mirror of
https://github.com/hajimehoshi/ebiten.git
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362 lines
10 KiB
C
362 lines
10 KiB
C
// SPDX-License-Identifier: Apache-2.0
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// SPDX-FileCopyrightText: 2016 Google Inc.
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// SPDX-FileCopyrightText: 2016-2017 Camilla Löwy <elmindreda@glfw.org>
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// SPDX-FileCopyrightText: 2023 The Ebitengine Authors
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//go:build darwin || freebsd || linux || netbsd || openbsd
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include "internal.h"
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static void makeContextCurrentOSMesa(_GLFWwindow* window)
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{
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if (window)
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{
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int width, height;
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_glfwPlatformGetFramebufferSize(window, &width, &height);
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// Check to see if we need to allocate a new buffer
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if ((window->context.osmesa.buffer == NULL) ||
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(width != window->context.osmesa.width) ||
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(height != window->context.osmesa.height))
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{
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free(window->context.osmesa.buffer);
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// Allocate the new buffer (width * height * 8-bit RGBA)
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window->context.osmesa.buffer = calloc(4, (size_t) width * height);
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window->context.osmesa.width = width;
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window->context.osmesa.height = height;
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}
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if (!OSMesaMakeCurrent(window->context.osmesa.handle,
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window->context.osmesa.buffer,
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GL_UNSIGNED_BYTE,
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width, height))
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{
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_glfwInputError(GLFW_PLATFORM_ERROR,
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"OSMesa: Failed to make context current");
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return;
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}
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}
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_glfwPlatformSetTls(&_glfw.contextSlot, window);
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}
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static GLFWglproc getProcAddressOSMesa(const char* procname)
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{
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return (GLFWglproc) OSMesaGetProcAddress(procname);
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}
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static void destroyContextOSMesa(_GLFWwindow* window)
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{
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if (window->context.osmesa.handle)
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{
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OSMesaDestroyContext(window->context.osmesa.handle);
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window->context.osmesa.handle = NULL;
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}
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if (window->context.osmesa.buffer)
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{
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free(window->context.osmesa.buffer);
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window->context.osmesa.width = 0;
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window->context.osmesa.height = 0;
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}
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}
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static void swapBuffersOSMesa(_GLFWwindow* window)
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{
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// No double buffering on OSMesa
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}
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static void swapIntervalOSMesa(int interval)
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{
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// No swap interval on OSMesa
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}
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static int extensionSupportedOSMesa(const char* extension)
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{
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// OSMesa does not have extensions
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return GLFW_FALSE;
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}
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//////////////////////////////////////////////////////////////////////////
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////// GLFW internal API //////
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//////////////////////////////////////////////////////////////////////////
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GLFWbool _glfwInitOSMesa(void)
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{
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int i;
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const char* sonames[] =
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{
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#if defined(_GLFW_OSMESA_LIBRARY)
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_GLFW_OSMESA_LIBRARY,
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#elif defined(__APPLE__)
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"libOSMesa.8.dylib",
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#elif defined(__CYGWIN__)
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"libOSMesa-8.so",
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#elif defined(__OpenBSD__) || defined(__NetBSD__)
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"libOSMesa.so",
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#else
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"libOSMesa.so.8",
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"libOSMesa.so.6",
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#endif
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NULL
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};
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if (_glfw.osmesa.handle)
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return GLFW_TRUE;
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for (i = 0; sonames[i]; i++)
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{
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_glfw.osmesa.handle = _glfw_dlopen(sonames[i]);
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if (_glfw.osmesa.handle)
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break;
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}
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if (!_glfw.osmesa.handle)
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{
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_glfwInputError(GLFW_API_UNAVAILABLE, "OSMesa: Library not found");
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return GLFW_FALSE;
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}
