ref: af837edda43873c1435e3ca1a54034ad7ee11893
dir: /external/glfw/src/osmesa_context.c/
//========================================================================
// GLFW 3.3 OSMesa - www.glfw.org
//------------------------------------------------------------------------
// Copyright (c) 2016 Google Inc.
// Copyright (c) 2016-2017 Camilla Löwy <elmindreda@glfw.org>
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would
// be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not
// be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source
// distribution.
//
//========================================================================
// Please use C89 style variable declarations in this file because VS 2010
//========================================================================
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "internal.h"
static void makeContextCurrentOSMesa(_GLFWwindow* window)
{
if (window)
{
int width, height;
_glfwPlatformGetFramebufferSize(window, &width, &height);
// Check to see if we need to allocate a new buffer
if ((window->context.osmesa.buffer == NULL) ||
(width != window->context.osmesa.width) ||
(height != window->context.osmesa.height))
{
free(window->context.osmesa.buffer);
// Allocate the new buffer (width * height * 8-bit RGBA)
window->context.osmesa.buffer = calloc(4, (size_t) width * height);
window->context.osmesa.width = width;
window->context.osmesa.height = height;
}
if (!OSMesaMakeCurrent(window->context.osmesa.handle,
window->context.osmesa.buffer,
GL_UNSIGNED_BYTE,
width, height))
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"OSMesa: Failed to make context current");
return;
}
}
_glfwPlatformSetTls(&_glfw.contextSlot, window);
}
static GLFWglproc getProcAddressOSMesa(const char* procname)
{
return (GLFWglproc) OSMesaGetProcAddress(procname);
}
static void destroyContextOSMesa(_GLFWwindow* window)
{
if (window->context.osmesa.handle)
{
OSMesaDestroyContext(window->context.osmesa.handle);
window->context.osmesa.handle = NULL;
}
if (window->context.osmesa.buffer)
{
free(window->context.osmesa.buffer);
window->context.osmesa.width = 0;
window->context.osmesa.height = 0;
}
}
static void swapBuffersOSMesa(_GLFWwindow* window)
{
// No double buffering on OSMesa
}
static void swapIntervalOSMesa(int interval)
{
// No swap interval on OSMesa
}
static int extensionSupportedOSMesa(const char* extension)
{
// OSMesa does not have extensions
return GLFW_FALSE;
}
//////////////////////////////////////////////////////////////////////////
////// GLFW internal API //////
//////////////////////////////////////////////////////////////////////////
GLFWbool _glfwInitOSMesa(void)
{
int i;
const char* sonames[] =
{
#if defined(_GLFW_OSMESA_LIBRARY)
_GLFW_OSMESA_LIBRARY,
#elif defined(_WIN32)
"libOSMesa.dll",
"OSMesa.dll",
#elif defined(__APPLE__)
"libOSMesa.8.dylib",
#elif defined(__CYGWIN__)
"libOSMesa-8.so",
#else
"libOSMesa.so.8",
"libOSMesa.so.6",
#endif
NULL
};
if (_glfw.osmesa.handle)
return GLFW_TRUE;
for (i = 0; sonames[i]; i++)
{
_glfw.osmesa.handle = _glfw_dlopen(sonames[i]);
if (_glfw.osmesa.handle)
break;
}
if (!_glfw.osmesa.handle)
{
_glfwInputError(GLFW_API_UNAVAILABLE, "OSMesa: Library not found");
return GLFW_FALSE;
}
_glfw.osmesa.CreateContextExt = (PFN_OSMesaCreateContextExt)
_glfw_dlsym(_glfw.osmesa.handle, "OSMesaCreateContextExt");
_glfw.osmesa.CreateContextAttribs = (PFN_OSMesaCreateContextAttribs)
_glfw_dlsym(_glfw.osmesa.handle, "OSMesaCreateContextAttribs");
_glfw.osmesa.DestroyContext = (PFN_OSMesaDestroyContext)
_glfw_dlsym(_glfw.osmesa.handle, "OSMesaDestroyContext");
_glfw.osmesa.MakeCurrent = (PFN_OSMesaMakeCurrent)
_glfw_dlsym(_glfw.osmesa.handle, "OSMesaMakeCurrent");
_glfw.osmesa.GetColorBuffer = (PFN_OSMesaGetColorBuffer)
_glfw_dlsym(_glfw.osmesa.handle, "OSMesaGetColorBuffer");
_glfw.osmesa.GetDepthBuffer = (PFN_OSMesaGetDepthBuffer)
_glfw_dlsym(_glfw.osmesa.handle, "OSMesaGetDepthBuffer");
_glfw.osmesa.GetProcAddress = (PFN_OSMesaGetProcAddress)
_glfw_dlsym(_glfw.osmesa.handle, "OSMesaGetProcAddress");
if (!_glfw.osmesa.CreateContextExt ||
!_glfw.osmesa.DestroyContext ||
!_glfw.osmesa.MakeCurrent ||
!_glfw.osmesa.GetColorBuffer ||
!_glfw.osmesa.GetDepthBuffer ||
!_glfw.osmesa.GetProcAddress)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"OSMesa: Failed to load required entry points");
