added simple demoreel and ps2 skeleton coded by claude fable 5

2026-08-10 09:37:04 +01:00 · 2026-08-09 01:39:54 +02:00
parent 92851aa1ed
commit 0a7eb48ce3
18 changed files with 1482 additions and 9 deletions
@@ -0,0 +1,155 @@
+#include <math.h>
+
+#include "demoreel.h"
+
+// Classic endless tunnel: fly along a wobbling closed loop,
+// vertices regenerated on the CPU every frame, im3d rendering.
+
+using namespace rw;
+
+#define SIDES 16
+#define RINGS 48
+#define NUMVERTS ((SIDES+1)*(RINGS+1))
+#define NUMINDICES (SIDES*RINGS*6)
+
+#define LOOPRADIUS 60.0f
+
+static RWDEVICE::Im3DVertex tunnelVerts[NUMVERTS];
+static uint16 tunnelIndices[NUMINDICES];
+static Texture *gridTex;
+static Matrix identMat;
+static float pathPos;
+
+// closed loop in space with some vertical wobble
+static V3d
+tunnelPath(float s)
+{
+	V3d p;
+	p.x = LOOPRADIUS*cosf(s) + 8.0f*cosf(3.0f*s);
+	p.y = LOOPRADIUS*sinf(s) + 8.0f*sinf(2.0f*s);
+	p.z = 14.0f*sinf(2.0f*s) + 5.0f*sinf(5.0f*s);
+	return p;
+}
+
+static float
+tunnelRadius(float s)
+{
+	return 6.0f + 1.5f*sinf(5.0f*s + DemoTime*2.0f);
+}
+
+static void
+pathFrame(float s, V3d *pos, V3d *t, V3d *n, V3d *b)
+{
+	static V3d worldup = { 0.0f, 0.0f, 1.0f };
+	*pos = tunnelPath(s);
+	*t = normalize(sub(tunnelPath(s+0.01f), *pos));
+	*n = normalize(cross(worldup, *t));
+	*b = cross(*t, *n);
+}
+
+static void
+TunnelInit(void)
+{
+	int i, j, v;
+
+	gridTex = MakeGridTexture();
+	identMat.setIdentity();
+	pathPos = 0.0f;
+
+	v = 0;
+	for(i = 0; i < RINGS; i++)
+		for(j = 0; j < SIDES; j++){
+			int r0 = i*(SIDES+1) + j;
+			int r1 = (i+1)*(SIDES+1) + j;
+			tunnelIndices[v++] = r0;
+			tunnelIndices[v++] = r1;
+			tunnelIndices[v++] = r0+1;
+			tunnelIndices[v++] = r0+1;
+			tunnelIndices[v++] = r1;
+			tunnelIndices[v++] = r1+1;
+		}
+}
+
+static void
+TunnelTerm(void)
+{
+	if(gridTex){
+		gridTex->destroy();
+		gridTex = nil;
+	}
+}
+
+static void
+TunnelUpdate(float dt)
+{
+	pathPos += dt*0.30f;
+
+	// camera rides the tunnel, slightly off center
+	V3d pos, t, n, b;
+	pathFrame(pathPos, &pos, &t, &n, &b);
+	V3d target = tunnelPath(pathPos + 0.15f);
+	pos = add(pos, scale(b, -1.5f*sinf(DemoTime*0.7f)));
+	pos = add(pos, scale(n, 1.5f*cosf(DemoTime*0.5f)));
+	LookAt(Scene.camera->getFrame(), pos, target);
+
+	// rebuild the tube
+	float ds = 0.028f;
+	float hue = DemoTime*0.03f;
+	// V texcoords must stay small: the GS wraps texel
+	// coordinates beyond ~1024, so shift out the integer part
+	float vscale = 4.0f;
+	float vbase = floorf(pathPos*vscale);
+	int i, j, v;
+
+	v = 0;
+	for(i = 0; i <= RINGS; i++){
+		float s = pathPos - ds + i*ds;
+		V3d c, tt, nn, bb;
+		pathFrame(s, &c, &tt, &nn, &bb);
+		float rad = tunnelRadius(s);
+
+		// brightness: fade out towards the far end, pulses running along
+		float fade = 1.0f - (float)i/RINGS;
+		fade = fade*fade;
+		float pulse = 0.55f + 0.45f*sinf(s*18.0f - DemoTime*6.0f);
+		float bright = fade*(0.35f + 0.65f*pulse);
+		RGBA col = HSV(hue + s*0.02f, 0.55f, bright, 255);
+
+		float twist = DemoTime*0.4f;
+		for(j = 0; j <= SIDES; j++){
+			float a = (float)j/SIDES*2.0f*3.14159265f + twist;
+			V3d p = add(c, add(scale(nn, rad*cosf(a)), scale(bb, rad*sinf(a))));
+			RWDEVICE::Im3DVertex *vert = &tunnelVerts[v++];
+			vert->setX(p.x);
+			vert->setY(p.y);
+			vert->setZ(p.z);
+			vert->setU((float)j/SIDES*4.0f);
+			vert->setV(s*vscale - vbase);
+			vert->setColor(col.red, col.green, col.blue, col.alpha);
+		}
+	}
+}
+
+static void
+TunnelRender(void)
+{
+	SetRenderState(ZTESTENABLE, 1);
+	SetRenderState(ZWRITEENABLE, 1);
+	SetRenderState(SRCBLEND, BLENDSRCALPHA);
+	SetRenderState(DESTBLEND, BLENDINVSRCALPHA);
+	SetRenderState(CULLMODE, CULLNONE);
+	SetRenderState(TEXTUREFILTER, Texture::LINEAR);
+	SetRenderStatePtr(TEXTURERASTER, gridTex ? gridTex->raster : nil);
+
+	im3d::Transform(tunnelVerts, NUMVERTS, &identMat, im3d::VERTEXUV|im3d::ALLOPAQUE);
+	im3d::RenderIndexedPrimitive(PRIMTYPETRILIST, tunnelIndices, NUMINDICES);
+	im3d::End();
+}
+
+DemoScene TunnelScene = {
+	"Tunnel",
+	TunnelInit,
+	TunnelTerm,
+	TunnelUpdate,
+	TunnelRender
+};