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cam frustum

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ABelliqueux 2021-03-26 15:39:24 +01:00
parent ac855a0fd4
commit 735295c197
1 changed files with 41 additions and 2 deletions
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43
3dcam-tri-quads.c
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@ -48,6 +48,12 @@
#define FOV CENTERX // With a FOV of 1/2, camera focal length is ~= 16 mm / 90°
// Lower values mean wider angle
// Camera frustum : 4:3 aspect ratio
// normalized to 0-4096
#define HH 3072 // half height == tan(90/2) == 1
#define HW 4096 // half width == HH * (4/3) ~= 1.333
// pixel > cm : used in physics calculations
@ -73,7 +79,7 @@
// dotproduct of two vectors
#define dotProduct(v0, v1) \
(v0).vx * (v1).vx + \
(v0).vx * (v1).vx + \
(v0).vy * (v1).vy + \
(v0).vz * (v1).vz
@ -94,6 +100,11 @@
(v0).vz - (v1).vz
#define normalizeVector(v) \
((v)->vx << 12) >> 8, \
((v)->vy << 12) >> 8, \
((v)->vz << 12) >> 8
// Display and draw environments, double buffered
DISPENV disp[2];
@ -229,6 +240,24 @@ int lerping = 0;
short curCamAngle = 0;
// Cam frustum
//~ VECTOR TL = { -CENTERX, -CENTERY, FOV };
//~ VECTOR TR = { CENTERX, -CENTERY, FOV };
//~ VECTOR BR = { CENTERX, CENTERY, FOV };
//~ VECTOR BL = { -CENTERX, CENTERY, FOV };
VECTOR TL = { -HW, -HH, ONE };
VECTOR TR = { HW, -HH, ONE };
VECTOR BR = { HW, HH, ONE };
VECTOR BL = { -HW, HH, ONE };
// Inverted Cam coordinates for Forward Vector calc
VECTOR InvCamPos = {0,0,0,0};
@ -322,7 +351,7 @@ void applyAcceleration(BODY * actor);
void callback();
int main() {
// FIXME : Poly subdiv
//~ DIVPOLYGON4 div4 = { 0 };
@ -992,6 +1021,16 @@ int main() {
FntPrint("Actor : %d %d\n", actorPtr->pos2D.vx + actorPtr->body->max.vx / 2, actorPtr->pos2D.vy);
//~ FntPrint("%d %d %d\n", normalizeVector(&TL));
//~ FntPrint("%d %d %d\n", normalizeVector(&TR));
//~ FntPrint("%d %d %d\n", normalizeVector(&BR));
//~ FntPrint("%d %d %d\n", normalizeVector(&BL));
FntFlush(-1);
display();