[virglrenderer-devel] [PATCH 09/19] tessellation: add shader property support

[Dave Airlie]

From: Dave Airlie <airlied at redhat.com>

This takes the tgsi shader properties and emits the correct GLSL
layouts.
---
 src/vrend_shader.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

diff --git a/src/vrend_shader.c b/src/vrend_shader.c
index 89e9fa7..07f9555 100644
--- a/src/vrend_shader.c
+++ b/src/vrend_shader.c
@@ -166,6 +166,12 @@ struct dump_ctx {
    bool has_clipvertex_so;
    bool vs_has_pervertex;
    bool write_mul_temp;
+
+   int tcs_vertices_out;
+   int tes_prim_mode;
+   int tes_spacing;
+   int tes_vertex_order;
+   int tes_point_mode;
 };
 
 static const struct vrend_shader_table shader_req_table[] = {
@@ -283,6 +289,29 @@ static inline const char *prim_to_name(int prim)
    };
 }
 
+static inline const char *prim_to_tes_name(int prim)
+{
+   switch (prim) {
+   case PIPE_PRIM_QUADS: return "quads";
+   case PIPE_PRIM_TRIANGLES: return "triangles";
+   case PIPE_PRIM_LINES: return "isolines";
+   default: return "UNKNOWN";
+   }
+}
+
+static const char *get_spacing_string(int spacing)
+{
+   switch (spacing) {
+   case PIPE_TESS_SPACING_FRACTIONAL_ODD:
+      return "fractional_odd_spacing";
+   case PIPE_TESS_SPACING_FRACTIONAL_EVEN:
+      return "fractional_even_spacing";
+   case PIPE_TESS_SPACING_EQUAL:
+   default:
+      return "equal_spacing";
+   }
+}
+
 static inline int gs_input_prim_to_size(int prim)
 {
    switch (prim) {
@@ -967,6 +996,26 @@ iter_property(struct tgsi_iterate_context *iter,
    if (prop->Property.PropertyName == TGSI_PROPERTY_NUM_CULLDIST_ENABLED) {
       ctx->num_cull_dist_prop = prop->u[0].Data;
    }
+
+   if (prop->Property.PropertyName == TGSI_PROPERTY_TCS_VERTICES_OUT) {
+      ctx->tcs_vertices_out = prop->u[0].Data;
+   }
+
+   if (prop->Property.PropertyName == TGSI_PROPERTY_TES_PRIM_MODE) {
+      ctx->tes_prim_mode = prop->u[0].Data;
+   }
+
+   if (prop->Property.PropertyName == TGSI_PROPERTY_TES_SPACING) {
+      ctx->tes_spacing = prop->u[0].Data;
+   }
+
+   if (prop->Property.PropertyName == TGSI_PROPERTY_TES_VERTEX_ORDER_CW) {
+      ctx->tes_vertex_order = prop->u[0].Data;
+   }
+
+   if (prop->Property.PropertyName == TGSI_PROPERTY_TES_POINT_MODE) {
+      ctx->tes_point_mode = prop->u[0].Data;
+   }
    return TRUE;
 }
 
@@ -2998,6 +3047,19 @@ static char *emit_ios(struct dump_ctx *ctx, char *glsl_hdr)
          STRCAT_WITH_RET(glsl_hdr, buf);
       }
    }
+   if (ctx->prog_type == TGSI_PROCESSOR_TESS_CTRL) {
+      snprintf(buf, 255, "layout(vertices = %d) out;\n", ctx->tcs_vertices_out);
+      STRCAT_WITH_RET(glsl_hdr, buf);
+   }
+   if (ctx->prog_type == TGSI_PROCESSOR_TESS_EVAL) {
+      snprintf(buf, 255, "layout(%s, %s, %s%s) in;\n",
+               prim_to_tes_name(ctx->tes_prim_mode),
+               get_spacing_string(ctx->tes_spacing),
+               ctx->tes_vertex_order ? "cw" : "ccw",
+               ctx->tes_point_mode ? ", point_mode" : "");
+      STRCAT_WITH_RET(glsl_hdr, buf);
+   }
+
    if (ctx->write_all_cbufs) {
       for (i = 0; i < 8; i++) {
          if (ctx->cfg->use_gles)
-- 
2.14.3