gallivm,llvmpipe,draw: Support multiple constant buffers.

Support 16 (defined in LP_MAX_TGSI_CONST_BUFFERS) as opposed to 32 (as
defined by PIPE_MAX_CONSTANT_BUFFERS) because that would make the jit
context become unnecessarily large.

v2: Bump limit from 4 to 16 to cover ARB_uniform_buffer_object needs,
per Dave Airlie.

Reviewed-by: Brian Paul <brianp@vmware.com>

5 files changed, 37 insertions, 15 deletions

diff --git a/src/gallium/auxiliary/draw/draw_llvm.c b/src/gallium/auxiliary/draw/draw_llvm.c
index 6f0e1de..039db8f 100644
--- a/src/gallium/auxiliary/draw/draw_llvm.c
+++ b/src/gallium/auxiliary/draw/draw_llvm.c
@@ -161,8 +161,9 @@ create_jit_context_type(struct gallivm_state *gallivm,
    LLVMTypeRef elem_types[5];
    LLVMTypeRef context_type;
 
-   elem_types[0] = LLVMPointerType(float_type, 0); /* vs_constants */
-   elem_types[1] = LLVMPointerType(float_type, 0); /* gs_constants */
+   elem_types[0] = LLVMArrayType(LLVMPointerType(float_type, 0), /* vs_constants */
+                                 LP_MAX_TGSI_CONST_BUFFERS);
+   elem_types[1] = elem_types[0]; /* gs_constants */
    elem_types[2] = LLVMPointerType(LLVMArrayType(LLVMArrayType(float_type, 4),
                                                  DRAW_TOTAL_CLIP_PLANES), 0);
    elem_types[3] = LLVMPointerType(float_type, 0); /* viewport */
diff --git a/src/gallium/auxiliary/draw/draw_llvm.h b/src/gallium/auxiliary/draw/draw_llvm.h
index d7a630e..bd11886 100644
--- a/src/gallium/auxiliary/draw/draw_llvm.h
+++ b/src/gallium/auxiliary/draw/draw_llvm.h
@@ -32,6 +32,7 @@
 
 #include "draw/draw_vs.h"
 #include "gallivm/lp_bld_sample.h"
+#include "gallivm/lp_bld_limits.h"
 
 #include "pipe/p_context.h"
 #include "util/u_simple_list.h"
@@ -94,8 +95,8 @@ enum {
  */
 struct draw_jit_context
 {
-   const float *vs_constants;
-   const float *gs_constants;
+   const float *vs_constants[LP_MAX_TGSI_CONST_BUFFERS];
+   const float *gs_constants[LP_MAX_TGSI_CONST_BUFFERS];
    float (*planes) [DRAW_TOTAL_CLIP_PLANES][4];
    float *viewport;
 
@@ -104,10 +105,10 @@ struct draw_jit_context
 
 
 #define draw_jit_context_vs_constants(_gallivm, _ptr) \
-   lp_build_struct_get(_gallivm, _ptr, 0, "vs_constants")
+   lp_build_struct_get_ptr(_gallivm, _ptr, 0, "vs_constants")
 
 #define draw_jit_context_gs_constants(_gallivm, _ptr) \
-   lp_build_struct_get(_gallivm, _ptr, 1, "gs_constants")
+   lp_build_struct_get_ptr(_gallivm, _ptr, 1, "gs_constants")
 
 #define draw_jit_context_planes(_gallivm, _ptr) \
    lp_build_struct_get(_gallivm, _ptr, 2, "planes")
diff --git a/src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline_llvm.c b/src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline_llvm.c
index 04b286f..507c158 100644
--- a/src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline_llvm.c
+++ b/src/gallium/auxiliary/draw/draw_pt_fetch_shade_pipeline_llvm.c
@@ -81,6 +81,8 @@ llvm_middle_end_prepare( struct draw_pt_middle_end *middle,
    const unsigned nr = MAX2( shader->base.info.num_inputs,
                              shader->base.info.num_outputs + 1 );
 
+   unsigned i;
+
    fpme->input_prim = in_prim;
    fpme->opt = opt;
 
