1 files changed, 112 insertions, 0 deletions
diff --git a/src/glsl/spirv_glslang.c b/src/glsl/spirv_glslang.c
new file mode 100644
index 0000000..ffb8f55
--- /dev/null
+++ b/src/glsl/spirv_glslang.c
@@ -0,0 +1,112 @@
+/*
+ * This file is part of libplacebo.
+ *
+ * libplacebo is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * libplacebo is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with libplacebo. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "hash.h"
+#include "spirv.h"
+#include "utils.h"
+#include "glsl/glslang.h"
+
+// This header contains only preprocessor definitions
+#include <glslang/build_info.h>
+
+// This is awkward, but we cannot use upstream macro, it was fixed in 11.11.0
+#define PL_GLSLANG_VERSION_GREATER_THAN(major, minor, patch) \
+    ((GLSLANG_VERSION_MAJOR) > (major) || ((major) == GLSLANG_VERSION_MAJOR && \
+    ((GLSLANG_VERSION_MINOR) > (minor) || ((minor) == GLSLANG_VERSION_MINOR && \
+     (GLSLANG_VERSION_PATCH) > (patch)))))
+
+#if PL_GLSLANG_VERSION_GREATER_THAN(11, 8, 0)
+#define GLSLANG_SPV_MAX PL_SPV_VERSION(1, 6)
+#elif PL_GLSLANG_VERSION_GREATER_THAN(7, 13, 3496)
+#define GLSLANG_SPV_MAX PL_SPV_VERSION(1, 5)
+#elif PL_GLSLANG_VERSION_GREATER_THAN(6, 2, 2596)
+#define GLSLANG_SPV_MAX PL_SPV_VERSION(1, 3)
+#else
+#define GLSLANG_SPV_MAX PL_SPV_VERSION(1, 0)
+#endif
+
+const struct spirv_compiler pl_spirv_glslang;
+
+static void glslang_destroy(pl_spirv spirv)
+{
+    pl_glslang_uninit();
+    pl_free((void *) spirv);
+}
+
+static pl_spirv glslang_create(pl_log log, struct pl_spirv_version spirv_ver)
+{
+    if (!pl_glslang_init()) {
+        pl_fatal(log, "Failed initializing glslang SPIR-V compiler!");
+        return NULL;
+    }
+
+    struct pl_spirv_t *spirv = pl_alloc_ptr(NULL, spirv);
+    *spirv = (struct pl_spirv_t) {
+        .signature = pl_str0_hash(pl_spirv_glslang.name),
+        .impl      = &pl_spirv_glslang,
+        .version   = spirv_ver,
+        .log       = log,
+    };
+
+    PL_INFO(spirv, "glslang version: %d.%d.%d",
+            GLSLANG_VERSION_MAJOR,
+            GLSLANG_VERSION_MINOR,
+            GLSLANG_VERSION_PATCH);
+
+    // Clamp to supported version by glslang
+    if (GLSLANG_SPV_MAX < spirv->version.spv_version) {
+        spirv->version.spv_version = GLSLANG_SPV_MAX;
+        spirv->version.env_version = pl_spirv_version_to_vulkan(GLSLANG_SPV_MAX);
+    }
+
+    pl_hash_merge(&spirv->signature, (uint64_t) spirv->version.spv_version << 32 |
+                                                spirv->version.env_version);
+    pl_hash_merge(&spirv->signature, (GLSLANG_VERSION_MAJOR & 0xFF) << 24 |
+                                     (GLSLANG_VERSION_MINOR & 0xFF) << 16 |
+                                     (GLSLANG_VERSION_PATCH & 0xFFFF));
+    return spirv;
+}
+
+static pl_str glslang_compile(pl_spirv spirv, void *alloc,
+                              struct pl_glsl_version glsl_ver,
+                              enum glsl_shader_stage stage,
+                              const char *shader)
+{
+    struct pl_glslang_res *res;
+
+    res = pl_glslang_compile(glsl_ver, spirv->version, stage, shader);
+    if (!res || !res->success) {
+        PL_ERR(spirv, "glslang failed: %s", res ? res->error_msg : "(null)");
+        pl_free(res);
+        return (struct pl_str) {0};
+    }
+
+    struct pl_str ret = {
+        .buf = pl_steal(alloc, res->data),
+        .len = res->size,
+    };
+
+    pl_free(res);
+    return ret;
+}
+
+const struct spirv_compiler pl_spirv_glslang = {
+    .name       = "glslang",
+    .destroy    = glslang_destroy,
+    .create     = glslang_create,
+    .compile    = glslang_compile,
+};