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_glfw.osmesa.CreateContextExt = (PFN_OSMesaCreateContextExt)
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_glfw_dlsym(_glfw.osmesa.handle, "OSMesaCreateContextExt");
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_glfw.osmesa.CreateContextAttribs = (PFN_OSMesaCreateContextAttribs)
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_glfw_dlsym(_glfw.osmesa.handle, "OSMesaCreateContextAttribs");
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_glfw.osmesa.DestroyContext = (PFN_OSMesaDestroyContext)
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_glfw_dlsym(_glfw.osmesa.handle, "OSMesaDestroyContext");
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_glfw.osmesa.MakeCurrent = (PFN_OSMesaMakeCurrent)
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_glfw_dlsym(_glfw.osmesa.handle, "OSMesaMakeCurrent");
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_glfw.osmesa.GetColorBuffer = (PFN_OSMesaGetColorBuffer)
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_glfw_dlsym(_glfw.osmesa.handle, "OSMesaGetColorBuffer");
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_glfw.osmesa.GetDepthBuffer = (PFN_OSMesaGetDepthBuffer)
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_glfw_dlsym(_glfw.osmesa.handle, "OSMesaGetDepthBuffer");
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_glfw.osmesa.GetProcAddress = (PFN_OSMesaGetProcAddress)
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_glfw_dlsym(_glfw.osmesa.handle, "OSMesaGetProcAddress");
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if (!_glfw.osmesa.CreateContextExt ||
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!_glfw.osmesa.DestroyContext ||
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!_glfw.osmesa.MakeCurrent ||
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!_glfw.osmesa.GetColorBuffer ||
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!_glfw.osmesa.GetDepthBuffer ||
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!_glfw.osmesa.GetProcAddress)
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{
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_glfwInputError(GLFW_PLATFORM_ERROR,
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"OSMesa: Failed to load required entry points");
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_glfwTerminateOSMesa();
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return GLFW_FALSE;
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}
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return GLFW_TRUE;
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}
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void _glfwTerminateOSMesa(void)
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{
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if (_glfw.osmesa.handle)
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{
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_glfw_dlclose(_glfw.osmesa.handle);
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_glfw.osmesa.handle = NULL;
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}
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}
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#define setAttrib(a, v) \
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{ \
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assert(((size_t) index + 1) < sizeof(attribs) / sizeof(attribs[0])); \
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attribs[index++] = a; \
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attribs[index++] = v; \
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}
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GLFWbool _glfwCreateContextOSMesa(_GLFWwindow* window,
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const _GLFWctxconfig* ctxconfig,
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const _GLFWfbconfig* fbconfig)
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{
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OSMesaContext share = NULL;
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const int accumBits = fbconfig->accumRedBits +
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fbconfig->accumGreenBits +
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fbconfig->accumBlueBits +
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fbconfig->accumAlphaBits;
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if (ctxconfig->client == GLFW_OPENGL_ES_API)
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{
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_glfwInputError(GLFW_API_UNAVAILABLE,
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"OSMesa: OpenGL ES is not available on OSMesa");
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return GLFW_FALSE;
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}
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if (ctxconfig->share)
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share = ctxconfig->share->context.osmesa.handle;
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if (OSMesaCreateContextAttribs)
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{
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int index = 0, attribs[40];
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setAttrib(OSMESA_FORMAT, OSMESA_RGBA);
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setAttrib(OSMESA_DEPTH_BITS, fbconfig->depthBits);
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setAttrib(OSMESA_STENCIL_BITS, fbconfig->stencilBits);
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setAttrib(OSMESA_ACCUM_BITS, accumBits);
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if (ctxconfig->profile == GLFW_OPENGL_CORE_PROFILE)
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{
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setAttrib(OSMESA_PROFILE, OSMESA_CORE_PROFILE);
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}
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else if (ctxconfig->profile == GLFW_OPENGL_COMPAT_PROFILE)
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{
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setAttrib(OSMESA_PROFILE, OSMESA_COMPAT_PROFILE);
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}
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if (ctxconfig->major != 1 || ctxconfig->minor != 0)
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{
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setAttrib(OSMESA_CONTEXT_MAJOR_VERSION, ctxconfig->major);
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setAttrib(OSMESA_CONTEXT_MINOR_VERSION, ctxconfig->minor);
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}
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if (ctxconfig->forward)
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{
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_glfwInputError(GLFW_VERSION_UNAVAILABLE,
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"OSMesa: Forward-compatible contexts not supported");
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return GLFW_FALSE;
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}
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setAttrib(0, 0);
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window->context.osmesa.handle =
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OSMesaCreateContextAttribs(attribs, share);
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}
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else
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{
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if (ctxconfig->profile)
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{
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_glfwInputError(GLFW_VERSION_UNAVAILABLE,
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"OSMesa: OpenGL profiles unavailable");
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return GLFW_FALSE;
