY_FRICTION)) {
v = 0;
}
entity->velocity[i] = v;
}
}

63
src/rpg/entity/player.c
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@@ -18,7 +18,6 @@ void playerMovement(entity_t *entity) {
assertNotNull(entity, "Entity pointer cannot be NULL");
// Get movement angle as 0-> normalized vector.
{
vec2 dir = {
inputAxis(INPUT_ACTION_LEFT, INPUT_ACTION_RIGHT),
inputAxis(INPUT_ACTION_DOWN, INPUT_ACTION_UP)
@@ -28,39 +27,37 @@ void playerMovement(entity_t *entity) {
entity->velocity[0] += (worldsubtile_t)(PLAYER_SPEED * dir[0]);
entity->velocity[1] += (worldsubtile_t)(PLAYER_SPEED * dir[1]);
// Update direction.
if(dir[0] > 0) {
if(entity->direction == DIRECTION_RIGHT) {
entity->direction = DIRECTION_RIGHT;
} else {
if(dir[1] < 0) {
entity->direction = DIRECTION_UP;
} else if(dir[1] > 0) {
entity->direction = DIRECTION_DOWN;
} else {
entity->direction = DIRECTION_RIGHT;
}
}
} else if(dir[0] < 0) {
if(entity->direction == DIRECTION_LEFT) {
entity->direction = DIRECTION_LEFT;
} else {
if(dir[1] < 0) {
entity->direction = DIRECTION_UP;
} else if(dir[1] > 0) {
entity->direction = DIRECTION_DOWN;
} else {
entity->direction = DIRECTION_LEFT;
}
}
} else if(dir[1] < 0) {
entity->direction = DIRECTION_UP;
} else if(dir[1] > 0) {
entity->direction = DIRECTION_DOWN;
}
// // Update direction.
// if(dir[0] > 0) {
// if(entity->direction == DIRECTION_RIGHT) {
// entity->direction = DIRECTION_RIGHT;
// } else {
// if(dir[1] < 0) {
// entity->direction = DIRECTION_UP;
// } else if(dir[1] > 0) {
// entity->direction = DIRECTION_DOWN;
// } else {
// entity->direction = DIRECTION_RIGHT;
// }
// }
// } else if(dir[0] < 0) {
// if(entity->direction == DIRECTION_LEFT) {
// entity->direction = DIRECTION_LEFT;
// } else {
// if(dir[1] < 0) {
// entity->direction = DIRECTION_UP;
// } else if(dir[1] > 0) {
// entity->direction = DIRECTION_DOWN;
// } else {
// entity->direction = DIRECTION_LEFT;
// }
// }
// } else if(dir[1] < 0) {
// entity->direction = DIRECTION_UP;
// } else if(dir[1] > 0) {
// entity->direction = DIRECTION_DOWN;
// }
}
void playerInteraction(entity_t *entity) {

2
src/rpg/entity/player.h
View File

@@ -8,7 +8,7 @@
#pragma once
#include "dusk.h"
#define PLAYER_SPEED 4
#define PLAYER_SPEED 3
#define PLAYER_INTERACTION_RANGE 1.0f
#define PLAYER_INTERACTION_SIZE 0.5f

47
src/rpg/world/worldunit.c
View File

@@ -8,32 +8,33 @@
#include "worldunit.h"
#include "assert/assert.h"
void worldChunkPosAdd(
worldchunkpos_t *pos,
const worldsubtile_t amt
) {
int8_t a = pos->subtile; // current signed subtile
int8_t b = amt; // signed delta
uint8_t unsignedAdded = (uint8_t)a + (uint8_t)b; // well-defined wrap add
int8_t r = (int8_t)unsignedAdded; // result in signed domain
void worldChunkPosAdd(worldchunkpos_t *pos, worldsubtile_t amt) {
assertNotNull(pos, "Position pointer cannot be NULL");
pos->subtile = r;
/*
int32_t sum = (int32_t)pos->subtile + (int32_t)amt;
int32_t shifted = sum + 128; // may be negative or large
int32_t carry = div_floor(shifted, 256); // tiles to add (can be neg)
int32_t rem = mod_floor(shifted, 256); // 0..255
int32_t new_sub = rem - 128; // back to [-128,127]
// Signed-overflow detection for a + b -> r:
// overflow if sign(a) == sign(b) and sign(r) != sign(a)
uint8_t ov = (uint8_t)((a ^ r) & (b ^ r)) >> 7; // 1 if overflow, else 0
pos->subtile = (int8_t)new_sub;
pos->tile = (uint8_t)((int32_t)pos->tile + carry); // wrap mod 256
*/
// Direction of carry: +1 for b >= 0, -1 for b < 0 (computed branchlessly)
uint8_t neg = ((uint8_t)b) >> 7; // 0 if b>=0, 1 if b<0
int8_t dir = (int8_t)(1 - (neg << 1)); // +1 or -1
// Apply tile adjustment (mod-256 via uint8_t arithmetic)
pos->tile = (uint8_t)(pos->tile + (uint8_t)(ov * (uint8_t)dir));
int32_t shiftedTotal = (int32_t)pos->subtile + (int32_t)amt + 128;
int32_t tileCarry = shiftedTotal >> 8; // divide by 256
int32_t wrappedSubtile = shiftedTotal - (tileCarry << 8);
pos->subtile = (int8_t)(wrappedSubtile - 128);
pos->tile = (uint8_t)(pos->tile + (uint8_t)tileCarry);
}
float_t worldChunkPosToF32(
const worldchunkpos_t pos,
const uint8_t tileSize
) {
return (float_t)(pos.tile * tileSize) + ((float_t)pos.subtile / 256.0f);
float_t worldChunkPosToF32(worldchunkpos_t pos, const uint8_t tileSize) {
const float scaleFactor = (float)tileSize * (1.0f / 256.0f);
return (
(float)pos.tile * (float)tileSize + ((float)pos.subtile + 128.0f) *
scaleFactor
);
}

7
src/scene/scene/scenemap.c
View File

@@ -12,11 +12,12 @@
#include "rpg/entity/entity.h"
#include "display/screen.h"
#define TILE_WIDTH 1
#define TILE_WIDTH 8
#define TILE_HEIGHT TILE_WIDTH
errorret_t sceneMapInit(scenedata_t *data) {
cameraInitPerspective(&data->sceneMap.camera);
data->sceneMap.camera.projType = CAMERA_PROJECTION_TYPE_PERSPECTIVE_FLIPPED;
errorOk();
}
@@ -25,7 +26,7 @@ void sceneMapUpdate(scenedata_t *data) {
}
void sceneMapRender(scenedata_t *data) {
const float_t camOffset = 12.0f;
const float_t camOffset = 32.0f;
const float_t pixelPerfectOffset = tanf(
data->sceneMap.camera.perspective.fov / 2.0f
) * ((float_t)SCREEN.height / 2.0f);
@@ -56,6 +57,8 @@ void sceneMapRenderEntity(const entity_t *entity) {
float_t x = worldChunkPosToF32(entity->position[0], TILE_WIDTH);
float_t y = worldChunkPosToF32(entity->position[1], TILE_HEIGHT);
x -= TILE_WIDTH * 0.5f;
y -= TILE_HEIGHT * 0.5f;
spriteBatchPush(
NULL,