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>

3 files changed, 18 insertions, 12 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 =