shader: check for clip/cull distance support

This fixes an issue where a shader would be emitted using
EXT_clip_cull_distance even if the host didn't support the extension.

Fixes 072f30955b

Signed-off-by: Italo Nicola <italonicola@collabora.com>
Reviewed-by: John Bates <jbates@chromium.org>
Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org>

src/vrend_renderer.c

@@ -1781,10 +1781,12 @@ static struct vrend_linked_shader_program *add_shader_program(struct vrend_sub_c
          sprog->attrib_locs = NULL;
    }
 
-   sprog->clip_enabled_loc = glGetUniformLocation(prog_id, "clip_plane_enabled");
-   for (i = 0; i < VIRGL_NUM_CLIP_PLANES; i++) {
-      snprintf(name, 32, "clipp[%d]", i);
-      sprog->clip_locs[i] = glGetUniformLocation(prog_id, name);
+   if (has_feature(feat_cull_distance)) {
+      sprog->clip_enabled_loc = glGetUniformLocation(prog_id, "clip_plane_enabled");
+      for (i = 0; i < VIRGL_NUM_CLIP_PLANES; i++) {
+         snprintf(name, 32, "clipp[%d]", i);
+         sprog->clip_locs[i] = glGetUniformLocation(prog_id, name);
+      }
    }
    return sprog;
 }
@@ -4949,13 +4951,15 @@ int vrend_draw_vbo(struct vrend_context *ctx,
       sub_ctx->prog->viewport_neg_val = viewport_neg_val;
    }
 
-   if (sub_ctx->rs_state.clip_plane_enable) {
-      glUniform1i(sub_ctx->prog->clip_enabled_loc, 1);
-      for (i = 0 ; i < 8; i++) {
-         glUniform4fv(sub_ctx->prog->clip_locs[i], 1, (const GLfloat *)&sub_ctx->ucp_state.ucp[i]);
+   if (has_feature(feat_cull_distance)) {
+      if (sub_ctx->rs_state.clip_plane_enable) {
+         glUniform1i(sub_ctx->prog->clip_enabled_loc, 1);
+         for (i = 0 ; i < 8; i++) {
+            glUniform4fv(sub_ctx->prog->clip_locs[i], 1, (const GLfloat *)&sub_ctx->ucp_state.ucp[i]);
+         }
+      } else {
+         glUniform1i(sub_ctx->prog->clip_enabled_loc, 0);
       }
-   } else {
-      glUniform1i(sub_ctx->prog->clip_enabled_loc, 0);
    }
 
    if (has_feature(feat_gles31_vertex_attrib_binding))
@@ -6743,6 +6747,7 @@ struct vrend_context *vrend_create_context(int id, uint32_t nlen, const char *de
    grctx->shader_cfg.use_integer = vrend_state.use_integer;
    grctx->shader_cfg.has_dual_src_blend = has_feature(feat_dual_src_blend);
    grctx->shader_cfg.has_fbfetch_coherent = has_feature(feat_framebuffer_fetch);
+   grctx->shader_cfg.has_cull_distance = has_feature(feat_cull_distance);
 
    vrend_renderer_create_sub_ctx(grctx, 0);
    vrend_renderer_set_sub_ctx(grctx, 0);

src/vrend_shader.c

@@ -2146,7 +2146,8 @@ static void handle_vertex_proc_exit(const struct dump_ctx *ctx,
     if (ctx->so && !ctx->key->gs_present && !ctx->key->tes_present)
        emit_so_movs(ctx, glsl_strbufs, has_clipvertex_so);
 
-    emit_clip_dist_movs(ctx, glsl_strbufs);
+    if (ctx->cfg->has_cull_distance)
+       emit_clip_dist_movs(ctx, glsl_strbufs);
 
