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annotate include/SDL_assert.h @ 4590:1ad70fb49fcb

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Fix so many things that there is little place in this column to list them all but the result is that blending modes just work now for drawing primitives. Fixes involved: 1. Fix handling of alpha channel when SDL_BLENDMODE_NONE is set. 2. Make xrendercolor use floating-point values for color channels and then convert to 16 bit ints. 3. Fix handling of visuals in SDL_x11modes.c so that a 32 bit ARGB visual is used. 4. Fix the background pixel value in SDL_x11window.c so that the window background has an alpha value of 0xFF and not 0.
author Sunny Sachanandani <sunnysachanandani@gmail.com>
date Fri, 09 Jul 2010 21:36:41 +0530
parents f7b03b6838cb
children d306007299ac
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 #ifndef _SDL_assert_h
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24 #define _SDL_assert_h
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25
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26 #include "SDL_config.h"
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27
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28 #include "begin_code.h"
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29 /* Set up for C function definitions, even when using C++ */
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30 #ifdef __cplusplus
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31 /* *INDENT-OFF* */
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32 extern "C" {
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33 /* *INDENT-ON* */
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34 #endif
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35
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36 #ifndef SDL_ASSERT_LEVEL
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37 #ifdef SDL_DEFAULT_ASSERT_LEVEL
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38 #define SDL_ASSERT_LEVEL SDL_DEFAULT_ASSERT_LEVEL
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39 #elif defined(_DEBUG) || defined(DEBUG) || \
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40 (defined(__GNUC__) && !defined(__OPTIMIZE__))
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41 #define SDL_ASSERT_LEVEL 2
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42 #else
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43 #define SDL_ASSERT_LEVEL 1
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44 #endif
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45 #endif /* SDL_ASSERT_LEVEL */
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46
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47 /*
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48 These are macros and not first class functions so that the debugger breaks
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49 on the assertion line and not in some random guts of SDL, and so each
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50 assert can have unique static variables associated with it.
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51 */
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52
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53 #if (defined(_MSC_VER) && ((_M_IX86) || (_M_X64)))
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54 #define SDL_TriggerBreakpoint() __asm { int 3 }
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55 #elif (defined(__GNUC__) && ((__i386__) || (__x86_64__)))
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56 #define SDL_TriggerBreakpoint() __asm__ __volatile__ ( "int $3\n\t" )
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57 #elif defined(HAVE_SIGNAL_H)
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58 #include <signal.h>
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59 #define SDL_TriggerBreakpoint() raise(SIGTRAP)
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60 #else
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61 /* How do we trigger breakpoints on this platform? */
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62 #define SDL_TriggerBreakpoint()
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63 #endif
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64
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65 #if (__STDC_VERSION__ >= 199901L) /* C99 supports __func__ as a standard. */
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66 # define SDL_FUNCTION __func__
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67 #elif ((__GNUC__ >= 2) || defined(_MSC_VER))
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68 # define SDL_FUNCTION __FUNCTION__
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69 #else
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70 # define SDL_FUNCTION "???"
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71 #endif
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72 #define SDL_FILE __FILE__
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73 #define SDL_LINE __LINE__
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74
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75 /*
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76 sizeof (x) makes the compiler still parse the expression even without
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77 assertions enabled, so the code is always checked at compile time, but
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78 doesn't actually generate code for it, so there are no side effects or
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79 expensive checks at run time, just the constant size of what x WOULD be,
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80 which presumably gets optimized out as unused.
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81 This also solves the problem of...
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82
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83 int somevalue = blah();
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84 SDL_assert(somevalue == 1);
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85
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86 ...which would cause compiles to complain that somevalue is unused if we
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87 disable assertions.
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88 */
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89
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90 #define SDL_disabled_assert(condition) \
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91 do { (void) sizeof ((condition)); } while (0)
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92
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93 #if (SDL_ASSERT_LEVEL > 0)
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94
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95 typedef enum
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96 {
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97 SDL_ASSERTION_RETRY, /**< Retry the assert immediately. */
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98 SDL_ASSERTION_BREAK, /**< Make the debugger trigger a breakpoint. */
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99 SDL_ASSERTION_ABORT, /**< Terminate the program. */
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100 SDL_ASSERTION_IGNORE, /**< Ignore the assert. */
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101 SDL_ASSERTION_ALWAYS_IGNORE, /**< Ignore the assert from now on. */
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102 } SDL_assert_state;
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103
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104 typedef struct SDL_assert_data
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105 {
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106 int always_ignore;
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107 unsigned int trigger_count;
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108 const char *condition;
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109 const char *filename;
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110 int linenum;
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111 const char *function;
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112 const struct SDL_assert_data *next;
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113 } SDL_assert_data;
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114
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115 /* Never call this directly. Use the SDL_assert* macros. */
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116 extern DECLSPEC SDL_assert_state SDLCALL SDL_ReportAssertion(SDL_assert_data *,
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117 const char *,
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118 const char *, int);
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119
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120 /* the do {} while(0) avoids dangling else problems:
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121 if (x) SDL_assert(y); else blah();
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122 ... without the do/while, the "else" could attach to this macro's "if".
