1 files changed, 79 insertions, 0 deletions
diff --git a/third_party/rust/gfx-backend-metal/shaders/clear.metal b/third_party/rust/gfx-backend-metal/shaders/clear.metal
new file mode 100644
index 0000000000..4adbdd3b56
--- /dev/null
+++ b/third_party/rust/gfx-backend-metal/shaders/clear.metal
@@ -0,0 +1,79 @@
+#include "macros.h"
+#include <metal_stdlib>
+using namespace metal;
+
+//TODO: simplified code path for Metal 2.0?
+//> Starting in Metal 2.0, the [[color(n)]] and [[raster_order_group(index)]] indices can
+//> also be a function constant. The function constant specified as indices for color and
+//> raster order group attributes must be a scalar integer type.
+
+typedef struct {
+    float4 coords [[attribute(0)]];
+} ClearAttributes;
+
+typedef struct {
+    float4 position [[position]];
+    uint layer GFX_RENDER_TARGET_ARRAY_INDEX;
+} ClearVertexData;
+
+vertex ClearVertexData vs_clear(ClearAttributes in [[stage_in]]) {
+    float4 pos = { 0.0, 0.0, in.coords.z, 1.0f };
+    pos.xy = in.coords.xy * 2.0 - 1.0;
+    return ClearVertexData { pos, uint(in.coords.w) };
+}
+
+
+fragment float4 ps_clear0_float(
+    ClearVertexData in [[stage_in]],
+    constant float4 &value [[ buffer(0) ]]
+) {
+  return value;
+}
+
+fragment int4 ps_clear0_int(
+    ClearVertexData in [[stage_in]],
+    constant int4 &value [[ buffer(0) ]]
+) {
+  return value;
+}
+
+fragment uint4 ps_clear0_uint(
+    ClearVertexData in [[stage_in]],
+    constant uint4 &value [[ buffer(0) ]]
+) {
+  return value;
+}
+
+
+typedef struct {
+    float4 color [[color(1)]];
+} Clear1FloatFragment;
+
+fragment Clear1FloatFragment ps_clear1_float(
+    ClearVertexData in [[stage_in]],
+    constant float4 &value [[ buffer(0) ]]
+) {
+  return Clear1FloatFragment { value };
+}
+
+typedef struct {
+    int4 color [[color(1)]];
+} Clear1IntFragment;
+
+fragment Clear1IntFragment ps_clear1_int(
+    ClearVertexData in [[stage_in]],
+    constant int4 &value [[ buffer(0) ]]
+) {
+  return Clear1IntFragment { value };
+}
+
+typedef struct {
+    uint4 color [[color(1)]];
+} Clear1UintFragment;
+
+fragment Clear1UintFragment ps_clear1_uint(
+    ClearVertexData in [[stage_in]],
+    constant uint4 &value [[ buffer(0) ]]
+) {
+  return Clear1UintFragment { value };
+}