_glfwTerminateOSMesa();
return GLFW_FALSE;
}
return GLFW_TRUE;
}
void _glfwTerminateOSMesa(void)
{
if (_glfw.osmesa.handle)
{
_glfw_dlclose(_glfw.osmesa.handle);
_glfw.osmesa.handle = NULL;
}
}
#define setAttrib(a, v) \
{ \
assert(((size_t) index + 1) < sizeof(attribs) / sizeof(attribs[0])); \
attribs[index++] = a; \
attribs[index++] = v; \
}
GLFWbool _glfwCreateContextOSMesa(_GLFWwindow* window,
const _GLFWctxconfig* ctxconfig,
const _GLFWfbconfig* fbconfig)
{
OSMesaContext share = NULL;
const int accumBits = fbconfig->accumRedBits +
fbconfig->accumGreenBits +
fbconfig->accumBlueBits +
fbconfig->accumAlphaBits;
if (ctxconfig->client == GLFW_OPENGL_ES_API)
{
_glfwInputError(GLFW_API_UNAVAILABLE,
"OSMesa: OpenGL ES is not available on OSMesa");
return GLFW_FALSE;
}
if (ctxconfig->share)
share = ctxconfig->share->context.osmesa.handle;
if (OSMesaCreateContextAttribs)
{
int index = 0, attribs[40];
setAttrib(OSMESA_FORMAT, OSMESA_RGBA);
setAttrib(OSMESA_DEPTH_BITS, fbconfig->depthBits);
setAttrib(OSMESA_STENCIL_BITS, fbconfig->stencilBits);
setAttrib(OSMESA_ACCUM_BITS, accumBits);
if (ctxconfig->profile == GLFW_OPENGL_CORE_PROFILE)
{
setAttrib(OSMESA_PROFILE, OSMESA_CORE_PROFILE);
}
else if (ctxconfig->profile == GLFW_OPENGL_COMPAT_PROFILE)
{
setAttrib(OSMESA_PROFILE, OSMESA_COMPAT_PROFILE);
}
if (ctxconfig->major != 1 || ctxconfig->minor != 0)
{
setAttrib(OSMESA_CONTEXT_MAJOR_VERSION, ctxconfig->major);
setAttrib(OSMESA_CONTEXT_MINOR_VERSION, ctxconfig->minor);
}
if (ctxconfig->forward)
{
_glfwInputError(GLFW_VERSION_UNAVAILABLE,
"OSMesa: Forward-compatible contexts not supported");
return GLFW_FALSE;
}
setAttrib(0, 0);
window->context.osmesa.handle =
OSMesaCreateContextAttribs(attribs, share);
}
else
{
if (ctxconfig->profile)
{
_glfwInputError(GLFW_VERSION_UNAVAILABLE,
"OSMesa: OpenGL profiles unavailable");
return GLFW_FALSE;
}
window->context.osmesa.handle =
OSMesaCreateContextExt(OSMESA_RGBA,
fbconfig->depthBits,
fbconfig->stencilBits,
accumBits,
share);
}
if (window->context.osmesa.handle == NULL)
{
_glfwInputError(GLFW_VERSION_UNAVAILABLE,
"OSMesa: Failed to create context");
return GLFW_FALSE;
}
window->context.makeCurrent = makeContextCurrentOSMesa;
window->context.swapBuffers = swapBuffersOSMesa;
window->context.swapInterval = swapIntervalOSMesa;
window->context.extensionSupported = extensionSupportedOSMesa;
window->context.getProcAddress = getProcAddressOSMesa;
window->context.destroy = destroyContextOSMesa;
return GLFW_TRUE;
}
#undef setAttrib
//////////////////////////////////////////////////////////////////////////
////// GLFW native API //////
//////////////////////////////////////////////////////////////////////////
GLFWAPI int glfwGetOSMesaColorBuffer(GLFWwindow* handle, int* width,
int* height, int* format, void** buffer)
{
void* mesaBuffer;
GLint mesaWidth, mesaHeight, mesaFormat;
_GLFWwindow* window = (_GLFWwindow*) handle;
assert(window != NULL);
_GLFW_REQUIRE_INIT_OR_RETURN(GLFW_FALSE);
if (!OSMesaGetColorBuffer(window->context.osmesa.handle,
&mesaWidth, &mesaHeight,
&mesaFormat, &mesaBuffer))
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"OSMesa: Failed to retrieve color buffer");
return GLFW_FALSE;
}
if (width)
*width = mesaWidth;
if (height)
*height = mesaHeight;
if (format)
*format = mesaFormat;
if (buffer)
*buffer = mesaBuffer;
return GLFW_TRUE;
}
GLFWAPI int glfwGetOSMesaDepthBuffer(GLFWwindow* handle,
int* width, int* height,
int* bytesPerValue,
void** buffer)
{
void* mesaBuffer;
GLint mesaWidth, mesaHeight, mesaBytes;
_GLFWwindow* window = (_GLFWwindow*) handle;
assert(window != NULL);
_GLFW_REQUIRE_INIT_OR_RETURN(GLFW_FALSE);
if (!OSMesaGetDepthBuffer(window->context.osmesa.handle,
&mesaWidth, &mesaHeight,
&mesaBytes, &mesaBuffer))
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"OSMesa: Failed to retrieve depth buffer");
return GLFW_FALSE;
}
if (width)
*width = mesaWidth;
if (height)
*height = mesaHeight;
if (bytesPerValue)
*bytesPerValue = mesaBytes;
if (buffer)
*buffer = mesaBuffer;
return GLFW_TRUE;
}
GLFWAPI OSMesaContext glfwGetOSMesaContext(GLFWwindow* handle)
{
_GLFWwindow* window = (_GLFWwindow*) handle;
_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
if (window->context.client == GLFW_NO_API)
{
_glfwInputError(GLFW_NO_WINDOW_CONTEXT, NULL);
return NULL;
}
return window->context.osmesa.handle;
}