summaryrefslogtreecommitdiff
path: root/common/headless_view.cpp
blob: cd8ee685d55eeb852de3aa916251de4fe44fd315 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
#include "headless_view.hpp"
#include "headless_display.hpp"

#include <stdexcept>

namespace mbgl {

HeadlessView::HeadlessView() : display_(new HeadlessDisplay()) {
    createContext();
}

HeadlessView::HeadlessView(HeadlessDisplay *display)
    : display_(display) {
    createContext();
}

void HeadlessView::createContext() {
#if MBGL_USE_CGL
    CGLError error = CGLCreateContext(display_->pixelFormat, NULL, &gl_context);
    if (error) {
        fprintf(stderr, "Error creating GL context object\n");
        return;
    }

    error = CGLEnable(gl_context, kCGLCEMPEngine);
    if (error != kCGLNoError ) {
        fprintf(stderr, "Error enabling OpenGL multithreading\n");
        return;
    }
#endif

#if MBGL_USE_GLX
    x_display = display_->x_display;
    x_info = display_->x_info;

    gl_context = glXCreateContext(x_display, x_info, 0, GL_TRUE);
    if (gl_context == nullptr) {
        throw std::runtime_error("Error creating GL context object");
    }
#endif
}

void HeadlessView::resize(uint16_t width, uint16_t height, float pixelRatio) {
    clear_buffers();

    width *= pixelRatio;
    height *= pixelRatio;

#if MBGL_USE_CGL
    make_active();

    // Create depth/stencil buffer
    glGenRenderbuffersEXT(1, &fbo_depth_stencil);
    glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, fbo_depth_stencil);
    glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH24_STENCIL8_EXT, width, height);
    glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, 0);

    glGenRenderbuffersEXT(1, &fbo_color);
    glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, fbo_color);
    glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGBA8, width, height);
    glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, 0);

    glGenFramebuffersEXT(1, &fbo);
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo);

    glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_RENDERBUFFER_EXT, fbo_color);
    glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER_EXT, fbo_depth_stencil);

    GLenum status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);

    if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
        fprintf(stderr, "Couldn't create framebuffer: ");
        switch (status) {
            case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT: fprintf(stderr, "incomplete attachment\n"); break;
            case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT: fprintf(stderr, "incomplete missing attachment\n"); break;
            case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT: fprintf(stderr, "incomplete dimensions\n"); break;
            case GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT: fprintf(stderr, "incomplete formats\n"); break;
            case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT: fprintf(stderr, "incomplete draw buffer\n"); break;
            case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT: fprintf(stderr, "incomplete read buffer\n"); break;
            case GL_FRAMEBUFFER_UNSUPPORTED: fprintf(stderr, "unsupported\n"); break;
            default: fprintf(stderr, "other\n"); break;
        }
        return;
    }

    make_inactive();
#endif

#if MBGL_USE_GLX
    x_pixmap = XCreatePixmap(x_display, DefaultRootWindow(x_display), width, height, 32);
    glx_pixmap = glXCreateGLXPixmap(x_display, x_info, x_pixmap);
#endif
}

void HeadlessView::clear_buffers() {
#if MBGL_USE_CGL
    make_active();

    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);

    if (fbo) {
        glDeleteFramebuffersEXT(1, &fbo);
        fbo = 0;
    }

    if (fbo_color) {
        glDeleteTextures(1, &fbo_color);
        fbo_color = 0;
    }

    if (fbo_depth_stencil) {
        glDeleteRenderbuffersEXT(1, &fbo_depth_stencil);
        fbo_depth_stencil = 0;
    }

    make_inactive();
#endif

#if MBGL_USE_GLX
    if (glx_pixmap) {
        glXDestroyGLXPixmap(x_display, glx_pixmap);
        glx_pixmap = 0;
    }

    if (x_pixmap) {
        XFreePixmap(x_display, x_pixmap);
        x_pixmap = 0;
    }

    make_inactive();
#endif
}

HeadlessView::~HeadlessView() {
    clear_buffers();

#if MBGL_USE_CGL
    CGLDestroyContext(gl_context);
#endif

#if MBGL_USE_GLX
    glXDestroyContext(x_display, gl_context);
#endif
}

void HeadlessView::notify_map_change(mbgl::MapChange /*change*/, mbgl::timestamp /*delay*/) {
    // no-op
}

void HeadlessView::make_active() {
#if MBGL_USE_CGL
    CGLError error = CGLSetCurrentContext(gl_context);
    if (error) {
        fprintf(stderr, "Switching OpenGL context failed\n");
    }
#endif

#if MBGL_USE_GLX
    if (!glXMakeCurrent(x_display, glx_pixmap, gl_context)) {
        fprintf(stderr, "Switching OpenGL context failed\n");
    }
#endif
}

void HeadlessView::make_inactive() {
#if MBGL_USE_CGL
    CGLError error = CGLSetCurrentContext(nullptr);
    if (error) {
        fprintf(stderr, "Removing OpenGL context failed\n");
    }
#endif

#if MBGL_USE_GLX
    if (!glXMakeCurrent(x_display, 0, NULL)) {
        fprintf(stderr, "Removing OpenGL context failed\n");
    }
#endif
}

void HeadlessView::swap() {}

unsigned int HeadlessView::root_fbo() {
#if MBGL_USE_CGL
    return fbo;
#endif

    return 0;
}

}