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}
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window->context.osmesa.handle =
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OSMesaCreateContextExt(OSMESA_RGBA,
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fbconfig->depthBits,
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fbconfig->stencilBits,
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accumBits,
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share);
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}
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if (window->context.osmesa.handle == NULL)
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{
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_glfwInputError(GLFW_VERSION_UNAVAILABLE,
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"OSMesa: Failed to create context");
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return GLFW_FALSE;
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}
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window->context.makeCurrent = makeContextCurrentOSMesa;
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window->context.swapBuffers = swapBuffersOSMesa;
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window->context.swapInterval = swapIntervalOSMesa;
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window->context.extensionSupported = extensionSupportedOSMesa;
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window->context.getProcAddress = getProcAddressOSMesa;
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window->context.destroy = destroyContextOSMesa;
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return GLFW_TRUE;
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}
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#undef setAttrib
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//////////////////////////////////////////////////////////////////////////
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////// GLFW native API //////
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//////////////////////////////////////////////////////////////////////////
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GLFWAPI int glfwGetOSMesaColorBuffer(GLFWwindow* handle, int* width,
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int* height, int* format, void** buffer)
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{
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void* mesaBuffer;
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GLint mesaWidth, mesaHeight, mesaFormat;
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_GLFWwindow* window = (_GLFWwindow*) handle;
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assert(window != NULL);
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_GLFW_REQUIRE_INIT_OR_RETURN(GLFW_FALSE);
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if (window->context.source != GLFW_OSMESA_CONTEXT_API)
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{
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_glfwInputError(GLFW_NO_WINDOW_CONTEXT, NULL);
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return GLFW_FALSE;
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}
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if (!OSMesaGetColorBuffer(window->context.osmesa.handle,
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&mesaWidth, &mesaHeight,
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&mesaFormat, &mesaBuffer))
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{
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_glfwInputError(GLFW_PLATFORM_ERROR,
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"OSMesa: Failed to retrieve color buffer");
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return GLFW_FALSE;
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}
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if (width)
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*width = mesaWidth;
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if (height)
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*height = mesaHeight;
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if (format)
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*format = mesaFormat;
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if (buffer)
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*buffer = mesaBuffer;
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return GLFW_TRUE;
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}
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GLFWAPI int glfwGetOSMesaDepthBuffer(GLFWwindow* handle,
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int* width, int* height,
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int* bytesPerValue,
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void** buffer)
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{
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void* mesaBuffer;
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GLint mesaWidth, mesaHeight, mesaBytes;
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_GLFWwindow* window = (_GLFWwindow*) handle;
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assert(window != NULL);
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_GLFW_REQUIRE_INIT_OR_RETURN(GLFW_FALSE);
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if (window->context.source != GLFW_OSMESA_CONTEXT_API)
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{
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_glfwInputError(GLFW_NO_WINDOW_CONTEXT, NULL);
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return GLFW_FALSE;
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}
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if (!OSMesaGetDepthBuffer(window->context.osmesa.handle,
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&mesaWidth, &mesaHeight,
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&mesaBytes, &mesaBuffer))
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{
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_glfwInputError(GLFW_PLATFORM_ERROR,
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"OSMesa: Failed to retrieve depth buffer");
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return GLFW_FALSE;
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}
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if (width)
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*width = mesaWidth;
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if (height)
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*height = mesaHeight;
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if (bytesPerValue)
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*bytesPerValue = mesaBytes;
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if (buffer)
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*buffer = mesaBuffer;
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return GLFW_TRUE;
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}
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GLFWAPI OSMesaContext glfwGetOSMesaContext(GLFWwindow* handle)
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{
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_GLFWwindow* window = (_GLFWwindow*) handle;
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_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
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if (window->context.source != GLFW_OSMESA_CONTEXT_API)
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{
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_glfwInputError(GLFW_NO_WINDOW_CONTEXT, NULL);
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return NULL;
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}
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return window->context.osmesa.handle;
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}
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