gl_common: split into platform specific files

Do this instead of stuffing all x11/cocoa/win32/wayland specific code
into gl_common.c. The cocoa specific parts could probably go directly
into cocoa_common.m, possibly same with wayland.

Also redo how the list of backends is managed. Get rid of the GLTYPE_
constants. Instead of having a big switch() on GLTYPE_, each backend
entry has a function pointer to setup the MPGLContext callback (e.g.
mpgl_set_backend_x11()).

1 files changed, 218 insertions, 0 deletions

diff --git a/video/out/gl_w32.c b/video/out/gl_w32.c
new file mode 100644
index 0000000000..81547f019d
--- /dev/null
+++ b/video/out/gl_w32.c
@@ -0,0 +1,218 @@
+/*
+ * MPlayer is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * MPlayer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with MPlayer; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * You can alternatively redistribute this file and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ */
+
+#include <windows.h>
+#include "w32_common.h"
+#include "gl_common.h"
+
+struct w32_context {
+    HGLRC context;
+};
+
+static void *w32gpa(const GLubyte *procName)
+{
+    HMODULE oglmod;
+    void *res = wglGetProcAddress(procName);
+    if (res)
+        return res;
+    oglmod = GetModuleHandle("opengl32.dll");
+    return GetProcAddress(oglmod, procName);
+}
+
+static bool create_context_w32_old(struct MPGLContext *ctx)
+{
+    GL *gl = ctx->gl;
+
+    struct w32_context *w32_ctx = ctx->priv;
+    HGLRC *context = &w32_ctx->context;
+
+    if (*context) {
+        gl->Finish();   // supposedly to prevent flickering
+        return true;
+    }
+
+    HWND win = ctx->vo->w32->window;
+    HDC windc = GetDC(win);
+    bool res = false;
+
+    HGLRC new_context = wglCreateContext(windc);
+    if (!new_context) {
+        mp_msg(MSGT_VO, MSGL_FATAL, "[gl] Could not create GL context!\n");
+        goto out;
+    }
+
+    if (!wglMakeCurrent(windc, new_context)) {
+        mp_msg(MSGT_VO, MSGL_FATAL, "[gl] Could not set GL context!\n");
+        wglDeleteContext(new_context);
+        goto out;
+    }
+
+    *context = new_context;
+
+    mpgl_load_functions(ctx->gl, w32gpa, NULL);
+    res = true;
+
+out:
+    ReleaseDC(win, windc);
+    return res;
+}
+
+static bool create_context_w32_gl3(struct MPGLContext *ctx)
+{
+    struct w32_context *w32_ctx = ctx->priv;
+    HGLRC *context = &w32_ctx->context;
+
+    if (*context) // reuse existing context
+        return true; // not reusing it breaks gl3!
+
+    HWND win = ctx->vo->w32->window;
+    HDC windc = GetDC(win);
+    HGLRC new_context = 0;
+
+    new_context = wglCreateContext(windc);
+    if (!new_context) {
+        mp_msg(MSGT_VO, MSGL_FATAL, "[gl] Could not create GL context!\n");
+        return false;
+    }
+
+    // set context
+    if (!wglMakeCurrent(windc, new_context)) {
+        mp_msg(MSGT_VO, MSGL_FATAL, "[gl] Could not set GL context!\n");
+        goto out;
+    }
+
+    const char *(GLAPIENTRY *wglGetExtensionsStringARB)(HDC hdc)
+        = w32gpa((const GLubyte*)"wglGetExtensionsStringARB");
+
+    if (!wglGetExtensionsStringARB)
+        goto unsupported;
+
+    const char *wgl_exts = wglGetExtensionsStringARB(windc);
+    if (!strstr(wgl_exts, "WGL_ARB_create_context"))
+        goto unsupported;
+
+    HGLRC (GLAPIENTRY *wglCreateContextAttribsARB)(HDC hDC, HGLRC hShareContext,
