mesa/glsl: introduce new gl_compile_status enum

This will allow us to tell if a shader really has been compiled or
if the shader cache has just seen it before.

Acked-by: Marek Olšák <marek.olsak@amd.com>

src/compiler/glsl/glsl_parser_extras.cpp

@@ -1946,7 +1946,7 @@ _mesa_glsl_compile_shader(struct gl_context *ctx, struct gl_shader *shader,
             fprintf(stderr, "deferring compile of shader: %s\n",
                     _mesa_sha1_format(buf, shader->sha1));
          }
-         shader->CompileStatus = true;
+         shader->CompileStatus = compile_skipped;
 
          free((void *)shader->FallbackSource);
          shader->FallbackSource = NULL;
@@ -2034,7 +2034,7 @@ _mesa_glsl_compile_shader(struct gl_context *ctx, struct gl_shader *shader,
       set_shader_inout_layout(shader, state);
 
    shader->symbols = new(shader->ir) glsl_symbol_table;
-   shader->CompileStatus = !state->error;
+   shader->CompileStatus = state->error ? compile_failure : compile_success;
    shader->InfoLog = state->info_log;
    shader->Version = state->language_version;
    shader->IsES = state->es_shader;

src/mesa/drivers/common/meta.c

@@ -131,7 +131,7 @@ meta_compile_shader_with_debug(struct gl_context *ctx, gl_shader_stage stage,
 
    sh = _mesa_new_shader(name, stage);
    sh->Source = strdup(source);
-   sh->CompileStatus = false;
+   sh->CompileStatus = compile_failure;
    _mesa_compile_shader(ctx, sh);
 
    if (!sh->CompileStatus) {

src/mesa/main/ff_fragment_shader.cpp

@@ -1273,7 +1273,7 @@ create_new_program(struct gl_context *ctx, struct state_key *key)
 
    reparent_ir(p.shader->ir, p.shader->ir);
 
-   p.shader->CompileStatus = true;
+   p.shader->CompileStatus = compile_success;
    p.shader->Version = state->language_version;
    p.shader_program->Shaders =
       (gl_shader **)malloc(sizeof(*p.shader_program->Shaders));

src/mesa/main/mtypes.h

@@ -2399,6 +2399,18 @@ static inline GLbitfield gl_external_samplers(struct gl_program *prog)
    return external_samplers;
 }
 
+/**
+ * Compile status enum. compile_skipped is used to indicate the compile
+ * was skipped due to the shader matching one that's been seen before by
+ * the on-disk cache.
+ */
+enum gl_compile_status
+{
+   compile_failure = 0,
+   compile_success,
+   compile_skipped
+};
+
 /**
  * A GLSL shader object.
  */
@@ -2415,7 +2427,7 @@ struct gl_shader
    GLchar *Label;   /**< GL_KHR_debug */
    unsigned char sha1[20]; /**< SHA1 hash of pre-processed source */
    GLboolean DeletePending;
-   GLboolean CompileStatus;
+   enum gl_compile_status CompileStatus;
    bool IsES;              /**< True if this shader uses GLSL ES */
 
 #ifdef DEBUG

src/mesa/main/shaderapi.c

@@ -903,7 +903,7 @@ get_shaderiv(struct gl_context *ctx, GLuint name, GLenum pname, GLint *params)
       *params = shader->DeletePending;
       break;
    case GL_COMPILE_STATUS:
-      *params = shader->CompileStatus;
+      *params = shader->CompileStatus ? GL_TRUE : GL_FALSE;
       break;
    case GL_INFO_LOG_LENGTH:
       *params = (shader->InfoLog && shader->InfoLog[0] != '\0') ?
@@ -1003,7 +1003,7 @@ shader_source(struct gl_shader *sh, const GLchar *source)
 {
    assert(sh);
 
-   if (sh->CompileStatus == GL_TRUE && !sh->FallbackSource) {
+   if (sh->CompileStatus == compile_skipped && !sh->FallbackSource) {
       /* If shader was previously compiled back-up the source in case of cache
        * fallback.
        */
@@ -1034,7 +1034,7 @@ _mesa_compile_shader(struct gl_context *ctx, struct gl_shader *sh)
       /* If the user called glCompileShader without first calling
        * glShaderSource, we should fail to compile, but not raise a GL_ERROR.
        */
-      sh->CompileStatus = GL_FALSE;
+      sh->CompileStatus = compile_failure;
    } else {
       if (ctx->_Shader->Flags & GLSL_DUMP) {
          _mesa_log("GLSL source for %s shader %d:\n",