nv50: implement depth clamp

src/gallium/drivers/nv50/nv50_context.h

@@ -50,6 +50,7 @@
 #define NV50_NEW_SAMPLER	(1 << 15)
 #define NV50_NEW_TEXTURE	(1 << 16)
 #define NV50_NEW_STENCIL_REF	(1 << 17)
+#define NV50_NEW_CLIP		(1 << 18)
 
 struct nv50_blend_stateobj {
 	struct pipe_blend_state pipe;
@@ -140,6 +141,7 @@ struct nv50_context {
 	struct pipe_scissor_state scissor;
 	struct pipe_viewport_state viewport;
 	struct pipe_framebuffer_state framebuffer;
+	struct pipe_clip_state clip;
 	struct nv50_program *vertprog;
 	struct nv50_program *fragprog;
 	struct nv50_program *geomprog;

src/gallium/drivers/nv50/nv50_screen.c

@@ -186,6 +186,8 @@ nv50_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 	case PIPE_CAP_MAX_VS_TEMPS:
 	case PIPE_CAP_MAX_FS_TEMPS: /* no spilling atm */
 		return 128 / 4;
+	case PIPE_CAP_DEPTH_CLAMP:
+		return 1;
 	default:
 		NOUVEAU_ERR("Unknown PIPE_CAP %d\n", param);
 		return 0;
@@ -525,6 +527,9 @@ nv50_screen_create(struct pipe_winsys *ws, struct nouveau_device *dev)
 	OUT_RINGf (chan, 0.0f);
 	OUT_RINGf (chan, 1.0f);
 
+	BEGIN_RING(chan, screen->tesla, NV50TCL_VIEWPORT_TRANSFORM_EN, 1);
+	OUT_RING  (chan, 1);
+
 	/* no dynamic combination of TIC & TSC entries => only BIND_TIC used */
 	BEGIN_RING(chan, screen->tesla, NV50TCL_LINKED_TSC, 1);
 	OUT_RING  (chan, 1);

src/gallium/drivers/nv50/nv50_state.c

@@ -658,6 +658,10 @@ static void
 nv50_set_clip_state(struct pipe_context *pipe,
 		    const struct pipe_clip_state *clip)
 {
+	struct nv50_context *nv50 = nv50_context(pipe);
+
+	nv50->clip.depth_clamp = clip->depth_clamp;
+	nv50->dirty |= NV50_NEW_CLIP;
 }
 
 static void

src/gallium/drivers/nv50/nv50_state_validate.c

@@ -277,7 +277,7 @@ static struct nouveau_stateobj *
 validate_viewport(struct nv50_context *nv50)
 {
 	struct nouveau_grobj *tesla = nv50->screen->tesla;
-	struct nouveau_stateobj *so = so_new(5, 9, 0);
+	struct nouveau_stateobj *so = so_new(3, 7, 0);
 
 	so_method(so, tesla, NV50TCL_VIEWPORT_TRANSLATE_X(0), 3);
 	so_data  (so, fui(nv50->viewport.translate[0]));
@@ -288,15 +288,6 @@ validate_viewport(struct nv50_context *nv50)
 	so_data  (so, fui(nv50->viewport.scale[1]));
 	so_data  (so, fui(nv50->viewport.scale[2]));
 
-	so_method(so, tesla, NV50TCL_VIEWPORT_TRANSFORM_EN, 1);
-	so_data  (so, 1);
-	/* 0x0000 = remove whole primitive only (xyz)
-	 * 0x1018 = remove whole primitive only (xy), clamp z
-	 * 0x1080 = clip primitive (xyz)
-	 * 0x1098 = clip primitive (xy), clamp z
-	 */
-	so_method(so, tesla, NV50TCL_VIEW_VOLUME_CLIP_CTRL, 1);
-	so_data  (so, 0x1080);
 	/* no idea what 0f90 does */
 	so_method(so, tesla, 0x0f90, 1);
 	so_data  (so, 0);
@@ -341,6 +332,26 @@ validate_vtxattr(struct nv50_context *nv50)
 	return so;
 }
 
+static struct nouveau_stateobj *
+validate_clip(struct nv50_context *nv50)
+{
+	struct nouveau_grobj *tesla = nv50->screen->tesla;
+	struct nouveau_stateobj *so = so_new(1, 1, 0);
+	uint32_t vvcc;
+
+	/* 0x0000 = remove whole primitive only (xyz)
+	 * 0x1018 = remove whole primitive only (xy), clamp z
+	 * 0x1080 = clip primitive (xyz)
+	 * 0x1098 = clip primitive (xy), clamp z
+	 */
+	vvcc = nv50->clip.depth_clamp ? 0x1098 : 0x1080;
+
+	so_method(so, tesla, NV50TCL_VIEW_VOLUME_CLIP_CTRL, 1);
+	so_data  (so, vvcc);
+
+	return so;
+}
+
 struct state_validate {
 	struct nouveau_stateobj *(*func)(struct nv50_context *nv50);
 	unsigned states;
@@ -365,6 +376,7 @@ struct state_validate {
 	{ nv50_vbo_validate       , NV50_NEW_ARRAYS                           },
 	{ validate_vtxbuf         , NV50_NEW_ARRAYS                           },
 	{ validate_vtxattr        , NV50_NEW_ARRAYS                           },
+	{ validate_clip           , NV50_NEW_CLIP                             },
 	{}
 };
 #define validate_list_len (sizeof(validate_list) / sizeof(validate_list[0]))