     if (!ctx->key->gs_present && !ctx->key->tes_present)
        emit_prescale(glsl_strbufs);
@@ -5391,9 +5392,9 @@ iter_instruction(struct tgsi_iterate_context *iter,
    case TGSI_OPCODE_END:
       if (iter->processor.Processor == TGSI_PROCESSOR_VERTEX) {
          handle_vertex_proc_exit(ctx, &ctx->glsl_strbufs, &ctx->has_clipvertex_so);
-      } else if (iter->processor.Processor == TGSI_PROCESSOR_TESS_CTRL) {
+      } else if (iter->processor.Processor == TGSI_PROCESSOR_TESS_CTRL && ctx->cfg->has_cull_distance) {
          emit_clip_dist_movs(ctx, &ctx->glsl_strbufs);
-      } else if (iter->processor.Processor == TGSI_PROCESSOR_TESS_EVAL) {
+      } else if (iter->processor.Processor == TGSI_PROCESSOR_TESS_EVAL && ctx->cfg->has_cull_distance) {
 	 if (ctx->so && !ctx->key->gs_present)
             emit_so_movs(ctx, &ctx->glsl_strbufs, &ctx->has_clipvertex_so);
          emit_clip_dist_movs(ctx, &ctx->glsl_strbufs);
@@ -5437,7 +5438,8 @@ iter_instruction(struct tgsi_iterate_context *iter,
       struct immed *imd = &ctx->imm[(inst->Src[0].Register.Index)];
       if (ctx->so && ctx->key->gs_present)
          emit_so_movs(ctx, &ctx->glsl_strbufs, &ctx->has_clipvertex_so);
-      emit_clip_dist_movs(ctx, &ctx->glsl_strbufs);
+      if (ctx->cfg->has_cull_distance)
+         emit_clip_dist_movs(ctx, &ctx->glsl_strbufs);
       emit_prescale(&ctx->glsl_strbufs);
       if (imd->val[inst->Src[0].Register.SwizzleX].ui > 0) {
          ctx->shader_req_bits |= SHADER_REQ_GPU_SHADER5;
@@ -5641,7 +5643,8 @@ static void emit_header(const struct dump_ctx *ctx, struct vrend_glsl_strbufs *g
    if (ctx->cfg->use_gles) {
       emit_ver_extf(glsl_strbufs, "#version %d es\n", ctx->cfg->glsl_version);
 
-      if ((ctx->shader_req_bits & SHADER_REQ_CLIP_DISTANCE) || ctx->num_out_clip_dist == 0) {
+      if ((ctx->shader_req_bits & SHADER_REQ_CLIP_DISTANCE) ||
+          (ctx->cfg->has_cull_distance && ctx->num_out_clip_dist == 0)) {
          emit_ext(glsl_strbufs, "EXT_clip_cull_distance", "require");
       }
 
@@ -6520,7 +6523,7 @@ static void emit_ios_vs(const struct dump_ctx *ctx,
    char cull_buf[64] = "";
    char clip_buf[64] = "";
 
-   if (ctx->num_out_clip_dist || ctx->is_last_vertex_stage) {
+   if (ctx->cfg->has_cull_distance && (ctx->num_out_clip_dist || ctx->is_last_vertex_stage)) {
       int num_clip_dists = ctx->num_clip_dist_prop ? ctx->num_clip_dist_prop : 0;
       int num_cull_dists = ctx->num_cull_dist_prop ? ctx->num_cull_dist_prop : 0;
 
@@ -6862,8 +6865,10 @@ static void emit_ios_geom(const struct dump_ctx *ctx,
       emit_hdrf(glsl_strbufs, "vec4 clip_dist_temp[2];\n");
    }
 
-   emit_hdr(glsl_strbufs, "uniform bool clip_plane_enabled;\n");
-   emit_hdr(glsl_strbufs, "uniform vec4 clipp[8];\n");
+   if (ctx->cfg->has_cull_distance) {
+       emit_hdr(glsl_strbufs, "uniform bool clip_plane_enabled;\n");
+       emit_hdr(glsl_strbufs, "uniform vec4 clipp[8];\n");
+   }
 }
 
 
@@ -6953,7 +6958,7 @@ static void emit_ios_tes(const struct dump_ctx *ctx,
    emit_ios_per_vertex_in(ctx, glsl_strbufs, has_pervertex);
    emit_ios_per_vertex_out(ctx, glsl_strbufs, "");
 
-   if (ctx->is_last_vertex_stage) {
+   if (ctx->cfg->has_cull_distance && ctx->is_last_vertex_stage) {
       emit_hdr(glsl_strbufs, "uniform bool clip_plane_enabled;\n");
       emit_hdr(glsl_strbufs, "uniform vec4 clipp[8];\n");
    }

src/vrend_shader.h

@@ -204,6 +204,7 @@ struct vrend_shader_cfg {
    uint32_t use_integer : 1;
    uint32_t has_dual_src_blend : 1;
    uint32_t has_fbfetch_coherent : 1;
+   uint32_t has_cull_distance : 1;
 };
 
 struct vrend_context;