dzn: Fix exec_buf_stride calculation

The stride depends on the indirect draw arguments which are different if
triangle-fan emulation is required.

Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15912>

src/microsoft/vulkan/dzn_cmd_buffer.c

@@ -2785,10 +2785,13 @@ dzn_cmd_buffer_indirect_draw(struct dzn_cmd_buffer *cmdbuf,
    assert((draw_buf_stride & 3) == 0);
 
    uint32_t sysvals_stride = ALIGN_POT(sizeof(cmdbuf->state.sysvals.gfx), 256);
-   uint32_t exec_buf_stride = 32;
    uint32_t triangle_fan_index_buf_stride =
       dzn_cmd_buffer_triangle_fan_get_max_index_buf_size(cmdbuf, indexed) *
       sizeof(uint32_t);
+   uint32_t exec_buf_stride =
+      triangle_fan_index_buf_stride > 0 ?
+      sizeof(struct dzn_indirect_triangle_fan_draw_exec_params) :
+      sizeof(struct dzn_indirect_draw_exec_params);
    uint32_t triangle_fan_exec_buf_stride =
       sizeof(struct dzn_indirect_triangle_fan_rewrite_index_exec_params);
    ID3D12Resource *exec_buf;

src/microsoft/vulkan/dzn_nir.c

@@ -129,7 +129,10 @@ dzn_nir_indirect_draw_shader(enum dzn_indirect_draw_type type)
                    .align_mul = 4, .align_offset = 0, .range_base = 0, .range = ~0);
 
    nir_ssa_def *draw_stride = nir_channel(&b, params, 0);
-   nir_ssa_def *exec_stride = nir_imm_int(&b, sizeof(struct dzn_indirect_draw_exec_params));
+   nir_ssa_def *exec_stride =
+      triangle_fan ?
+      nir_imm_int(&b, sizeof(struct dzn_indirect_triangle_fan_draw_exec_params)) :
+      nir_imm_int(&b, sizeof(struct dzn_indirect_draw_exec_params));
    nir_ssa_def *index =
       nir_channel(&b, nir_load_global_invocation_id(&b, 32), 0);