From 25232f2b2b35bcf1c265bc380c31cd1d32e4f4a6 Mon Sep 17 00:00:00 2001
From: Henri Verbeet <hverbeet@codeweavers.com>
Date: Sun, 29 Sep 2024 23:51:43 +0200
Subject: [PATCH] vkd3d-shader/glsl: Implement VKD3DSIH_IMUL.

---
 libs/vkd3d-shader/glsl.c              | 34 +++++++++++++++++++++++++++
 tests/hlsl/default-values.shader_test |  2 +-
 2 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/libs/vkd3d-shader/glsl.c b/libs/vkd3d-shader/glsl.c
index 6a8a5628..c2fb58c5 100644
--- a/libs/vkd3d-shader/glsl.c
+++ b/libs/vkd3d-shader/glsl.c
@@ -864,6 +864,37 @@ static void shader_glsl_movc(struct vkd3d_glsl_generator *gen, const struct vkd3
     glsl_dst_cleanup(&dst, &gen->string_buffers);
 }
 
+static void shader_glsl_mul_extended(struct vkd3d_glsl_generator *gen, const struct vkd3d_shader_instruction *ins)
+{
+    struct glsl_src src[2];
+    struct glsl_dst dst;
+    uint32_t mask;
+
+    if (ins->dst[0].reg.type != VKD3DSPR_NULL)
+    {
+        /* FIXME: imulExtended()/umulExtended() from ARB_gpu_shader5/GLSL 4.00+. */
+        mask = glsl_dst_init(&dst, gen, ins, &ins->dst[0]);
+        shader_glsl_print_assignment(gen, &dst, "<unhandled 64-bit multiplication>");
+        glsl_dst_cleanup(&dst, &gen->string_buffers);
+
+        vkd3d_glsl_compiler_error(gen, VKD3D_SHADER_ERROR_GLSL_INTERNAL,
+                "Internal compiler error: Unhandled 64-bit integer multiplication.");
+    }
+
+    if (ins->dst[1].reg.type != VKD3DSPR_NULL)
+    {
+        mask = glsl_dst_init(&dst, gen, ins, &ins->dst[1]);
+        glsl_src_init(&src[0], gen, &ins->src[0], mask);
+        glsl_src_init(&src[1], gen, &ins->src[1], mask);
+
+        shader_glsl_print_assignment(gen, &dst, "%s * %s", src[0].str->buffer, src[1].str->buffer);
+
+        glsl_src_cleanup(&src[1], &gen->string_buffers);
+        glsl_src_cleanup(&src[0], &gen->string_buffers);
+        glsl_dst_cleanup(&dst, &gen->string_buffers);
+    }
+}
+
 static void shader_glsl_print_sysval_name(struct vkd3d_string_buffer *buffer, struct vkd3d_glsl_generator *gen,
         enum vkd3d_shader_sysval_semantic sysval, unsigned int idx)
 {
@@ -1077,6 +1108,9 @@ static void vkd3d_glsl_handle_instruction(struct vkd3d_glsl_generator *gen,
         case VKD3DSIH_LTO:
             shader_glsl_relop(gen, ins, "<", "lessThan");
             break;
+        case VKD3DSIH_IMUL:
+            shader_glsl_mul_extended(gen, ins);
+            break;
         case VKD3DSIH_ISHL:
             shader_glsl_binop(gen, ins, "<<");
             break;
diff --git a/tests/hlsl/default-values.shader_test b/tests/hlsl/default-values.shader_test
index 62722b68..7a759b36 100644
--- a/tests/hlsl/default-values.shader_test
+++ b/tests/hlsl/default-values.shader_test
@@ -88,7 +88,7 @@ if(sm<4)  uniform 0 float4 10 20 30 40
 if(sm<4)  uniform 4 float4 50 60 70 80
 if(sm>=4) uniform 0 int4 10 20 30 40
 if(sm>=4) uniform 4 int4 50 60 70 80
-todo(glsl) draw quad
+draw quad
 probe (0, 0) rgba (100, 120, 140, 160)