mesa: validate sampler type across the whole program

Currently we were only making sure types were the same within a
single stage. This looks to have regressed with 953a0af8e3.

Fixes: 953a0af8e3 ("mesa: validate sampler uniforms during gluniform calls")

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
https://bugs.freedesktop.org/show_bug.cgi?id=97524

src/mesa/main/uniform_query.cpp

@@ -972,6 +972,8 @@ _mesa_uniform(GLint location, GLsizei count, const GLvoid *values,
     */
    if (uni->type->is_sampler()) {
       bool flushed = false;
+      shProg->SamplersValidated = GL_TRUE;
+
       for (int i = 0; i < MESA_SHADER_STAGES; i++) {
 	 struct gl_linked_shader *const sh = shProg->_LinkedShaders[i];
 

src/mesa/main/uniforms.c

@@ -67,11 +67,15 @@ void
 _mesa_update_shader_textures_used(struct gl_shader_program *shProg,
                                   struct gl_program *prog)
 {
+   GLbitfield mask = prog->SamplersUsed;
+   gl_shader_stage prog_stage =
+      _mesa_program_enum_to_shader_stage(prog->Target);
+   struct gl_linked_shader *shader = shProg->_LinkedShaders[prog_stage];
+
+   assert(shader);
+
    memset(prog->TexturesUsed, 0, sizeof(prog->TexturesUsed));
 
-   shProg->SamplersValidated = GL_TRUE;
-
-   GLbitfield mask = prog->SamplersUsed;
    while (mask) {
       const int s = u_bit_scan(&mask);
       GLuint unit = prog->SamplerUnits[s];
@@ -87,8 +91,20 @@ _mesa_update_shader_textures_used(struct gl_shader_program *shProg,
        *     types pointing to the same texture image unit within a program
        *     object."
        */
-      if (prog->TexturesUsed[unit] & ~(1 << tgt))
-         shProg->SamplersValidated = GL_FALSE;
+      unsigned stages_mask = shProg->data->linked_stages;
+      while (stages_mask) {
+         const int stage = u_bit_scan(&stages_mask);
+
+         /* Skip validation if we are yet to update textures used in this
+          * stage.
+          */
+         if (prog_stage < stage)
+            break;
+
+         struct gl_program *glprog = shProg->_LinkedShaders[stage]->Program;
+         if (glprog->TexturesUsed[unit] & ~(1 << tgt))
+            shProg->SamplersValidated = GL_FALSE;
+      }
 
       prog->TexturesUsed[unit] |= (1 << tgt);
    }

src/mesa/program/ir_to_mesa.cpp

@@ -3117,6 +3117,11 @@ _mesa_glsl_link_shader(struct gl_context *ctx, struct gl_shader_program *prog)
    }
 
    if (prog->data->LinkStatus) {
+      /* Reset sampler validated to true, validation happens via the
+       * LinkShader call below.
+       */
+      prog->SamplersValidated = GL_TRUE;
+
       if (!ctx->Driver.LinkShader(ctx, prog)) {
          prog->data->LinkStatus = linking_failure;
       }