gallium/st: add pipe_context::generate_mipmap()

This patch adds a new interface to support hardware mipmap generation.
PIPE_CAP_GENERATE_MIPMAP is added to allow a driver to specify
if this new interface is supported; if not supported, the state tracker will
fallback to mipmap generation by rendering/texturing.

v2: add PIPE_CAP_GENERATE_MIPMAP to the disabled section for all drivers
v3: add format to the generate_mipmap interface to allow mipmap generation
    using a format other than the resource format
v4: fix return type of trace_context_generate_mipmap()

Reviewed-by: Brian Paul <[email protected]>
Reviewed-by: Roland Scheidegger <[email protected]>
Reviewed-by: Jose Fonseca <[email protected]>

20 files changed, 89 insertions, 5 deletions

diff --git a/src/gallium/docs/source/context.rst b/src/gallium/docs/source/context.rst
index 9a32716f921..4c03e00008c 100644
--- a/src/gallium/docs/source/context.rst
+++ b/src/gallium/docs/source/context.rst
@@ -648,3 +648,14 @@ In addition, normal texture sampling is allowed from the compute
 program: ``bind_sampler_states`` may be used to set up texture
 samplers for the compute stage and ``set_sampler_views`` may
 be used to bind a number of sampler views to it.
+
+Mipmap generation
+^^^^^^^^^^^^^^^^^
+
+If PIPE_CAP_GENERATE_MIPMAP is true, ``generate_mipmap`` can be used
+to generate mipmaps for the specified texture resource.
+It replaces texel image levels base_level+1 through
+last_level for layers range from first_layer through last_layer.
+It returns TRUE if mipmap generation succeeds, otherwise it
+returns FALSE. Mipmap generation may fail when it is not supported
+for particular texture types or formats.
diff --git a/src/gallium/docs/source/screen.rst b/src/gallium/docs/source/screen.rst
index 81de7f85708..d7ea123b0e9 100644
--- a/src/gallium/docs/source/screen.rst
+++ b/src/gallium/docs/source/screen.rst
@@ -303,6 +303,8 @@ The integer capabilities:
   shader buffers are not supported.
 * ``PIPE_CAP_INVALIDATE_BUFFER``: Whether the use of ``invalidate_resource``
   for buffers is supported.
+* ``PIPE_CAP_GENERATE_MIPMAP``: Indicates whether pipe_context::generate_mipmap
+  is supported.
 
 
 .. _pipe_capf:
diff --git a/src/gallium/drivers/freedreno/freedreno_screen.c b/src/gallium/drivers/freedreno/freedreno_screen.c
index 70af0385111..a75b04b327a 100644
--- a/src/gallium/drivers/freedreno/freedreno_screen.c
+++ b/src/gallium/drivers/freedreno/freedreno_screen.c
@@ -246,6 +246,7 @@ fd_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 	case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
 	case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
 	case PIPE_CAP_INVALIDATE_BUFFER:
+	case PIPE_CAP_GENERATE_MIPMAP:
 		return 0;
 
 	case PIPE_CAP_MAX_VIEWPORTS:
diff --git a/src/gallium/drivers/i915/i915_screen.c b/src/gallium/drivers/i915/i915_screen.c
index fa3e8163273..ede5558a11e 100644
--- a/src/gallium/drivers/i915/i915_screen.c
+++ b/src/gallium/drivers/i915/i915_screen.c
@@ -260,6 +260,7 @@ i915_get_param(struct pipe_screen *screen, enum pipe_cap cap)
    case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
    case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
    case PIPE_CAP_INVALIDATE_BUFFER:
+   case PIPE_CAP_GENERATE_MIPMAP:
       return 0;
 
