235 lines
8.2 KiB
C++
235 lines
8.2 KiB
C++
// Copyright (C) 2022 RozK
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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// Adapted from https://www.khronos.org/opengl/wiki/Tutorial:_OpenGL_3.0_Context_Creation_(GLX)
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#include "render_context.hpp"
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#include <cstdio>
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#include <cstring>
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#include <GLES3/gl32.h>
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#include <X11/Xlib.h>
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static Display * rk_display = nullptr;
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static Colormap rk_colormap = 0;
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static Window rk_window = 0;
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static GLXContext rk_context = nullptr;
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static bool rk_error_occured = false;
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#define GLX_CONTEXT_MAJOR_VERSION_ARB 0x2091
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#define GLX_CONTEXT_MINOR_VERSION_ARB 0x2092
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typedef GLXContext (*glXCreateContextAttribsARBProc)(Display *, GLXFBConfig, GLXContext, Bool, int const *);
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PFNGLDRAWELEMENTSINSTANCEDBASEINSTANCEPROC rk_DrawElementsInstancedBaseInstance = nullptr;
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PFNGLMULTIDRAWELEMENTSINDIRECTPROC rk_MultiDrawElementsIndirect = nullptr;
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static int const rk_visual_attribs[] = {
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GLX_X_RENDERABLE, True,
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GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
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GLX_RENDER_TYPE, GLX_RGBA_BIT,
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GLX_X_VISUAL_TYPE, GLX_TRUE_COLOR,
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GLX_RED_SIZE, 8,
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GLX_GREEN_SIZE, 8,
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GLX_BLUE_SIZE, 8,
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GLX_ALPHA_SIZE, 8,
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GLX_DEPTH_SIZE, 24,
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GLX_STENCIL_SIZE, 8,
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GLX_DOUBLEBUFFER, True,
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None
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};
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static int const rk_context_attribs[] = {
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GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
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GLX_CONTEXT_MINOR_VERSION_ARB, 2,
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GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_ES_PROFILE_BIT_EXT,
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None
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};
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static void rk_printf(
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char const * messsage) {
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printf("[GLX] %s\n", messsage);
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}
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static bool rk_extension_supported(
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char const * extlist,
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char const * extension) {
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char const * where = strchr(extension, ' ');
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if (where || *extension == '\0') {
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return false;
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}
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for (char const * start = extlist;;) {
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where = strstr(start, extension);
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if (!where) {
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break;
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}
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char const * const terminator = where + strlen(extension);
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if ((where == start || *(where - 1) == ' ') && (*terminator == ' ' || *terminator == '\0')) {
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return true;
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}
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start = terminator;
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}
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return false;
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}
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static int rk_error_handler(
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Display * display,
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XErrorEvent * event) {
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rk_error_occured = true;
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return 0;
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}
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rk_window_t rk_create_context(
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char const * name,
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unsigned width,
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unsigned height) {
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rk_display = XOpenDisplay(nullptr);
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if (!rk_display) {
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rk_printf("Failed to open X display.");
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return nullptr;
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}
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int glx_major, glx_minor;
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if (!glXQueryVersion(rk_display, &glx_major, &glx_minor) || (glx_major == 1 && glx_minor < 3) || glx_major < 1) {
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rk_printf("Invalid GLX version.");
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rk_destroy_context();
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return nullptr;
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}
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int fbcount;
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GLXFBConfig * const fbc = glXChooseFBConfig(rk_display, DefaultScreen(rk_display), rk_visual_attribs, &fbcount);
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if (!fbc) {
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rk_printf("Failed to retrieve framebuffer configs.");
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rk_destroy_context();
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return nullptr;
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}
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printf("[GLX] Found %d framebuffer configs.\n", fbcount);
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int best_fbc = -1;
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int best_num_samp = -1;
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for (int i = 0; i < fbcount; ++i) {
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XVisualInfo * vi = glXGetVisualFromFBConfig(rk_display, fbc[i]);
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if (vi) {
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int samp_buf, samples;
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glXGetFBConfigAttrib(rk_display, fbc[i], GLX_SAMPLE_BUFFERS, &samp_buf);
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glXGetFBConfigAttrib(rk_display, fbc[i], GLX_SAMPLES, &samples);
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if (best_fbc < 0 || (samp_buf && samples > best_num_samp)) {
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best_fbc = i;
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best_num_samp = samples;
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}
