panfrost: Determine unpacked type for formats

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5265>

diff --git a/src/panfrost/util/pan_lower_framebuffer.c b/src/panfrost/util/pan_lower_framebuffer.c
index 1df763c20dd1081d3c01eaee11d68861a48e7ca1..28c44f7b0cb1dad5244d3af605c8f822de5b2d78 100644 (file)
--- a/src/panfrost/util/pan_lower_framebuffer.c
+++ b/src/panfrost/util/pan_lower_framebuffer.c
@@ -51,3 +51,36 @@
 #include "compiler/nir/nir_builder.h"
 #include "compiler/nir/nir_format_convert.h"
 #include "util/format/u_format.h"
+#include "pan_lower_framebuffer.h"
+
+/* Determines the unpacked type best suiting a given format, so the rest of the
+ * pipeline may be adjusted accordingly */
+
+nir_alu_type
+pan_unpacked_type_for_format(const struct util_format_description *desc)
+{
+        int c = util_format_get_first_non_void_channel(desc->format);
+
+        if (c == -1)
+                unreachable("Void format not renderable");
+
+        bool large = (desc->channel[c].size > 16);
+        bool bit8 = (desc->channel[c].size == 8);
+        assert(desc->channel[c].size <= 32);
+
+        if (desc->channel[c].normalized)
+                return large ? nir_type_float32 : nir_type_float16;
+
+        switch (desc->channel[c].type) {
+        case UTIL_FORMAT_TYPE_UNSIGNED:
+                return bit8 ? nir_type_uint8 :
+                        large ? nir_type_uint32 : nir_type_uint16;
+        case UTIL_FORMAT_TYPE_SIGNED:
+                return bit8 ? nir_type_int8 :
+                        large ? nir_type_int32 : nir_type_int16;
+        case UTIL_FORMAT_TYPE_FLOAT:
+                return large ? nir_type_float32 : nir_type_float16;
+        default:
+                unreachable("Format not renderable");
+        }
+}

diff --git a/src/panfrost/util/pan_lower_framebuffer.h b/src/panfrost/util/pan_lower_framebuffer.h
new file mode 100644 (file)
index 0000000..b18660e
--- /dev/null
+++ b/src/panfrost/util/pan_lower_framebuffer.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2020 Collabora, Ltd.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Authors (Collabora):
+ *      Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
+ */
+
+#ifndef __PAN_LOWER_FRAMEBUFFER_H
+#define __PAN_LOWER_FRAMEBUFFER_H
+
+#include "compiler/nir/nir.h"
+#include "util/format/u_format.h"
+
+nir_alu_type pan_unpacked_type_for_format(const struct util_format_description *desc);
+
+#endif