    case PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS:
diff --git a/src/gallium/drivers/ilo/ilo_screen.c b/src/gallium/drivers/ilo/ilo_screen.c
index 0306542fac0..fa327571b9b 100644
--- a/src/gallium/drivers/ilo/ilo_screen.c
+++ b/src/gallium/drivers/ilo/ilo_screen.c
@@ -484,6 +484,7 @@ ilo_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
    case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
    case PIPE_CAP_INVALIDATE_BUFFER:
+   case PIPE_CAP_GENERATE_MIPMAP:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:
diff --git a/src/gallium/drivers/llvmpipe/lp_screen.c b/src/gallium/drivers/llvmpipe/lp_screen.c
index eadbbb31d19..fb52f5dc063 100644
--- a/src/gallium/drivers/llvmpipe/lp_screen.c
+++ b/src/gallium/drivers/llvmpipe/lp_screen.c
@@ -309,6 +309,7 @@ llvmpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
    case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
    case PIPE_CAP_INVALIDATE_BUFFER:
+   case PIPE_CAP_GENERATE_MIPMAP:
       return 0;
    }
    /* should only get here on unhandled cases */
diff --git a/src/gallium/drivers/nouveau/nv30/nv30_screen.c b/src/gallium/drivers/nouveau/nv30/nv30_screen.c
index 421bf655590..933330f107a 100644
--- a/src/gallium/drivers/nouveau/nv30/nv30_screen.c
+++ b/src/gallium/drivers/nouveau/nv30/nv30_screen.c
@@ -182,6 +182,7 @@ nv30_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
    case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
    case PIPE_CAP_INVALIDATE_BUFFER:
+   case PIPE_CAP_GENERATE_MIPMAP:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:
diff --git a/src/gallium/drivers/nouveau/nv50/nv50_screen.c b/src/gallium/drivers/nouveau/nv50/nv50_screen.c
index 2b7f928b15a..712835c1ce1 100644
--- a/src/gallium/drivers/nouveau/nv50/nv50_screen.c
+++ b/src/gallium/drivers/nouveau/nv50/nv50_screen.c
@@ -225,6 +225,7 @@ nv50_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL:
    case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
    case PIPE_CAP_INVALIDATE_BUFFER:
+   case PIPE_CAP_GENERATE_MIPMAP:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:
diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
index cd8e950e2ba..ccf96fb2815 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
@@ -214,6 +214,7 @@ nvc0_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL:
    case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
    case PIPE_CAP_INVALIDATE_BUFFER:
+   case PIPE_CAP_GENERATE_MIPMAP:
       return 0;
 
    case PIPE_CAP_VENDOR_ID:
diff --git a/src/gallium/drivers/r300/r300_screen.c b/src/gallium/drivers/r300/r300_screen.c
index a0afef7d80f..8823b8d3197 100644
--- a/src/gallium/drivers/r300/r300_screen.c
+++ b/src/gallium/drivers/r300/r300_screen.c
@@ -208,6 +208,7 @@ static int r300_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
         case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
         case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
         case PIPE_CAP_INVALIDATE_BUFFER:
+        case PIPE_CAP_GENERATE_MIPMAP:
             return 0;
 
         /* SWTCL-only features. */
diff --git a/src/gallium/drivers/r600/r600_pipe.c b/src/gallium/drivers/r600/r600_pipe.c
index 569f77c2b85..08fdd361049 100644
--- a/src/gallium/drivers/r600/r600_pipe.c
+++ b/src/gallium/drivers/r600/r600_pipe.c
@@ -356,6 +356,7 @@ static int r600_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL:
 	case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
 	case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
+	case PIPE_CAP_GENERATE_MIPMAP:
 		return 0;
 
 	case PIPE_CAP_MAX_SHADER_PATCH_VARYINGS:
diff --git a/src/gallium/drivers/radeonsi/si_pipe.c b/src/gallium/drivers/radeonsi/si_pipe.c
index cb80a72f94b..f6ff4a81bd4 100644
--- a/src/gallium/drivers/radeonsi/si_pipe.c
+++ b/src/gallium/drivers/radeonsi/si_pipe.c
@@ -348,6 +348,7 @@ static int si_get_param(struct pipe_screen* pscreen, enum pipe_cap param)
 	case PIPE_CAP_MULTI_DRAW_INDIRECT:
 	case PIPE_CAP_MULTI_DRAW_INDIRECT_PARAMS:
 	case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
+	case PIPE_CAP_GENERATE_MIPMAP:
 		return 0;
 