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XFree(vi);
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}
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}
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if (best_fbc == -1) {
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XFree(fbc);
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rk_printf("Failed to find a suitable framebuffer config.");
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rk_destroy_context();
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return nullptr;
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}
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GLXFBConfig const bestFbc = fbc[best_fbc];
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XFree(fbc);
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printf("[GLX] Select framebuffer config with %d samples.\n", best_num_samp);
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XVisualInfo * const vi = glXGetVisualFromFBConfig(rk_display, bestFbc);
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rk_colormap = XCreateColormap(rk_display, RootWindow(rk_display, vi->screen), vi->visual, AllocNone);
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XSetWindowAttributes swa;
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swa.colormap = rk_colormap;
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swa.background_pixmap = None;
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swa.border_pixel = 0;
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swa.event_mask = StructureNotifyMask;
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rk_window = XCreateWindow(rk_display, RootWindow(rk_display, vi->screen),
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0, 0, width, height, 0, vi->depth, InputOutput, vi->visual,
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CWBorderPixel | CWColormap | CWEventMask, &swa);
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if (!rk_window) {
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rk_printf("Failed to create window.");
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rk_destroy_context();
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return nullptr;
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}
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XFree(vi);
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XStoreName(rk_display, rk_window, name);
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XMapWindow(rk_display, rk_window);
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char const * const glx_exts = glXQueryExtensionsString(rk_display, DefaultScreen(rk_display));
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glXCreateContextAttribsARBProc const glXCreateContextAttribsARB =
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reinterpret_cast<glXCreateContextAttribsARBProc>(
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glXGetProcAddressARB(reinterpret_cast<GLubyte const *>("glXCreateContextAttribsARB")));
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rk_error_occured = false;
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int (*oldHandler)(Display *, XErrorEvent *) = XSetErrorHandler(&rk_error_handler);
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if (!rk_extension_supported(glx_exts, "GLX_ARB_create_context") || !glXCreateContextAttribsARB) {
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rk_printf("glXCreateContextAttribsARB() extension not found.");
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rk_destroy_context();
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return nullptr;
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} else {
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rk_context = glXCreateContextAttribsARB(rk_display, bestFbc, 0, True, rk_context_attribs);
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XSync(rk_display, False);
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if (rk_error_occured || !rk_context) {
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rk_printf("Failed to create context.");
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rk_destroy_context();
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return nullptr;
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}
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}
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XSetErrorHandler(oldHandler);
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if (!glXIsDirect(rk_display, rk_context)) {
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rk_printf("Warning: Rendering context is indirect.");
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}
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glXMakeCurrent(rk_display, rk_window, rk_context);
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char const * const gl_exts = reinterpret_cast<char const *>(glGetString(GL_EXTENSIONS));
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if (rk_extension_supported(gl_exts, "GL_EXT_base_instance")) {
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rk_DrawElementsInstancedBaseInstance =
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reinterpret_cast<PFNGLDRAWELEMENTSINSTANCEDBASEINSTANCEPROC>(
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glXGetProcAddressARB(reinterpret_cast<GLubyte const *>("DrawElementsInstancedBaseInstance")));
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if (rk_DrawElementsInstancedBaseInstance) {
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rk_printf("Using extension GL_EXT_base_instance::DrawElementsInstancedBaseInstance.");
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if (rk_extension_supported(gl_exts, "GL_EXT_multi_draw_indirect")) {
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rk_MultiDrawElementsIndirect =
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reinterpret_cast<PFNGLMULTIDRAWELEMENTSINDIRECTPROC>(
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glXGetProcAddressARB(reinterpret_cast<GLubyte const *>("MultiDrawElementsIndirectEXT")));
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if (rk_MultiDrawElementsIndirect) {
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rk_printf("Using extension GL_EXT_multi_draw_indirect::MultiDrawElementsIndirectEXT.");
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}
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}
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}
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}
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return reinterpret_cast<rk_window_t>(rk_window);
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}
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void rk_swap_buffers() {
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if (rk_display && rk_window) {
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glXSwapBuffers(rk_display, rk_window);
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}
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}
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void rk_destroy_context() {
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if (rk_display) {
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glXMakeCurrent(rk_display, 0, nullptr);
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if (rk_context) {
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glXDestroyContext(rk_display, rk_context);
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rk_context = nullptr;
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}
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if (rk_window) {
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XDestroyWindow(rk_display, rk_window);
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rk_window = 0;
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}
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if (rk_colormap) {
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XFreeColormap(rk_display, rk_colormap);
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rk_colormap = 0;
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}
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XCloseDisplay(rk_display);
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rk_display = nullptr;
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}
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}
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