glsl: change GLSL #pragma initialization

Initialize the shader's pragma settings before calling the compiler.
Added pragma "Ignore" fields to allow overriding the #pragma directives found
in shader source code.

src/mesa/main/mtypes.h

@@ -1956,6 +1956,8 @@ struct gl_query_state
 /** Set by #pragma directives */
 struct gl_sl_pragmas
 {
+   GLboolean IgnoreOptimize;  /**< ignore #pragma optimize(on/off) ? */
+   GLboolean IgnoreDebug;     /**< ignore #pragma debug(on/off) ? */
    GLboolean Optimize;  /**< defaults on */
    GLboolean Debug;     /**< defaults off */
 };
@@ -2026,6 +2028,7 @@ struct gl_shader_state
    GLboolean EmitComments;              /**< Annotated instructions */
    void *MemPool;
    GLbitfield Flags;                    /**< Mask of GLSL_x flags */
+   struct gl_sl_pragmas DefaultPragmas; /**< Default #pragma settings */
 };
 
 

src/mesa/shader/shader_api.c

@@ -410,6 +410,12 @@ _mesa_init_shader_state(GLcontext * ctx)
    ctx->Shader.EmitCondCodes = GL_FALSE;
    ctx->Shader.EmitComments = GL_FALSE;
    ctx->Shader.Flags = get_shader_flags();
+
+   /* Default pragma settings */
+   ctx->Shader.DefaultPragmas.IgnoreOptimize = GL_FALSE;
+   ctx->Shader.DefaultPragmas.IgnoreDebug = GL_FALSE;
+   ctx->Shader.DefaultPragmas.Optimize = GL_TRUE;
+   ctx->Shader.DefaultPragmas.Debug = GL_FALSE;
 }
 
 
@@ -1444,6 +1450,9 @@ _mesa_compile_shader(GLcontext *ctx, GLuint shaderObj)
    if (!sh)
       return;
 
+   /* set default pragma state for shader */
+   sh->Pragmas = ctx->Shader.DefaultPragmas;
+
    /* this call will set the sh->CompileStatus field to indicate if
     * compilation was successful.
     */

src/mesa/shader/slang/slang_compile.c

@@ -2798,7 +2798,9 @@ _slang_compile(GLcontext *ctx, struct gl_shader *shader)
    shader->CompileStatus = success;
 
    if (success) {
-      _mesa_optimize_program(ctx, shader->Program);
+      if (shader->Pragmas.Optimize) {
+         _mesa_optimize_program(ctx, shader->Program);
+      }
    }
 
    if (ctx->Shader.Flags & GLSL_LOG) {

src/mesa/shader/slang/slang_preprocess.c

@@ -530,14 +530,6 @@ pp_ext_set(pp_ext *self, const char *name, GLboolean enable)
 }
 
 
-static void
-pp_pragmas_init(struct gl_sl_pragmas *pragmas)
-{
-   pragmas->Optimize = GL_TRUE;
-   pragmas->Debug = GL_FALSE;
-}
-
-
 /**
  * Called in response to #pragma.  For example, "#pragma debug(on)" would
  * call this function as pp_pragma("debug", "on").
@@ -553,10 +545,12 @@ pp_pragma(struct gl_sl_pragmas *pragmas, const char *pragma, const char *param)
       if (!param)
          return GL_FALSE; /* missing required param */
       if (_mesa_strcmp(param, "on") == 0) {
-         pragmas->Optimize = GL_TRUE;
+         if (!pragmas->IgnoreOptimize)
+            pragmas->Optimize = GL_TRUE;
       }
       else if (_mesa_strcmp(param, "off") == 0) {
-         pragmas->Optimize = GL_FALSE;
+         if (!pragmas->IgnoreOptimize)
+            pragmas->Optimize = GL_FALSE;
       }
       else {
          return GL_FALSE; /* invalid param */
@@ -566,10 +560,12 @@ pp_pragma(struct gl_sl_pragmas *pragmas, const char *pragma, const char *param)
       if (!param)
          return GL_FALSE; /* missing required param */
       if (_mesa_strcmp(param, "on") == 0) {
-         pragmas->Debug = GL_TRUE;
+         if (!pragmas->IgnoreDebug)
+            pragmas->Debug = GL_TRUE;
       }
       else if (_mesa_strcmp(param, "off") == 0) {
-         pragmas->Debug = GL_FALSE;
+         if (!pragmas->IgnoreDebug)
+            pragmas->Debug = GL_FALSE;
       }
       else {
          return GL_FALSE; /* invalid param */
@@ -945,7 +941,6 @@ preprocess_source (slang_string *output, const char *source,
    }
 
    pp_state_init (&state, elog, extensions);
-   pp_pragmas_init (pragmas);
 
    /* add the predefined symbols to the symbol table */
    for (i = 0; predefined[i]; i++) {
@@ -1296,6 +1291,8 @@ error:
  * \param output  the post-process results
  * \param input  the input text
  * \param elog  log to record warnings, errors
+ * \param extensions  out extension settings
+ * \param pragmas  in/out #pragma settings
  * \return GL_TRUE for success, GL_FALSE for error
  */
 GLboolean