i915: Let i915_program_error take a format string, and don't use _mesa_problem.

It's misleading to report things like the program having too many native
instructions as a Mesa implementation error, when the program may just be
too big for the hardware.

src/mesa/drivers/dri/i915/i915_fragprog.c

@@ -89,7 +89,8 @@ src_vector(struct i915_fragment_program *p,
        */
    case PROGRAM_TEMPORARY:
       if (source->Index >= I915_MAX_TEMPORARY) {
-         i915_program_error(p, "Exceeded max temporary reg");
+         i915_program_error(p, "Exceeded max temporary reg: %d/%d",
+			    source->Index, I915_MAX_TEMPORARY);
          return 0;
       }
       src = UREG(REG_TYPE_R, source->Index);
@@ -124,7 +125,7 @@ src_vector(struct i915_fragment_program *p,
          break;
 
       default:
-         i915_program_error(p, "Bad source->Index");
+         i915_program_error(p, "Bad source->Index: %d", source->Index);
          return 0;
       }
       break;
@@ -153,7 +154,7 @@ src_vector(struct i915_fragment_program *p,
       break;
 
    default:
-      i915_program_error(p, "Bad source->File");
+      i915_program_error(p, "Bad source->File: %d", source->File);
       return 0;
    }
 
@@ -186,13 +187,14 @@ get_result_vector(struct i915_fragment_program *p,
          p->depth_written = 1;
          return UREG(REG_TYPE_OD, 0);
       default:
-         i915_program_error(p, "Bad inst->DstReg.Index");
+         i915_program_error(p, "Bad inst->DstReg.Index: %d",
+			    inst->DstReg.Index);
          return 0;
       }
    case PROGRAM_TEMPORARY:
       return UREG(REG_TYPE_R, inst->DstReg.Index);
    default:
-      i915_program_error(p, "Bad inst->DstReg.File");
+      i915_program_error(p, "Bad inst->DstReg.File: %d", inst->DstReg.File);
       return 0;
    }
 }
@@ -231,7 +233,7 @@ translate_tex_src_target(struct i915_fragment_program *p, GLubyte bit)
    case TEXTURE_CUBE_INDEX:
       return D0_SAMPLE_TYPE_CUBE;
    default:
-      i915_program_error(p, "TexSrcBit");
+      i915_program_error(p, "TexSrcBit: %d", bit);
       return 0;
    }
 }
@@ -870,7 +872,8 @@ upload_program(struct i915_fragment_program *p)
          return;
 
       default:
-         i915_program_error(p, "bad opcode");
+         i915_program_error(p, "bad opcode: %s",
+			    _mesa_opcode_string(inst->Opcode));
          return;
       }
 

src/mesa/drivers/dri/i915/i915_program.c

@@ -424,12 +424,21 @@ i915_emit_param4fv(struct i915_fragment_program * p, const GLfloat * values)
    return 0;
 }
 
-
-
+/* Warning the user about program errors seems to be quite valuable, from
+ * our bug reports.  It unfortunately means piglit reporting errors
+ * when we fall back to software due to an unsupportable program, though.
+ */
 void
-i915_program_error(struct i915_fragment_program *p, const char *msg)
+i915_program_error(struct i915_fragment_program *p, const char *fmt, ...)
 {
-   _mesa_problem(NULL, "i915_program_error: %s", msg);
+   va_list args;
+
+   fprintf(stderr, "i915_program_error: ");
+   va_start(args, fmt);
+   vfprintf(stderr, fmt, args);
+   va_end(args);
+
+   fprintf(stderr, "\n");
    p->error = 1;
 }
 

src/mesa/drivers/dri/i915/i915_program.h

@@ -145,7 +145,7 @@ extern GLuint i915_emit_param4fv(struct i915_fragment_program *p,
                                  const GLfloat * values);
 
 extern void i915_program_error(struct i915_fragment_program *p,
-                               const char *msg);
+                               const char *fmt, ...);
 
 extern void i915_init_program(struct i915_context *i915,
                               struct i915_fragment_program *p);