mesa: shader dump/read support for ARB programs

Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106283
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>

src/mesa/main/arbprogram.c

@@ -347,6 +347,21 @@ _mesa_ProgramStringARB(GLenum target, GLenum format, GLsizei len,
       return;
    }
 
+#ifdef ENABLE_SHADER_CACHE
+   GLcharARB *replacement;
+
+   gl_shader_stage stage = _mesa_program_enum_to_shader_stage(target);
+
+   /* Dump original shader source to MESA_SHADER_DUMP_PATH and replace
+    * if corresponding entry found from MESA_SHADER_READ_PATH.
+    */
+   _mesa_dump_shader_source(stage, string);
+
+   replacement = _mesa_read_shader_source(stage, string);
+   if (replacement)
+      string = replacement;
+#endif /* ENABLE_SHADER_CACHE */
+
    if (target == GL_VERTEX_PROGRAM_ARB && ctx->Extensions.ARB_vertex_program) {
       prog = ctx->VertexProgram.Current;
       _mesa_parse_arb_vertex_program(ctx, target, string, len, prog);

src/mesa/main/shaderapi.c

@@ -1795,6 +1795,7 @@ generate_sha1(const char *source, char sha_str[64])
  * following format:
  *
  * <path>/<stage prefix>_<CHECKSUM>.glsl
+ * <path>/<stage prefix>_<CHECKSUM>.arb
  */
 static char *
 construct_name(const gl_shader_stage stage, const char *source,
@@ -1805,15 +1806,17 @@ construct_name(const gl_shader_stage stage, const char *source,
       "VS", "TC", "TE", "GS", "FS", "CS",
    };
 
+   const char *format = strncmp(source, "!!ARB", 5) ? "glsl" : "arb";
+
    generate_sha1(source, sha);
-   return ralloc_asprintf(NULL, "%s/%s_%s.glsl", path, types[stage], sha);
+   return ralloc_asprintf(NULL, "%s/%s_%s.%s", path, types[stage], sha, format);
 }
 
 /**
  * Write given shader source to a file in MESA_SHADER_DUMP_PATH.
  */
-static void
+void
-dump_shader(const gl_shader_stage stage, const char *source)
+_mesa_dump_shader_source(const gl_shader_stage stage, const char *source)
 {
    static bool path_exists = true;
    char *dump_path;
@@ -1846,8 +1849,8 @@ dump_shader(const gl_shader_stage stage, const char *source)
  * Read shader source code from a file.
  * Useful for debugging to override an app's shader.
  */
-static GLcharARB *
+GLcharARB *
-read_shader(const gl_shader_stage stage, const char *source)
+_mesa_read_shader_source(const gl_shader_stage stage, const char *source)
 {
    char *read_path;
    static bool path_exists = true;
@@ -1971,9 +1974,9 @@ shader_source(struct gl_context *ctx, GLuint shaderObj, GLsizei count,
    /* Dump original shader source to MESA_SHADER_DUMP_PATH and replace
     * if corresponding entry found from MESA_SHADER_READ_PATH.
     */
-   dump_shader(sh->Stage, source);
+   _mesa_dump_shader_source(sh->Stage, source);
 
-   replacement = read_shader(sh->Stage, source);
+   replacement = _mesa_read_shader_source(sh->Stage, source);
    if (replacement) {
       free(source);
       source = replacement;

src/mesa/main/shaderapi.h

@@ -374,6 +374,12 @@ extern GLvoid GLAPIENTRY
 _mesa_GetProgramStageiv(GLuint program, GLenum shadertype,
                         GLenum pname, GLint *values);
 
+GLcharARB *
+_mesa_read_shader_source(const gl_shader_stage stage, const char *source);
+
+void
+_mesa_dump_shader_source(const gl_shader_stage stage, const char *source);
+
 #ifdef __cplusplus
 }
 #endif