From d3b48593b0fee862ea60687336031fd9374ab667 Mon Sep 17 00:00:00 2001
From: rodri <rgl@antares-labs.eu>
Date: Sat, 10 Aug 2024 17:57:02 +0000
Subject: experimental A-buffer implementation.

very simple, without anti-aliasing, made for getting
OIT (order independent transparency) rendering of
arbitrary objects.

also added switches for blending, depth testing and the
A-buffer to the camera.
---
 graphics.h | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

(limited to 'graphics.h')

diff --git a/graphics.h b/graphics.h
index 4aa18f1..c9a7f67 100644
--- a/graphics.h
+++ b/graphics.h
@@ -54,6 +54,9 @@ typedef struct Shadertab Shadertab;
 typedef struct Renderer Renderer;
 typedef struct Rendertime Rendertime;
 typedef struct Renderjob Renderjob;
+typedef struct Fragment Fragment;
+typedef struct Astk Astk;
+typedef struct Abuf Abuf;
 typedef struct Framebuf Framebuf;
 typedef struct Framebufctl Framebufctl;
 typedef struct Viewport Viewport;
@@ -246,11 +249,34 @@ struct Renderjob
 	Renderjob *next;
 };
 
+struct Fragment
+{
+	Color c;
+	float z;
+};
+
+struct Astk
+{
+	Point p;
+	Fragment *items;
+	ulong size;
+	int active;
+};
+
+struct Abuf
+{
+	QLock;
+	Astk *stk;	/* framebuffer fragment stacks */
+	Astk **act;	/* active fragment stacks */
+	ulong nact;
+};
+
 struct Framebuf
 {
 	ulong *cb;	/* color buffer */
 	float *zb;	/* z/depth buffer */
 	ulong *nb;	/* normals buffer (DBG only) */
+	Abuf abuf;	/* A-buffer */
 	Rectangle r;
 };
 
@@ -300,6 +326,9 @@ struct Camera
 	Matrix3 proj;		/* VCS to clip space xform */
 	Projection projtype;
 	int cullmode;
+	int enableblend;
+	int enabledepth;
+	int enableAbuff;
 
 	struct {
 		uvlong min, avg, max, acc, n, v;
-- 
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