+                                                   const int *attribList)
+        = w32gpa((const GLubyte*)"wglCreateContextAttribsARB");
+
+    if (!wglCreateContextAttribsARB)
+        goto unsupported;
+
+    int gl_version = ctx->requested_gl_version;
+    int attribs[] = {
+        WGL_CONTEXT_MAJOR_VERSION_ARB, MPGL_VER_GET_MAJOR(gl_version),
+        WGL_CONTEXT_MINOR_VERSION_ARB, MPGL_VER_GET_MINOR(gl_version),
+        WGL_CONTEXT_FLAGS_ARB, 0,
+        WGL_CONTEXT_PROFILE_MASK_ARB, WGL_CONTEXT_CORE_PROFILE_BIT_ARB,
+        0
+    };
+
+    *context = wglCreateContextAttribsARB(windc, 0, attribs);
+    if (! *context) {
+        // NVidia, instead of ignoring WGL_CONTEXT_FLAGS_ARB, will error out if
+        // it's present on pre-3.2 contexts.
+        // Remove it from attribs and retry the context creation.
+        attribs[6] = attribs[7] = 0;
+        *context = wglCreateContextAttribsARB(windc, 0, attribs);
+    }
+    if (! *context) {
+        int err = GetLastError();
+        mp_msg(MSGT_VO, MSGL_FATAL, "[gl] Could not create an OpenGL 3.x"
+                                    " context: error 0x%x\n", err);
+        goto out;
+    }
+
+    wglMakeCurrent(NULL, NULL);
+    wglDeleteContext(new_context);
+
+    if (!wglMakeCurrent(windc, *context)) {
+        mp_msg(MSGT_VO, MSGL_FATAL, "[gl] Could not set GL3 context!\n");
+        wglDeleteContext(*context);
+        return false;
+    }
+
+    /* update function pointers */
+    mpgl_load_functions(ctx->gl, w32gpa, NULL);
+
+    int pfmt = GetPixelFormat(windc);
+    PIXELFORMATDESCRIPTOR pfd;
+    if (DescribePixelFormat(windc, pfmt, sizeof(PIXELFORMATDESCRIPTOR), &pfd)) {
+        ctx->depth_r = pfd.cRedBits;
+        ctx->depth_g = pfd.cGreenBits;
+        ctx->depth_b = pfd.cBlueBits;
+    }
+
+    return true;
+
+unsupported:
+    mp_msg(MSGT_VO, MSGL_ERR, "[gl] The current OpenGL implementation does"
+                              " not support OpenGL 3.x \n");
+out:
+    wglDeleteContext(new_context);
+    return false;
+}
+
+static bool config_window_w32(struct MPGLContext *ctx, uint32_t d_width,
+                              uint32_t d_height, uint32_t flags)
+{
+    if (!vo_w32_config(ctx->vo, d_width, d_height, flags))
+        return false;
+
+    bool success = false;
+    if (ctx->requested_gl_version >= MPGL_VER(3, 0))
+        success = create_context_w32_gl3(ctx);
+    if (!success)
+        success = create_context_w32_old(ctx);
+    return success;
+}
+
+static void releaseGlContext_w32(MPGLContext *ctx)
+{
+    struct w32_context *w32_ctx = ctx->priv;
+    HGLRC *context = &w32_ctx->context;
+    if (*context) {
+        wglMakeCurrent(0, 0);
+        wglDeleteContext(*context);
+    }
+    *context = 0;
+}
+
+static void swapGlBuffers_w32(MPGLContext *ctx)
+{
+    HDC vo_hdc = GetDC(ctx->vo->w32->window);
+    SwapBuffers(vo_hdc);
+    ReleaseDC(ctx->vo->w32->window, vo_hdc);
+}
+
+void mpgl_set_backend_w32(MPGLContext *ctx)
+{
+    ctx->priv = talloc_zero(ctx, struct w32_context);
+    ctx->config_window = config_window_w32;
+    ctx->releaseGlContext = releaseGlContext_w32;
+    ctx->swapGlBuffers = swapGlBuffers_w32;
+    ctx->update_xinerama_info = w32_update_xinerama_info;
+    ctx->border = vo_w32_border;
+    ctx->check_events = vo_w32_check_events;
+    ctx->fullscreen = vo_w32_fullscreen;
+    ctx->ontop = vo_w32_ontop;
+    ctx->vo_init = vo_w32_init;
+    ctx->vo_uninit = vo_w32_uninit;
+}