 	case PIPE_CAP_MAX_SHADER_PATCH_VARYINGS:
diff --git a/src/gallium/drivers/softpipe/sp_screen.c b/src/gallium/drivers/softpipe/sp_screen.c
index f2d1dee58d9..143702a5650 100644
--- a/src/gallium/drivers/softpipe/sp_screen.c
+++ b/src/gallium/drivers/softpipe/sp_screen.c
@@ -259,6 +259,7 @@ softpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
    case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
    case PIPE_CAP_INVALIDATE_BUFFER:
+   case PIPE_CAP_GENERATE_MIPMAP:
       return 0;
    }
    /* should only get here on unhandled cases */
diff --git a/src/gallium/drivers/svga/svga_screen.c b/src/gallium/drivers/svga/svga_screen.c
index b506019cb5e..0528d8df833 100644
--- a/src/gallium/drivers/svga/svga_screen.c
+++ b/src/gallium/drivers/svga/svga_screen.c
@@ -392,6 +392,7 @@ svga_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_DRAW_PARAMETERS:
    case PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL:
    case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
+   case PIPE_CAP_GENERATE_MIPMAP:
       return 0;
    }
 
diff --git a/src/gallium/drivers/trace/tr_context.c b/src/gallium/drivers/trace/tr_context.c
index d4c88c9be6d..b5ab9249835 100644
--- a/src/gallium/drivers/trace/tr_context.c
+++ b/src/gallium/drivers/trace/tr_context.c
@@ -1291,6 +1291,42 @@ trace_context_flush(struct pipe_context *_pipe,
 }
 
 
+static inline boolean
+trace_context_generate_mipmap(struct pipe_context *_pipe,
+                              struct pipe_resource *res,
+                              enum pipe_format format,
+                              unsigned base_level,
+                              unsigned last_level,
+                              unsigned first_layer,
+                              unsigned last_layer)
+{
+   struct trace_context *tr_ctx = trace_context(_pipe);
+   struct pipe_context *pipe = tr_ctx->pipe;
+   boolean ret;
+
+   res = trace_resource_unwrap(tr_ctx, res);
+
+   trace_dump_call_begin("pipe_context", "generate_mipmap");
+
+   trace_dump_arg(ptr, pipe);
+   trace_dump_arg(ptr, res);
+
+   trace_dump_arg(format, format);
+   trace_dump_arg(uint, base_level);
+   trace_dump_arg(uint, last_level);
+   trace_dump_arg(uint, first_layer);
+   trace_dump_arg(uint, last_layer);
+
+   ret = pipe->generate_mipmap(pipe, res, format, base_level, last_level,
+                               first_layer, last_layer);
+
+   trace_dump_ret(bool, ret);
+   trace_dump_call_end();
+
+   return ret;
+}
+
+
 static inline void
 trace_context_destroy(struct pipe_context *_pipe)
 {
@@ -1620,6 +1656,7 @@ trace_context_create(struct trace_screen *tr_scr,
    TR_CTX_INIT(clear_render_target);
    TR_CTX_INIT(clear_depth_stencil);
    TR_CTX_INIT(flush);
+   TR_CTX_INIT(generate_mipmap);
    TR_CTX_INIT(texture_barrier);
    TR_CTX_INIT(memory_barrier);
    TR_CTX_INIT(set_tess_state);
diff --git a/src/gallium/drivers/vc4/vc4_screen.c b/src/gallium/drivers/vc4/vc4_screen.c
index 5a9483797a9..fb41877017d 100644
--- a/src/gallium/drivers/vc4/vc4_screen.c
+++ b/src/gallium/drivers/vc4/vc4_screen.c
@@ -197,6 +197,7 @@ vc4_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
         case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
         case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
         case PIPE_CAP_INVALIDATE_BUFFER:
+        case PIPE_CAP_GENERATE_MIPMAP:
                 return 0;
 
