IABSD.fr/xenocara/dist/libepoxy/test/wgl_per_context_funcptrs.c

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• Author : matthieu
  Date : 2018-05-25 06:24:59
  Hash : 9d6c7364
  Message : Update to libepoxy 1.5.2. ok aja@

• dist/libepoxy/test/wgl_per_context_funcptrs.c

• /*
   * Copyright © 2013 Intel Corporation
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the "Software"),
   * to deal in the Software without restriction, including without limitation
   * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   * and/or sell copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice (including the next
   * paragraph) shall be included in all copies or substantial portions of the
   * Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
   * IN THE SOFTWARE.
   */
  
  /**
   * @file wgl_per_context_funcptrs.c
   *
   * Tests that epoxy works correctly when wglGetProcAddress() returns
   * different function pointers for different contexts.
   *
   * wgl allows that to be the case when the device or pixel format are
   * different.  We don't know if the underlying implementation actually
   * *will* return different function pointers, so force the issue by
   * overriding wglGetProcAddress() to return our function pointers with
   * magic behavior.  This way we can test epoxy's implementation
   * regardless.
   */
  
  #include <stdio.h>
  #include <assert.h>
  
  #include "wgl_common.h"
  #include <epoxy/gl.h>
  
  #define CREATESHADER_CTX1_VAL 1001
  #define CREATESHADER_CTX2_VAL 1002
  
  static HGLRC ctx1, ctx2, current_context;
  static bool pass = true;
  
  #define OVERRIDE_API(type) __declspec(dllexport) type __stdcall
  
  OVERRIDE_API (GLuint) override_glCreateShader_ctx1(GLenum target);
  OVERRIDE_API (GLuint) override_glCreateShader_ctx2(GLenum target);
  OVERRIDE_API (PROC) override_wglGetProcAddress(LPCSTR name);
  
  OVERRIDE_API (GLuint)
  override_glCreateShader_ctx1(GLenum target)
  {
      if (current_context != ctx1) {
          fputs("ctx1 called while other context current\n", stderr);
          pass = false;
      }
      return CREATESHADER_CTX1_VAL;
  }
  
  OVERRIDE_API (GLuint)
  override_glCreateShader_ctx2(GLenum target)
  {
      if (current_context != ctx2) {
          fputs("ctx2 called while other context current\n", stderr);
          pass = false;
      }
      return CREATESHADER_CTX2_VAL;
  }
  
  OVERRIDE_API (PROC)
  override_wglGetProcAddress(LPCSTR name)
  {
      assert(strcmp(name, "glCreateShader") == 0);
  
      if (current_context == ctx1) {
          return (PROC)override_glCreateShader_ctx1;
      } else {
          assert(current_context == ctx2);
          return (PROC)override_glCreateShader_ctx2;
      }
  }
  
  static void
  test_createshader(HDC hdc, HGLRC ctx)
  {
      GLuint shader, expected;
      int ctxnum;
  
      wglMakeCurrent(hdc, ctx);
      current_context = ctx;
  
      /* Install our GPA override so we can force per-context function
       * pointers.
       */
      wglGetProcAddress = override_wglGetProcAddress;
  
      if (ctx == ctx1) {
          expected = CREATESHADER_CTX1_VAL;
          ctxnum = 1;
      } else {
          assert(ctx == ctx2);
          expected = CREATESHADER_CTX2_VAL;
          ctxnum = 2;
      }
  
      shader = glCreateShader(GL_FRAGMENT_SHADER);
      printf("ctx%d: Returned %d\n", ctxnum, shader);
      if (shader != expected) {
          fprintf(stderr, "  expected %d\n", expected);
          pass = false;
      }
  }
  
  static int
  test_function(HDC hdc)
  {
      ctx1 = wglCreateContext(hdc);
      ctx2 = wglCreateContext(hdc);
      if (!ctx1 || !ctx2) {
          fputs("Failed to create wgl contexts\n", stderr);
          return 1;
      }
  
      if (!wglMakeCurrent(hdc, ctx1)) {
          fputs("Failed to make context current\n", stderr);
          return 1;
      }
  
      if (epoxy_gl_version() < 20) {
          /* We could possibly do a 1.3 entrypoint or something instead. */
          fputs("Test relies on overriding a GL 2.0 entrypoint\n", stderr);
          return 77;
      }
  
      /* Force resolving epoxy_wglGetProcAddress. */
      wglGetProcAddress("glCreateShader");
  
      test_createshader(hdc, ctx1);
      test_createshader(hdc, ctx1);
      test_createshader(hdc, ctx2);
      test_createshader(hdc, ctx2);
      test_createshader(hdc, ctx1);
      test_createshader(hdc, ctx2);
  
      wglMakeCurrent(NULL, NULL);
      wglDeleteContext(ctx1);
      wglDeleteContext(ctx2);
  
      return !pass;
  }
  
  int
  main(int argc, char **argv)
  {
      make_window_and_test(test_function);
  
      /* UNREACHED */
      return 1;
  }