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/*
* 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;
}
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