mesa: split transform feedback buffer into its own struct

This will be used in a following patch to implement interface
query support for TRANSFORM_FEEDBACK_BUFFER.

Reviewed-by: Dave Airlie <airlied@redhat.com>

src/compiler/glsl/link_varyings.cpp

@@ -722,7 +722,7 @@ tfeedback_decl::store(struct gl_context *ctx, struct gl_shader_program *prog,
 
    /* Handle gl_SkipComponents. */
    if (this->skip_components) {
-      info->BufferStride[buffer] += this->skip_components;
+      info->Buffers[buffer].Stride += this->skip_components;
       return true;
    }
 
@@ -734,7 +734,7 @@ tfeedback_decl::store(struct gl_context *ctx, struct gl_shader_program *prog,
     *       and the buffer mode is INTERLEAVED_ATTRIBS_EXT.
     */
    if (prog->TransformFeedback.BufferMode == GL_INTERLEAVED_ATTRIBS &&
-       info->BufferStride[buffer] + this->num_components() >
+       info->Buffers[buffer].Stride + this->num_components() >
        ctx->Const.MaxTransformFeedbackInterleavedComponents) {
       linker_error(prog, "The MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS "
                    "limit has been exceeded.");
@@ -752,10 +752,11 @@ tfeedback_decl::store(struct gl_context *ctx, struct gl_shader_program *prog,
       info->Outputs[info->NumOutputs].NumComponents = output_size;
       info->Outputs[info->NumOutputs].StreamId = stream_id;
       info->Outputs[info->NumOutputs].OutputBuffer = buffer;
-      info->Outputs[info->NumOutputs].DstOffset = info->BufferStride[buffer];
+      info->Outputs[info->NumOutputs].DstOffset =
+         info->Buffers[buffer].Stride;
       ++info->NumOutputs;
-      info->BufferStride[buffer] += output_size;
-      info->BufferStream[buffer] = this->stream_id;
+      info->Buffers[buffer].Stride += output_size;
+      info->Buffers[buffer].Stream = this->stream_id;
       num_components -= output_size;
       location++;
       location_frac = 0;

src/mesa/drivers/dri/i965/gen6_sol.c

@@ -69,13 +69,13 @@ gen6_update_sol_surfaces(struct brw_context *brw)
                brw, xfb_obj->Buffers[buffer],
                &brw->gs.base.surf_offset[surf_index],
                linked_xfb_info->Outputs[i].NumComponents,
-               linked_xfb_info->BufferStride[buffer], buffer_offset);
+               linked_xfb_info->Buffers[buffer].Stride, buffer_offset);
          } else {
             brw_update_sol_surface(
                brw, xfb_obj->Buffers[buffer],
                &brw->ff_gs.surf_offset[surf_index],
                linked_xfb_info->Outputs[i].NumComponents,
-               linked_xfb_info->BufferStride[buffer], buffer_offset);
+               linked_xfb_info->Buffers[buffer].Stride, buffer_offset);
          }
       } else {
          if (!brw->geometry_program)

src/mesa/drivers/dri/i965/gen7_sol_state.c

@@ -70,7 +70,7 @@ upload_3dstate_so_buffers(struct brw_context *brw)
 	 continue;
       }
 
-      stride = linked_xfb_info->BufferStride[i] * 4;
+      stride = linked_xfb_info->Buffers[i].Stride * 4;
 
       start = xfb_obj->Offset[i];
       assert(start % 4 == 0);

src/mesa/drivers/dri/i965/gen8_sol_state.c

@@ -139,13 +139,13 @@ gen8_upload_3dstate_streamout(struct brw_context *brw, bool active,
 
       /* Set buffer pitches; 0 means unbound. */
       if (xfb_obj->Buffers[0])
-         dw3 |= linked_xfb_info->BufferStride[0] * 4;
+         dw3 |= linked_xfb_info->Buffers[0].Stride * 4;
       if (xfb_obj->Buffers[1])
-         dw3 |= (linked_xfb_info->BufferStride[1] * 4) << 16;
+         dw3 |= (linked_xfb_info->Buffers[1].Stride * 4) << 16;
       if (xfb_obj->Buffers[2])
-         dw4 |= linked_xfb_info->BufferStride[2] * 4;
+         dw4 |= linked_xfb_info->Buffers[2].Stride * 4;
       if (xfb_obj->Buffers[3])
-         dw4 |= (linked_xfb_info->BufferStride[3] * 4) << 16;
+         dw4 |= (linked_xfb_info->Buffers[3].Stride * 4) << 16;
    }
 
    BEGIN_BATCH(5);

src/mesa/main/mtypes.h

@@ -1644,6 +1644,24 @@ struct gl_transform_feedback_output
 };
 
 
+struct gl_transform_feedback_buffer
+{
+   unsigned Binding;
+
+   /**
+    * Total number of components stored in each buffer.  This may be used by
+    * hardware back-ends to determine the correct stride when interleaving
+    * multiple transform feedback outputs in the same buffer.
+    */
+   unsigned Stride;
+
+   /**
+    * Which transform feedback stream this buffer binding is associated with.
+    */
+   unsigned Stream;
+};
+
+
 /** Post-link transform feedback info. */
 struct gl_transform_feedback_info
 {
@@ -1661,17 +1679,7 @@ struct gl_transform_feedback_info
    struct gl_transform_feedback_varying_info *Varyings;
    GLint NumVarying;
 
-   /**
-    * Total number of components stored in each buffer.  This may be used by
-    * hardware back-ends to determine the correct stride when interleaving
-    * multiple transform feedback outputs in the same buffer.
-    */
-   unsigned BufferStride[MAX_FEEDBACK_BUFFERS];
-
-   /**
-    * Which transform feedback stream this buffer binding is associated with.
-    */
-   unsigned BufferStream[MAX_FEEDBACK_BUFFERS];
+   struct gl_transform_feedback_buffer Buffers[MAX_FEEDBACK_BUFFERS];
 };
 
 

src/mesa/main/transformfeedback.c

@@ -356,7 +356,7 @@ _mesa_compute_max_transform_feedback_vertices(struct gl_context *ctx,
 
    for (i = 0; i < ctx->Const.MaxTransformFeedbackBuffers; i++) {
       if ((info->ActiveBuffers >> i) & 1) {
-         unsigned stride = info->BufferStride[i];
+         unsigned stride = info->Buffers[i].Stride;
          unsigned max_for_this_buffer;
 
          /* Skip any inactive buffers, which have a stride of 0. */

src/mesa/state_tracker/st_glsl_to_tgsi.cpp

@@ -6861,7 +6861,7 @@ st_translate_stream_output_info(glsl_to_tgsi_visitor *glsl_to_tgsi,
    }
 
    for (i = 0; i < PIPE_MAX_SO_BUFFERS; i++) {
-      so->stride[i] = info->BufferStride[i];
+      so->stride[i] = info->Buffers[i].Stride;
    }
    so->num_outputs = info->NumOutputs;
 }