@@ -138,7 +140,6 @@ llvm_middle_end_prepare( struct draw_pt_middle_end *middle,
    }
    else {
       /* Need to create new variant */
-      unsigned i;
 
       /* First check if we've created too many variants.  If so, free
        * 25% of the LRU to avoid using too much memory.
@@ -171,11 +172,14 @@ llvm_middle_end_prepare( struct draw_pt_middle_end *middle,
 
    fpme->current_variant = variant;
 
-   /*XXX we only support one constant buffer */
-   fpme->llvm->jit_context.vs_constants =
-      draw->pt.user.vs_constants[0];
-   fpme->llvm->jit_context.gs_constants =
-      draw->pt.user.gs_constants[0];
+   for (i = 0; i < Elements(fpme->llvm->jit_context.vs_constants); ++i) {
+      fpme->llvm->jit_context.vs_constants[i] =
+         draw->pt.user.vs_constants[i];
+   }
+   for (i = 0; i < Elements(fpme->llvm->jit_context.gs_constants); ++i) {
+      fpme->llvm->jit_context.gs_constants[i] =
+         draw->pt.user.gs_constants[i];
+   }
    fpme->llvm->jit_context.planes =
       (float (*) [DRAW_TOTAL_CLIP_PLANES][4]) draw->pt.user.planes[0];
    fpme->llvm->jit_context.viewport =
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_limits.h b/src/gallium/auxiliary/gallivm/lp_bld_limits.h
index 905070e..30bed1b 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_limits.h
+++ b/src/gallium/auxiliary/gallivm/lp_bld_limits.h
@@ -51,6 +51,9 @@
 
 #define LP_MAX_TGSI_PREDS 16
 
+#define LP_MAX_TGSI_CONST_BUFFERS 16
+
+
 /**
  * Maximum control flow nesting
  *
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c b/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c
index cdc784c..9caac21 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c
@@ -63,6 +63,7 @@
 #include "lp_bld_debug.h"
 #include "lp_bld_printf.h"
 #include "lp_bld_sample.h"
+#include "lp_bld_struct.h"
 
 
 static void lp_exec_mask_init(struct lp_exec_mask *mask, struct lp_build_context *bld)
@@ -588,10 +589,22 @@ emit_fetch_constant(
    struct lp_build_context *uint_bld = &bld_base->uint_bld;
    LLVMValueRef indirect_index = NULL;
    struct lp_build_context *bld_fetch = stype_to_fetch(bld_base, stype);
-   
+   unsigned dimension = 0;
+   LLVMValueRef dimension_index;
+   LLVMValueRef consts_ptr;
+
    /* XXX: Handle fetching xyzw components as a vector */
    assert(swizzle != ~0);
 
+   if (reg->Register.Dimension) {
+      assert(!reg->Dimension.Indirect);
+      dimension = reg->Dimension.Index;
+      assert(dimension < LP_MAX_TGSI_CONST_BUFFERS);
+   }
+
+   dimension_index = lp_build_const_int32(gallivm, dimension);
+   consts_ptr = lp_build_array_get(gallivm, bld->consts_ptr, dimension_index);
+
    if (reg->Register.Indirect) {
       indirect_index = get_indirect_index(bld,
                                           reg->Register.File,
@@ -609,7 +622,7 @@ emit_fetch_constant(
       index_vec = lp_build_add(uint_bld, index_vec, swizzle_vec);
 
       /* Gather values from the constant buffer */
-      return build_gather(bld_fetch, bld->consts_ptr, index_vec);
+      return build_gather(bld_fetch, consts_ptr, index_vec);
    }
    else {
       LLVMValueRef index;  /* index into the const buffer */
@@ -617,7 +630,7 @@ emit_fetch_constant(
 
       index = lp_build_const_int32(gallivm, reg->Register.Index*4 + swizzle);
 
-      scalar_ptr = LLVMBuildGEP(builder, bld->consts_ptr,
+      scalar_ptr = LLVMBuildGEP(builder, consts_ptr,
                                    &index, 1, "");
 
       if (stype != TGSI_TYPE_FLOAT && stype != TGSI_TYPE_UNTYPED) {