freedreno/a3xx+a4xx: add texture buffer object support

Basic texture buffer support.  Should be straightforward to add first/
last_element support.  And with a bit of work in ir3 emulate larger
texture buffer sizes.  But this seems to be enough for stk gl31 render
paths.

Signed-off-by: Rob Clark <robclark@freedesktop.org>

7 files changed, 41 insertions, 11 deletions

diff --git a/src/gallium/drivers/freedreno/a3xx/fd3_emit.c b/src/gallium/drivers/freedreno/a3xx/fd3_emit.c
index 49b3d97cce..752e7f88cb 100644
--- a/src/gallium/drivers/freedreno/a3xx/fd3_emit.c
+++ b/src/gallium/drivers/freedreno/a3xx/fd3_emit.c
@@ -251,14 +251,15 @@ emit_textures(struct fd_context *ctx, struct fd_ringbuffer *ring,
 				CP_LOAD_STATE_1_EXT_SRC_ADDR(0));
 		for (i = 0; i < tex->num_textures; i++) {
 			static const struct fd3_pipe_sampler_view dummy_view = {
+					.base.target = PIPE_TEXTURE_1D, /* anything !PIPE_BUFFER */
 					.base.u.tex.first_level = 1,
 			};
 			const struct fd3_pipe_sampler_view *view = tex->textures[i] ?
 					fd3_pipe_sampler_view(tex->textures[i]) :
 					&dummy_view;
 			struct fd_resource *rsc = fd_resource(view->base.texture);
-			unsigned start = view->base.u.tex.first_level;
-			unsigned end   = view->base.u.tex.last_level;
+			unsigned start = fd_sampler_first_level(&view->base);
+			unsigned end   = fd_sampler_last_level(&view->base);;
 
 			for (j = 0; j < (end - start + 1); j++) {
 				struct fd_resource_slice *slice =
@@ -341,6 +342,7 @@ fd3_emit_gmem_restore_tex(struct fd_ringbuffer *ring,
 			format = fd3_gmem_restore_format(rsc->base.b.format);
 		}
 
+		/* note: PIPE_BUFFER disallowed for surfaces */
 		unsigned lvl = psurf[i]->u.tex.level;
 		struct fd_resource_slice *slice = fd_resource_slice(rsc, lvl);
 
diff --git a/src/gallium/drivers/freedreno/a3xx/fd3_texture.c b/src/gallium/drivers/freedreno/a3xx/fd3_texture.c
index a278bf5c60..c30658d0e7 100644
--- a/src/gallium/drivers/freedreno/a3xx/fd3_texture.c
+++ b/src/gallium/drivers/freedreno/a3xx/fd3_texture.c
@@ -210,8 +210,8 @@ fd3_sampler_view_create(struct pipe_context *pctx, struct pipe_resource *prsc,
 {
 	struct fd3_pipe_sampler_view *so = CALLOC_STRUCT(fd3_pipe_sampler_view);
 	struct fd_resource *rsc = fd_resource(prsc);
-	unsigned lvl = cso->u.tex.first_level;
-	unsigned miplevels = cso->u.tex.last_level - lvl;
+	unsigned lvl = fd_sampler_first_level(cso);
+	unsigned miplevels = fd_sampler_last_level(cso) - lvl;
 	uint32_t sz2 = 0;
 
 	if (!so)
diff --git a/src/gallium/drivers/freedreno/a4xx/fd4_emit.c b/src/gallium/drivers/freedreno/a4xx/fd4_emit.c
index c3226d5121..b75be29e52 100644
--- a/src/gallium/drivers/freedreno/a4xx/fd4_emit.c
+++ b/src/gallium/drivers/freedreno/a4xx/fd4_emit.c
@@ -172,7 +172,7 @@ emit_textures(struct fd_context *ctx, struct fd_ringbuffer *ring,
 			const struct fd4_pipe_sampler_view *view = tex->textures[i] ?
 					fd4_pipe_sampler_view(tex->textures[i]) :
 					&dummy_view;
-			unsigned start = view->base.u.tex.first_level;
+			unsigned start = fd_sampler_first_level(&view->base);
 
