[PATCH 2/2] vkd3d-shader/hlsl: Always align section sizes.

[Zebediah Figura]

From: Zebediah Figura

This fixes disassembly using native D3DDisassemble() of shaders generated with vkd3d-shader.

Fixes: d6d9aab31c290d3dc7a67110ba2b0ac916377929
---
 libs/vkd3d-shader/hlsl_sm4.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/libs/vkd3d-shader/hlsl_sm4.c b/libs/vkd3d-shader/hlsl_sm4.c
index fbe0272d..fe26a9f3 100644
--- a/libs/vkd3d-shader/hlsl_sm4.c
+++ b/libs/vkd3d-shader/hlsl_sm4.c
@@ -147,6 +147,16 @@ bool hlsl_sm4_usage_from_semantic(struct hlsl_ctx *ctx, const struct hlsl_semant
     return true;
 }

+static void add_section(struct dxbc_writer *dxbc, uint32_t tag, struct vkd3d_bytecode_buffer *buffer)
+{
+    /* Native D3DDisassemble() expects at least the sizes of the ISGN and OSGN
+     * sections to be aligned. Without this, the sections themselves will be
+     * aligned, but their reported sizes won't. */
+    size_t size = bytecode_align(buffer);
+
+    dxbc_writer_add_section(dxbc, tag, buffer->data, size);
+}
+
 static void write_sm4_signature(struct hlsl_ctx *ctx, struct dxbc_writer *dxbc, bool output)
 {
     struct vkd3d_bytecode_buffer buffer = {0};
@@ -252,7 +262,7 @@ static void write_sm4_signature(struct hlsl_ctx *ctx, struct dxbc_writer *dxbc,

set_u32(&buffer, count_position, i);

-    dxbc_writer_add_section(dxbc, output ? TAG_OSGN : TAG_ISGN, buffer.data, buffer.size);
+    add_section(dxbc, output ? TAG_OSGN : TAG_ISGN, &buffer);
 }

static const struct hlsl_type *get_array_type(const struct hlsl_type *type)
@@ -745,7 +755,7 @@ static void write_sm4_rdef(struct hlsl_ctx *ctx, struct dxbc_writer *dxbc)
     creator_offset = put_string(&buffer, vkd3d_shader_get_version(NULL, NULL));
     set_u32(&buffer, creator_position, creator_offset);

-    dxbc_writer_add_section(dxbc, TAG_RDEF, buffer.data, buffer.size);
+    add_section(dxbc, TAG_RDEF, &buffer);

vkd3d_free(extern_resources);
 }
@@ -2505,7 +2515,7 @@ static void write_sm4_shdr(struct hlsl_ctx *ctx,

set_u32(&buffer, token_count_position, bytecode_get_size(&buffer) / sizeof(uint32_t));

-    dxbc_writer_add_section(dxbc, TAG_SHDR, buffer.data, buffer.size);
+    add_section(dxbc, TAG_SHDR, &buffer);

vkd3d_free(extern_resources);
 }