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WGL: Fix count of displayable pixel formats 

We only care about displayable pixel formats (as defined in
WGL_ARB_pixel_format) for window context creation.

This changes pixel format enumeration to ignore non-displayable formats,
which are specified to be listed after displayable ones, by always using
the return value of DescribePixelFormat as the pixel format count.

(cherry picked from commit 2c0f34b60f)
This commit is contained in:
Camilla Löwy 2022-04-24 22:31:28 +02:00
parent 8b4f1ebbea
commit bd13f55ca8
1 changed files with 5 additions and 17 deletions
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22
src/wgl_context.c
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@ -73,18 +73,13 @@ static int choosePixelFormat(_GLFWwindow* window,
int attribs[40];
int values[sizeof(attribs) / sizeof(attribs[0])];
nativeCount = DescribePixelFormat(window->context.wgl.dc,
1,
sizeof(PIXELFORMATDESCRIPTOR),
NULL);
if (_glfw.wgl.ARB_pixel_format)
{
const int attrib = WGL_NUMBER_PIXEL_FORMATS_ARB;
if (!wglGetPixelFormatAttribivARB(window->context.wgl.dc,
1, 0, 1, &attrib, &nativeCount))
{
_glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
"WGL: Failed to retrieve pixel format attribute");
return 0;
}
addAttrib(WGL_SUPPORT_OPENGL_ARB);
addAttrib(WGL_DRAW_TO_WINDOW_ARB);
addAttrib(WGL_PIXEL_TYPE_ARB);
@ -122,13 +117,6 @@ static int choosePixelFormat(_GLFWwindow* window,
addAttrib(WGL_COLORSPACE_EXT);
}
}
else
{
nativeCount = DescribePixelFormat(window->context.wgl.dc,
1,
sizeof(PIXELFORMATDESCRIPTOR),
NULL);
}
usableConfigs = calloc(nativeCount, sizeof(_GLFWfbconfig));