 			OUT_RING(ring, view->texconst0);
 			OUT_RING(ring, view->texconst1);
@@ -235,6 +235,7 @@ fd4_emit_gmem_restore_tex(struct fd_ringbuffer *ring, unsigned nr_bufs,
 	for (i = 0; i < nr_bufs; i++) {
 		if (bufs[i]) {
 			struct fd_resource *rsc = fd_resource(bufs[i]->texture);
+			/* note: PIPE_BUFFER disallowed for surfaces */
 			unsigned lvl = bufs[i]->u.tex.level;
 			struct fd_resource_slice *slice = fd_resource_slice(rsc, lvl);
 			uint32_t offset = fd_resource_offset(rsc, lvl, bufs[i]->u.tex.first_layer);
diff --git a/src/gallium/drivers/freedreno/a4xx/fd4_texture.c b/src/gallium/drivers/freedreno/a4xx/fd4_texture.c
index 6ba25d0816..d2bc5fee6c 100644
--- a/src/gallium/drivers/freedreno/a4xx/fd4_texture.c
+++ b/src/gallium/drivers/freedreno/a4xx/fd4_texture.c
@@ -150,8 +150,8 @@ fd4_sampler_view_create(struct pipe_context *pctx, struct pipe_resource *prsc,
 {
 	struct fd4_pipe_sampler_view *so = CALLOC_STRUCT(fd4_pipe_sampler_view);
 	struct fd_resource *rsc = fd_resource(prsc);
-	unsigned lvl = cso->u.tex.first_level;
-	unsigned miplevels = cso->u.tex.last_level - lvl;
+	unsigned lvl = fd_sampler_first_level(cso);
+	unsigned miplevels = fd_sampler_last_level(cso) - lvl;
 
 	if (!so)
 		return NULL;
diff --git a/src/gallium/drivers/freedreno/freedreno_screen.c b/src/gallium/drivers/freedreno/freedreno_screen.c
index 26802b0188..3aeed57b04 100644
--- a/src/gallium/drivers/freedreno/freedreno_screen.c
+++ b/src/gallium/drivers/freedreno/freedreno_screen.c
@@ -164,9 +164,6 @@ fd_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 	case PIPE_CAP_TEXTURE_BARRIER:
 	case PIPE_CAP_TEXTURE_MIRROR_CLAMP:
 	case PIPE_CAP_CUBE_MAP_ARRAY:
-	case PIPE_CAP_TEXTURE_BUFFER_OBJECTS:
-	case PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT:
-	case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
 	case PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS:
 	case PIPE_CAP_START_INSTANCE:
 	case PIPE_CAP_COMPUTE:
@@ -178,8 +175,21 @@ fd_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 	case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
 	case PIPE_CAP_INDEP_BLEND_ENABLE:
 	case PIPE_CAP_INDEP_BLEND_FUNC:
+	case PIPE_CAP_TEXTURE_BUFFER_OBJECTS:
 		return is_a3xx(screen) || is_a4xx(screen);
 
+	case PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT:
+		/* ignoring first/last_element.. but I guess that should be
+		 * easy to add..
+		 */
+		return 0;
+	case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
+		/* I think 32k on a4xx.. and we could possibly emulate more
+		 * by pretending 2d/rect textures and splitting high bits
+		 * of index into 2nd dimension..
+		 */
+		return 16383;
+
 	case PIPE_CAP_DEPTH_CLIP_DISABLE:
 		return is_a3xx(screen);
 
diff --git a/src/gallium/drivers/freedreno/freedreno_surface.c b/src/gallium/drivers/freedreno/freedreno_surface.c
index 250fe4bc0f..70c44eb79c 100644
--- a/src/gallium/drivers/freedreno/freedreno_surface.c
+++ b/src/gallium/drivers/freedreno/freedreno_surface.c
@@ -41,7 +41,8 @@ fd_create_surface(struct pipe_context *pctx,
 //	struct fd_resource* tex = fd_resource(ptex);
 	struct fd_surface* surface = CALLOC_STRUCT(fd_surface);
 
-	assert(surf_tmpl->u.tex.first_layer == surf_tmpl->u.tex.last_layer);
+	debug_assert(ptex->target != PIPE_BUFFER);
+	debug_assert(surf_tmpl->u.tex.first_layer == surf_tmpl->u.tex.last_layer);
 
 	if (surface) {
 		struct pipe_surface *psurf = &surface->base;
diff --git a/src/gallium/drivers/freedreno/freedreno_util.h b/src/gallium/drivers/freedreno/freedreno_util.h
index d6a08b5fa1..7129a1bddd 100644
--- a/src/gallium/drivers/freedreno/freedreno_util.h
+++ b/src/gallium/drivers/freedreno/freedreno_util.h
@@ -140,6 +140,22 @@ fd_surface_half_precision(const struct pipe_surface *psurf)
 	return true;
 }
 
+static inline unsigned
+fd_sampler_first_level(const struct pipe_sampler_view *view)
+{
+	if (view->target == PIPE_BUFFER)
+		return 0;
+	return view->u.tex.first_level;
+}
+
+static inline unsigned
+fd_sampler_last_level(const struct pipe_sampler_view *view)
+{
+	if (view->target == PIPE_BUFFER)
+		return 0;
+	return view->u.tex.last_level;
+}
+
 static inline bool
 fd_half_precision(struct pipe_framebuffer_state *pfb)
 {