added simple demoreel and ps2 skeleton coded by claude fable 5

tools/demoreel/scene_particles.cpp

@@ -0,0 +1,165 @@
+#include <math.h>
+
+#include "demoreel.h"
+
+// Additive-blended particle vortex, camera-facing quads via im3d.
+// The kind of thing the GS fillrate was made for.
+
+using namespace rw;
+
+#ifdef RW_PS2
+#define NUMPARTS 600
+#else
+#define NUMPARTS 1200
+#endif
+
+struct Particle
+{
+	float angle;
+	float radius;
+	float height;
+	float size;
+	float phase;
+};
+
+static Particle parts[NUMPARTS];
+static RWDEVICE::Im3DVertex partVerts[NUMPARTS*4];
+static uint16 partIndices[NUMPARTS*6];
+static Texture *glowTex;
+static Matrix identMat;
+
+// cheap deterministic pseudo-random, no libc rand()
+static float
+frand(int n)
+{
+	n = (n<<13) ^ n;
+	n = n*(n*n*15731 + 789221) + 1376312589;
+	return ((n & 0x7fffffff) / (float)0x7fffffff);
+}
+
+static void
+ParticleInit(void)
+{
+	int i;
+
+	glowTex = MakeGlowTexture();
+	identMat.setIdentity();
+
+	for(i = 0; i < NUMPARTS; i++){
+		Particle *p = &parts[i];
+		float u = (float)i/NUMPARTS;
+		p->radius = 4.0f + 30.0f*powf(u, 0.7f);
+		p->angle = i*2.3999632f + frand(i)*0.6f;	// golden angle spiral
+		p->height = (frand(i*3+1) - 0.5f)*10.0f*expf(-p->radius/18.0f);
+		p->size = 0.5f + frand(i*7+2)*1.1f;
+		p->phase = frand(i*13+3)*6.28f;
+	}
+
+	for(i = 0; i < NUMPARTS; i++){
+		partIndices[i*6+0] = i*4+0;
+		partIndices[i*6+1] = i*4+1;
+		partIndices[i*6+2] = i*4+2;
+		partIndices[i*6+3] = i*4+0;
+		partIndices[i*6+4] = i*4+2;
+		partIndices[i*6+5] = i*4+3;
+	}
+}
+
+static void
+ParticleTerm(void)
+{
+	if(glowTex){
+		glowTex->destroy();
+		glowTex = nil;
+	}
+}
+
+static void
+ParticleUpdate(float dt)
+{
+	int i;
+
+	// differential rotation: inner particles spin faster
+	for(i = 0; i < NUMPARTS; i++){
+		Particle *p = &parts[i];
+		p->angle += dt*16.0f/(p->radius + 4.0f);
+	}
+
+	// slow orbiting camera
+	float ca = DemoTime*0.12f;
+	V3d campos;
+	campos.x = 55.0f*cosf(ca);
+	campos.y = 55.0f*sinf(ca);
+	campos.z = 14.0f + 10.0f*sinf(DemoTime*0.2f);
+	V3d origin = { 0.0f, 0.0f, 0.0f };
+	LookAt(Scene.camera->getFrame(), campos, origin);
+
+	// billboard the quads using the camera axes
+	Matrix *cm = Scene.camera->getFrame()->getLTM();
+	V3d right = cm->right;
+	V3d up = cm->up;
+
+	for(i = 0; i < NUMPARTS; i++){
+		Particle *p = &parts[i];
+		V3d pos;
+		pos.x = p->radius*cosf(p->angle);
+		pos.y = p->radius*sinf(p->angle);
+		pos.z = p->height + 0.8f*sinf(DemoTime*2.0f + p->phase);
+
+		float tw = 0.7f + 0.3f*sinf(DemoTime*5.0f + p->phase);
+		float sz = p->size*tw;
+		RGBA col = HSV(DemoTime*0.02f + p->radius*0.012f, 0.8f, tw, 255);
+
+		RWDEVICE::Im3DVertex *v = &partVerts[i*4];
+		V3d r = scale(right, sz);
+		V3d u = scale(up, sz);
+		V3d pu = add(pos, u);
+		V3d pd = sub(pos, u);
+		V3d c;
+
+		c = sub(pu, r);
+		v[0].setX(c.x); v[0].setY(c.y); v[0].setZ(c.z);
+		v[0].setU(0.0f); v[0].setV(0.0f);
+		c = add(pu, r);
+		v[1].setX(c.x); v[1].setY(c.y); v[1].setZ(c.z);
+		v[1].setU(1.0f); v[1].setV(0.0f);
+		c = add(pd, r);
+		v[2].setX(c.x); v[2].setY(c.y); v[2].setZ(c.z);
+		v[2].setU(1.0f); v[2].setV(1.0f);
+		c = sub(pd, r);
+		v[3].setX(c.x); v[3].setY(c.y); v[3].setZ(c.z);
+		v[3].setU(0.0f); v[3].setV(1.0f);
+
+		int j;
+		for(j = 0; j < 4; j++)
+			v[j].setColor(col.red, col.green, col.blue, col.alpha);
+	}
+}
+
+static void
+ParticleRender(void)
+{
+	SetRenderState(ZTESTENABLE, 1);
+	SetRenderState(ZWRITEENABLE, 0);
+	SetRenderState(SRCBLEND, BLENDONE);
+	SetRenderState(DESTBLEND, BLENDONE);
+	SetRenderState(CULLMODE, CULLNONE);
+	SetRenderState(TEXTUREFILTER, Texture::LINEAR);
+	SetRenderStatePtr(TEXTURERASTER, glowTex ? glowTex->raster : nil);
+
+	im3d::Transform(partVerts, NUMPARTS*4, &identMat, im3d::VERTEXUV);
+	im3d::RenderIndexedPrimitive(PRIMTYPETRILIST, partIndices, NUMPARTS*6);
+	im3d::End();
+
+	SetRenderState(ZWRITEENABLE, 1);
+	SetRenderState(SRCBLEND, BLENDSRCALPHA);
+	SetRenderState(DESTBLEND, BLENDINVSRCALPHA);
+}
+
+DemoScene ParticleScene = {
+	"Particle vortex",
+	ParticleInit,
+	ParticleTerm,
+	ParticleUpdate,
+	ParticleRender
+};