                 /* Stream output. */
diff --git a/src/gallium/drivers/virgl/virgl_screen.c b/src/gallium/drivers/virgl/virgl_screen.c
index 63af8dd6419..fb2e5670ef0 100644
--- a/src/gallium/drivers/virgl/virgl_screen.c
+++ b/src/gallium/drivers/virgl/virgl_screen.c
@@ -227,6 +227,7 @@ virgl_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
    case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
    case PIPE_CAP_INVALIDATE_BUFFER:
+   case PIPE_CAP_GENERATE_MIPMAP:
       return 0;
    case PIPE_CAP_VENDOR_ID:
       return 0x1af4;
diff --git a/src/gallium/include/pipe/p_context.h b/src/gallium/include/pipe/p_context.h
index 78155c05348..4b551ed0b41 100644
--- a/src/gallium/include/pipe/p_context.h
+++ b/src/gallium/include/pipe/p_context.h
@@ -677,6 +677,18 @@ struct pipe_context {
     */
    void (*dump_debug_state)(struct pipe_context *ctx, FILE *stream,
                             unsigned flags);
+
+   /**
+    * Generate mipmap.
+    * \return TRUE if mipmap generation succeeds, FALSE otherwise
+    */
+   boolean (*generate_mipmap)(struct pipe_context *ctx,
+                              struct pipe_resource *resource,
+                              enum pipe_format format,
+                              unsigned base_level,
+                              unsigned last_level,
+                              unsigned first_layer,
+                              unsigned last_layer);
 };
 
 
diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h
index 0655f080e42..cb837cd2597 100644
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -643,6 +643,7 @@ enum pipe_cap
    PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL,
    PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT,
    PIPE_CAP_INVALIDATE_BUFFER,
+   PIPE_CAP_GENERATE_MIPMAP,
 };
 
 #define PIPE_QUIRK_TEXTURE_BORDER_COLOR_SWIZZLE_NV50 (1 << 0)
diff --git a/src/mesa/state_tracker/st_gen_mipmap.c b/src/mesa/state_tracker/st_gen_mipmap.c
index b3700406df0..3e6c0a73bc7 100644
--- a/src/mesa/state_tracker/st_gen_mipmap.c
+++ b/src/mesa/state_tracker/st_gen_mipmap.c
@@ -149,12 +149,19 @@ st_generate_mipmap(struct gl_context *ctx, GLenum target,
       last_layer = util_max_layer(pt, baseLevel);
    }
 
-   /* Try to generate the mipmap by rendering/texturing.  If that fails,
-    * use the software fallback.
+   /* First see if the driver supports hardware mipmap generation,
+    * if not then generate the mipmap by rendering/texturing.
+    * If that fails, use the software fallback.
     */
-   if (!util_gen_mipmap(st->pipe, pt, pt->format, baseLevel, lastLevel,
-                        first_layer, last_layer, PIPE_TEX_FILTER_LINEAR)) {
-      _mesa_generate_mipmap(ctx, target, texObj);
+   if (!st->pipe->screen->get_param(st->pipe->screen,
+                                    PIPE_CAP_GENERATE_MIPMAP) ||
+       !st->pipe->generate_mipmap(st->pipe, pt, pt->format, baseLevel,
+                                  lastLevel, first_layer, last_layer)) {
+
+      if (!util_gen_mipmap(st->pipe, pt, pt->format, baseLevel, lastLevel,
+                           first_layer, last_layer, PIPE_TEX_FILTER_LINEAR)) {
+         _mesa_generate_mipmap(ctx, target, texObj);
+      }
    }
 
    /* Fill in the Mesa gl_texture_image fields */