draw/llvm: adjust the instance id at run time

fixes instancing in draw llvm

src/gallium/auxiliary/draw/draw_llvm.c

@@ -369,7 +369,7 @@ generate_fetch(LLVMBuilderRef builder,
                struct pipe_vertex_element *velem,
                LLVMValueRef vbuf,
                LLVMValueRef index,
-               unsigned instance_id)
+               LLVMValueRef instance_id)
 {
    LLVMValueRef indices = LLVMConstInt(LLVMInt64Type(), velem->vertex_buffer_index, 0);
    LLVMValueRef vbuffer_ptr = LLVMBuildGEP(builder, vbuffers_ptr,
@@ -382,6 +382,10 @@ generate_fetch(LLVMBuilderRef builder,
 
    cond = LLVMBuildICmp(builder, LLVMIntULE, index, vb_max_index, "");
 
+   if (velem->instance_divisor) {
+      index = instance_id;
+   }
+
    index = LLVMBuildSelect(builder, cond, index, vb_max_index, "");
 
    stride = LLVMBuildMul(builder, vb_stride, index, "");
@@ -394,11 +398,6 @@ generate_fetch(LLVMBuilderRef builder,
    stride = LLVMBuildAdd(builder, stride,
                          LLVMConstInt(LLVMInt32Type(), velem->src_offset, 0),
                          "");
-   if (velem->instance_divisor) {
-      stride = LLVMBuildMul(builder, stride,
-                            LLVMConstInt(LLVMInt32Type(), instance_id, 0),
-                            "");
-   }
 
    /*lp_build_printf(builder, "vbuf index = %d, stride is %d\n", indices, stride);*/
    vbuffer_ptr = LLVMBuildGEP(builder, vbuffer_ptr, &stride, 1, "");
@@ -654,13 +653,14 @@ convert_to_aos(LLVMBuilderRef builder,
 static void
 draw_llvm_generate(struct draw_llvm *llvm, struct draw_llvm_variant *variant)
 {
-   LLVMTypeRef arg_types[7];
+   LLVMTypeRef arg_types[8];
    LLVMTypeRef func_type;
    LLVMValueRef context_ptr;
    LLVMBasicBlockRef block;
    LLVMBuilderRef builder;
    LLVMValueRef start, end, count, stride, step, io_itr;
    LLVMValueRef io_ptr, vbuffers_ptr, vb_ptr;
+   LLVMValueRef instance_id;
    struct draw_context *draw = llvm->draw;
    unsigned i, j;
    struct lp_build_context bld;
@@ -678,6 +678,7 @@ draw_llvm_generate(struct draw_llvm *llvm, struct draw_llvm_variant *variant)
    arg_types[4] = LLVMInt32Type();                  /* count */
    arg_types[5] = LLVMInt32Type();                  /* stride */
    arg_types[6] = llvm->vb_ptr_type;                /* pipe_vertex_buffer's */
+   arg_types[7] = LLVMInt32Type();                  /* instance_id */
 
    func_type = LLVMFunctionType(LLVMVoidType(), arg_types, Elements(arg_types), 0);
 
@@ -694,6 +695,7 @@ draw_llvm_generate(struct draw_llvm *llvm, struct draw_llvm_variant *variant)
    count        = LLVMGetParam(variant->function, 4);
    stride       = LLVMGetParam(variant->function, 5);
    vb_ptr       = LLVMGetParam(variant->function, 6);
+   instance_id  = LLVMGetParam(variant->function, 7);
 
    lp_build_name(context_ptr, "context");
    lp_build_name(io_ptr, "io");
@@ -702,6 +704,7 @@ draw_llvm_generate(struct draw_llvm *llvm, struct draw_llvm_variant *variant)
    lp_build_name(count, "count");
    lp_build_name(stride, "stride");
    lp_build_name(vb_ptr, "vb");
+   lp_build_name(instance_id, "instance_id");
 
    /*
     * Function body
@@ -752,7 +755,7 @@ draw_llvm_generate(struct draw_llvm *llvm, struct draw_llvm_variant *variant)
                                            &vb_index, 1, "");
             generate_fetch(builder, vbuffers_ptr,
                            &aos_attribs[j][i], velem, vb, true_index,
-                           draw->instance_id);
+                           instance_id);
          }
       }
       convert_to_soa(builder, aos_attribs, inputs,
@@ -807,13 +810,14 @@ draw_llvm_generate(struct draw_llvm *llvm, struct draw_llvm_variant *variant)
 static void
 draw_llvm_generate_elts(struct draw_llvm *llvm, struct draw_llvm_variant *variant)
 {
-   LLVMTypeRef arg_types[7];
+   LLVMTypeRef arg_types[8];
    LLVMTypeRef func_type;
    LLVMValueRef context_ptr;
    LLVMBasicBlockRef block;
    LLVMBuilderRef builder;
    LLVMValueRef fetch_elts, fetch_count, stride, step, io_itr;
    LLVMValueRef io_ptr, vbuffers_ptr, vb_ptr;
+   LLVMValueRef instance_id;
    struct draw_context *draw = llvm->draw;
    unsigned i, j;
    struct lp_build_context bld;
@@ -833,14 +837,17 @@ draw_llvm_generate_elts(struct draw_llvm *llvm, struct draw_llvm_variant *varian
    arg_types[4] = LLVMInt32Type();                      /* fetch_count */
    arg_types[5] = LLVMInt32Type();                      /* stride */
    arg_types[6] = llvm->vb_ptr_type;                    /* pipe_vertex_buffer's */
+   arg_types[7] = LLVMInt32Type();                      /* instance_id */
 
