diff options
Diffstat (limited to 'vendor/github.com/go-gl/glfw/v3.3/glfw/glfw/src/osmesa_context.c')
| -rw-r--r-- | vendor/github.com/go-gl/glfw/v3.3/glfw/glfw/src/osmesa_context.c | 384 |
1 files changed, 384 insertions, 0 deletions
diff --git a/vendor/github.com/go-gl/glfw/v3.3/glfw/glfw/src/osmesa_context.c b/vendor/github.com/go-gl/glfw/v3.3/glfw/glfw/src/osmesa_context.c new file mode 100644 index 0000000..f29f9cd --- /dev/null +++ b/vendor/github.com/go-gl/glfw/v3.3/glfw/glfw/src/osmesa_context.c @@ -0,0 +1,384 @@ +//======================================================================== +// 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 (window->context.source != GLFW_OSMESA_CONTEXT_API) + { + _glfwInputError(GLFW_NO_WINDOW_CONTEXT, NULL); + 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 (window->context.source != GLFW_OSMESA_CONTEXT_API) + { + _glfwInputError(GLFW_NO_WINDOW_CONTEXT, NULL); + 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.source != GLFW_OSMESA_CONTEXT_API) + { + _glfwInputError(GLFW_NO_WINDOW_CONTEXT, NULL); + return NULL; + } + + return window->context.osmesa.handle; +} + |