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lmdave
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Initial collision detection code. Collides left and right movement.

This commit is contained in:
Slipyx 2018-07-12 00:50:40 -04:00
parent 4fe16c1aae
commit 69c3343160
2 changed files with 51 additions and 3 deletions
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49
lmdave.c
View File

@ -72,15 +72,56 @@ void clear_input() {
gs->ds.try_jump = 0;
}
// returns 1 if passed pixel point is not within a solid tile
uint8_t is_clear( uint16_t px, uint16_t py ) {
uint8_t tx, ty; // tile pos
uint8_t til; // tile index
// pixel point to tile pos
tx = px / TILE_SIZE; ty = py / TILE_SIZE;
// tile index at level's tx, ty pos
til = gs->levels[gs->current_level].tiles[ty * 100 + tx];
// solid tiles
if ( til == 1 || til == 3 || til == 5 ) return 0;
if ( til >= 15 && til <= 19 ) return 0;
if ( til >= 21 && til <= 24 ) return 0;
if ( til >= 29 && til <= 30 ) return 0;
return 1;
}
// update collision point clear flags
void check_collision() {
// 8 points of collision; relative to top left of tile 56 neutral frame (20x16)
// 0, 1 = top left, top right, above sprite
gs->ds.col_point[0] = is_clear( gs->ds.px + 4, gs->ds.py - 1 );
gs->ds.col_point[1] = is_clear( gs->ds.px + 10, gs->ds.py - 1 );
// 2, 3 = right edge
gs->ds.col_point[2] = is_clear( gs->ds.px + 11, gs->ds.py + 4 );
gs->ds.col_point[3] = is_clear( gs->ds.px + 11, gs->ds.py + 12 );
// 4, 5 = bottom edge
gs->ds.col_point[4] = is_clear( gs->ds.px + 10, gs->ds.py + 16 );
gs->ds.col_point[5] = is_clear( gs->ds.px + 4, gs->ds.py + 16 );
// 6, 7 = left edge
gs->ds.col_point[6] = is_clear( gs->ds.px + 3, gs->ds.py + 12 );
gs->ds.col_point[7] = is_clear( gs->ds.px + 3, gs->ds.py + 4 );
// update on_ground flag if bottom edge points (4,5) are not clear
gs->ds.on_ground = (!gs->ds.col_point[4] && !gs->ds.col_point[5]);
}
// validate input whose try flags were set
void verify_input() {
if ( gs->ds.try_right ) {
// right; col points 2, 3
if ( gs->ds.try_right && gs->ds.col_point[2] && gs->ds.col_point[3] ) {
gs->ds.do_right = 1;
}
if ( gs->ds.try_left ) {
// left; col points 6, 7
if ( gs->ds.try_left && gs->ds.col_point[6] && gs->ds.col_point[7] ) {
gs->ds.do_left = 1;
}
if ( gs->ds.try_jump ) {
// jump; on_ground and col points 0, 1
if ( gs->ds.try_jump && gs->ds.on_ground && gs->ds.col_point[0] && gs->ds.col_point[1] ) {
gs->ds.do_jump = 1;
}
}
@ -117,6 +158,8 @@ void update_game() {
if ( gs->current_level > NUM_EXE_LEVELS - 1 )
gs->current_level = NUM_EXE_LEVELS - 1;*/
// update collision point flags
check_collision();
// verify input try flags
verify_input();
// apply dave movement

5
lmdave.h
View File

@ -10,6 +10,8 @@
typedef struct {
uint8_t tx, ty; // tile pos
uint16_t px, py; // pixel pos
// on ground flag
uint8_t on_ground;
// input flags
uint8_t try_right;
@ -19,6 +21,9 @@ typedef struct {
uint8_t do_right;
uint8_t do_left;
uint8_t do_jump;
// collision point clear flags; 1 = clear
uint8_t col_point[8];
} dave_state_t;
// global game state