From eeda874d7c96703668d8ea9da2a4d22299ae4e5f Mon Sep 17 00:00:00 2001
From: rodri <rgl@antares-labs.eu>
Date: Fri, 13 Sep 2024 14:29:57 +0000
Subject: turn the camera rendering options into a bitmap.

---
 camera.c   |  2 +-
 graphics.h | 11 +++++++----
 render.c   | 33 ++++++++++++++++++---------------
 3 files changed, 26 insertions(+), 20 deletions(-)

diff --git a/camera.c b/camera.c
index 2f7daf7..9e5d264 100644
--- a/camera.c
+++ b/camera.c
@@ -118,7 +118,7 @@ newcamera(void)
 
 	c = emalloc(sizeof *c);
 	memset(c, 0, sizeof *c);
-	c->enabledepth = 1;
+	c->rendopts = RODepth;
 	return c;
 }
 
diff --git a/graphics.h b/graphics.h
index 39af008..bc18069 100644
--- a/graphics.h
+++ b/graphics.h
@@ -13,6 +13,11 @@ enum {
 	CullFront,
 	CullBack,
 
+	/* render options */
+	ROBlend	= 0x01,
+	RODepth	= 0x02,
+	ROAbuff	= 0x04,
+
 	/* primitive types */
 	PPoint = 0,
 	PLine,
@@ -27,7 +32,7 @@ enum {
 	COLOR32 = 0,	/* RGBA32 */
 	FLOAT32,	/* F32 */
 
-	/* texture formats */
+	/* texture types */
 	RAWTexture = 0,	/* unmanaged */
 	sRGBTexture,
 
@@ -351,9 +356,7 @@ struct Camera
 	Matrix3 proj;		/* VCS to clip space xform */
 	Projection projtype;
 	int cullmode;
-	int enableblend;
-	int enabledepth;
-	int enableAbuff;
+	uint rendopts;
 
 	struct {
 		uvlong min, avg, max, acc, n, v;
diff --git a/render.c b/render.c
index 52328ab..4f79cc2 100644
--- a/render.c
+++ b/render.c
@@ -175,6 +175,7 @@ rasterize(Rastertask *task)
 	Color c;
 	double dplen, perc;
 	float z, pcz;
+	uint ropts;
 	int steep = 0, Δe, e, Δy;
 
 	params = task->params;
@@ -191,12 +192,14 @@ rasterize(Rastertask *task)
 	cr = params->fb->rasters;
 	zr = cr->next;
 
+	ropts = params->camera->rendopts;
+
 	switch(prim->type){
 	case PPoint:
 		p = Pt(prim->v[0].p.x, prim->v[0].p.y);
 
 		z = fclamp(prim->v[0].p.z, 0, 1);
-		if(params->camera->enabledepth && z <= getdepth(zr, p))
+		if((ropts & RODepth) && z <= getdepth(zr, p))
 			break;
 
 		fsp.v = &prim->v[0];
@@ -204,12 +207,12 @@ rasterize(Rastertask *task)
 		c = params->fshader(&fsp);
 		if(c.a == 0)			/* discard non-colors */
 			break;
-		if(params->camera->enabledepth)
+		if(ropts & RODepth)
 			putdepth(zr, p, z);
-		if(params->camera->enableAbuff)
+		if(ropts & ROAbuff)
 			pushtoAbuf(params->fb, p, c, z);
 		else
-			pixel(cr, p, c, params->camera->enableblend);
+			pixel(cr, p, c, ropts & ROBlend);
 		delvattrs(fsp.v);
 		break;
 	case PLine:
@@ -246,7 +249,7 @@ rasterize(Rastertask *task)
 
 			z = flerp(prim->v[0].p.z, prim->v[1].p.z, perc);
 			/* TODO get rid of the bounds check and make sure the clipping doesn't overflow */
-			if(params->camera->enabledepth &&
+			if((ropts & RODepth) &&
 			   !ptinrect(p, params->fb->r) || z <= getdepth(zr, p))
 				goto discard;
 
@@ -262,12 +265,12 @@ rasterize(Rastertask *task)
 			c = params->fshader(&fsp);
 			if(c.a == 0)			/* discard non-colors */
 				goto discard;
-			if(params->camera->enabledepth)
+			if(ropts & RODepth)
 				putdepth(zr, p, z);
-			if(params->camera->enableAbuff)
+			if(ropts & ROAbuff)
 				pushtoAbuf(params->fb, p, c, z);
 			else
-				pixel(cr, p, c, params->camera->enableblend);
+				pixel(cr, p, c, ropts & ROBlend);
 discard:
 			if(steep) SWAP(int, &p.x, &p.y);
 
@@ -291,7 +294,7 @@ discard:
 				continue;
 
 			z = fberp(prim->v[0].p.z, prim->v[1].p.z, prim->v[2].p.z, bc);
-			if(params->camera->enabledepth && z <= getdepth(zr, p))
+			if((ropts & RODepth) && z <= getdepth(zr, p))
 				continue;
 
 			/* interpolate z⁻¹ and get actual z */
@@ -308,12 +311,12 @@ discard:
 			c = params->fshader(&fsp);
 			if(c.a == 0)			/* discard non-colors */
 				continue;
-			if(params->camera->enabledepth)
+			if(ropts & RODepth)
 				putdepth(zr, p, z);
-			if(params->camera->enableAbuff)
+			if(ropts & ROAbuff)
 				pushtoAbuf(params->fb, p, c, z);
 			else
-				pixel(cr, p, c, params->camera->enableblend);
+				pixel(cr, p, c, ropts & ROBlend);
 		}
 		delvattrs(fsp.v);
 		break;
@@ -345,8 +348,8 @@ rasterizer(void *arg)
 		/* end of job */
 		if(params->entity == nil){
 			if(decref(job) < 1){
-				if(job->camera->enableAbuff)
-					squashAbuf(job->fb, job->camera->enableblend);
+				if(job->camera->rendopts & ROAbuff)
+					squashAbuf(job->fb, job->camera->rendopts & ROBlend);
 				if(job->rctl->doprof)
 					job->times.Rn[rp->id].t1 = nanosec();
 				nbsend(job->donec, nil);
@@ -690,7 +693,7 @@ renderer(void *arg)
 		}
 
 		/* initialize the A-buffer */
-		if(job->camera->enableAbuff && job->fb->abuf.stk == nil){
+		if((job->camera->rendopts & ROAbuff) && job->fb->abuf.stk == nil){
 			job->fb->abuf.stk = emalloc(Dx(job->fb->r)*Dy(job->fb->r)*sizeof(Astk));
 			memset(job->fb->abuf.stk, 0, Dx(job->fb->r)*Dy(job->fb->r)*sizeof(Astk));
 		}
-- 
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