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123 We try to handle just the minimum we need here in a macro...the loop,
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124 the static vars, and break points. The heavy lifting is handled in
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125 SDL_ReportAssertion(), in SDL_assert.c.
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126 */
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127 #define SDL_enabled_assert(condition) \
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128 do { \
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129 while ( !(condition) ) { \
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130 static struct SDL_assert_data assert_data = { \
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131 0, 0, #condition, 0, 0, 0, 0 \
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132 }; \
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133 const SDL_assert_state state = SDL_ReportAssertion(&assert_data, \
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134 SDL_FUNCTION, \
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135 SDL_FILE, \
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136 SDL_LINE); \
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137 if (state == SDL_ASSERTION_RETRY) { \
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138 continue; /* go again. */ \
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139 } else if (state == SDL_ASSERTION_BREAK) { \
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140 SDL_TriggerBreakpoint(); \
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141 } \
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142 break; /* not retrying. */ \
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143 } \
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144 } while (0)
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145
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146 #endif /* enabled assertions support code */
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147
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148 /* Enable various levels of assertions. */
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149 #if SDL_ASSERT_LEVEL == 0 /* assertions disabled */
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150 # define SDL_assert(condition) SDL_disabled_assert(condition)
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151 # define SDL_assert_release(condition) SDL_disabled_assert(condition)
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152 # define SDL_assert_paranoid(condition) SDL_disabled_assert(condition)
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153 #elif SDL_ASSERT_LEVEL == 1 /* release settings. */
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154 # define SDL_assert(condition) SDL_disabled_assert(condition)
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155 # define SDL_assert_release(condition) SDL_enabled_assert(condition)
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156 # define SDL_assert_paranoid(condition) SDL_disabled_assert(condition)
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157 #elif SDL_ASSERT_LEVEL == 2 /* normal settings. */
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158 # define SDL_assert(condition) SDL_enabled_assert(condition)
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159 # define SDL_assert_release(condition) SDL_enabled_assert(condition)
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160 # define SDL_assert_paranoid(condition) SDL_disabled_assert(condition)
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161 #elif SDL_ASSERT_LEVEL == 3 /* paranoid settings. */
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162 # define SDL_assert(condition) SDL_enabled_assert(condition)
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163 # define SDL_assert_release(condition) SDL_enabled_assert(condition)
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164 # define SDL_assert_paranoid(condition) SDL_enabled_assert(condition)
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165 #else
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166 # error Unknown assertion level.
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167 #endif
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168
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169
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170 typedef SDL_assert_state (SDLCALL *SDL_AssertionHandler)(
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171 const SDL_assert_data *, void *userdata);
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172
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173 /**
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174 * \brief Set an application-defined assertion handler.
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175 *
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176 * This allows an app to show its own assertion UI and/or force the
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177 * response to an assertion failure. If the app doesn't provide this, SDL
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178 * will try to do the right thing, popping up a system-specific GUI dialog,
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179 * and probably minimizing any fullscreen windows.
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180 *
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181 * This callback may fire from any thread, but it runs wrapped in a mutex, so
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182 * it will only fire from one thread at a time.
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183 *
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184 * Setting the callback to NULL restores SDL's original internal handler.
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185 *
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186 * This callback is NOT reset to SDL's internal handler upon SDL_Quit()!
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187 *
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188 * \return SDL_assert_state value of how to handle the assertion failure.
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189 *
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190 * \param handler Callback function, called when an assertion fails.
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191 * \param userdata A pointer passed to the callback as-is.
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192 */
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193 extern DECLSPEC void SDLCALL SDL_SetAssertionHandler(
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194 SDL_AssertionHandler handler,
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195 void *userdata);
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196
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197 /**
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198 * \brief Get a list of all assertion failures.
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199 *
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200 * Get all assertions triggered since last call to SDL_ResetAssertionReport(),
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201 * or the start of the program.
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202 *
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203 * The proper way to examine this data looks something like this:
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204 *
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205 * <code>
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206 * const SDL_assert_data *item = SDL_GetAssertionReport();
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207 * while (item->condition) {
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208 * printf("'%s', %s (%s:%d), triggered %u times, always ignore: %s.\n",
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209 * item->condition, item->function, item->filename,
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210 * item->linenum, item->trigger_count,
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211 * item->always_ignore ? "yes" : "no");
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212 * item = item->next;
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213 * }
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214 * </code>
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215 *
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216 * \return List of all assertions. This never returns NULL,
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217 * even if there are no items.
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218 * \sa SDL_ResetAssertionReport
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219 */
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220 extern DECLSPEC const SDL_assert_data * SDLCALL SDL_GetAssertionReport(void);
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221
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222 /**
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223 * \brief Reset the list of all assertion failures.
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224 *
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225 * Reset list of all assertions triggered.
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226 *
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227 * \sa SDL_GetAssertionReport
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228 */
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229 extern DECLSPEC void SDLCALL SDL_ResetAssertionReport(void);
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230
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231 /* Ends C function definitions when using C++ */
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232 #ifdef __cplusplus
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233 /* *INDENT-OFF* */
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234 }
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235 /* *INDENT-ON* */
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236 #endif
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237 #include "close_code.h"
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238
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239 #endif /* _SDL_assert_h */
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240
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241 /* vi: set ts=4 sw=4 expandtab: */