    func_type = LLVMFunctionType(LLVMVoidType(), arg_types, Elements(arg_types), 0);
 
-   variant->function_elts = LLVMAddFunction(llvm->module, "draw_llvm_shader_elts", func_type);
+   variant->function_elts = LLVMAddFunction(llvm->module, "draw_llvm_shader_elts",
+                                            func_type);
    LLVMSetFunctionCallConv(variant->function_elts, LLVMCCallConv);
    for(i = 0; i < Elements(arg_types); ++i)
       if(LLVMGetTypeKind(arg_types[i]) == LLVMPointerTypeKind)
-         LLVMAddAttribute(LLVMGetParam(variant->function_elts, i), LLVMNoAliasAttribute);
+         LLVMAddAttribute(LLVMGetParam(variant->function_elts, i),
+                          LLVMNoAliasAttribute);
 
    context_ptr  = LLVMGetParam(variant->function_elts, 0);
    io_ptr       = LLVMGetParam(variant->function_elts, 1);
@@ -849,6 +856,7 @@ draw_llvm_generate_elts(struct draw_llvm *llvm, struct draw_llvm_variant *varian
    fetch_count  = LLVMGetParam(variant->function_elts, 4);
    stride       = LLVMGetParam(variant->function_elts, 5);
    vb_ptr       = LLVMGetParam(variant->function_elts, 6);
+   instance_id  = LLVMGetParam(variant->function_elts, 7);
 
    lp_build_name(context_ptr, "context");
    lp_build_name(io_ptr, "io");
@@ -857,6 +865,7 @@ draw_llvm_generate_elts(struct draw_llvm *llvm, struct draw_llvm_variant *varian
    lp_build_name(fetch_count, "fetch_count");
    lp_build_name(stride, "stride");
    lp_build_name(vb_ptr, "vb");
+   lp_build_name(instance_id, "instance_id");
 
    /*
     * Function body
@@ -916,7 +925,7 @@ draw_llvm_generate_elts(struct draw_llvm *llvm, struct draw_llvm_variant *varian
                                            &vb_index, 1, "");
             generate_fetch(builder, vbuffers_ptr,
                            &aos_attribs[j][i], velem, vb, true_index,
-                           draw->instance_id);
+                           instance_id);
          }
       }
       convert_to_soa(builder, aos_attribs, inputs,

src/gallium/auxiliary/draw/draw_llvm.h

@@ -135,7 +135,8 @@ typedef void
                       unsigned start,
                       unsigned count,
                       unsigned stride,
-                      struct pipe_vertex_buffer *vertex_buffers);
+                      struct pipe_vertex_buffer *vertex_buffers,
+                      unsigned instance_id);
 
 
 typedef void
@@ -145,7 +146,8 @@ typedef void
                            const unsigned *fetch_elts,
                            unsigned fetch_count,
                            unsigned stride,
-                           struct pipe_vertex_buffer *vertex_buffers);
+                           struct pipe_vertex_buffer *vertex_buffers,
+                           unsigned instance_id);
 
 struct draw_llvm_variant_key
 {

src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline_llvm.c

@@ -233,7 +233,8 @@ llvm_pipeline_generic( struct draw_pt_middle_end *middle,
                                        fetch_info->start,
                                        fetch_info->count,
                                        fpme->vertex_size,
-                                       draw->pt.vertex_buffer );
+                                       draw->pt.vertex_buffer,
+                                       draw->instance_id);
    else
       fpme->current_variant->jit_func_elts( &fpme->llvm->jit_context,
                                             llvm_vert_info.verts,
@@ -241,7 +242,8 @@ llvm_pipeline_generic( struct draw_pt_middle_end *middle,
                                             fetch_info->elts,
                                             fetch_info->count,
                                             fpme->vertex_size,
-                                            draw->pt.vertex_buffer);
+                                            draw->pt.vertex_buffer,
+                                            draw->instance_id);
 
    /* Finished with fetch and vs:
     */