Benjamin Franzke
14 years ago
parent
ac4326884b
commit
aabdce027f
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/*
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* Copyright © 2011 Benjamin Franzke |
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* |
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* Permission to use, copy, modify, distribute, and sell this software and its |
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* documentation for any purpose is hereby granted without fee, provided that |
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* the above copyright notice appear in all copies and that both that copyright |
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* notice and this permission notice appear in supporting documentation, and |
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* that the name of the copyright holders not be used in advertising or |
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* publicity pertaining to distribution of the software without specific, |
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* written prior permission. The copyright holders make no representations |
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* about the suitability of this software for any purpose. It is provided "as |
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* is" without express or implied warranty. |
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* |
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, |
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
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* OF THIS SOFTWARE. |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <stddef.h> |
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#include <stdint.h> |
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#include <stdbool.h> |
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#include <math.h> |
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#include <assert.h> |
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#include <fcntl.h> |
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#include <wayland-client.h> |
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#include <xf86drm.h> |
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#define GL_GLEXT_PROTOTYPES |
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#define EGL_EGLEXT_PROTOTYPES |
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#include <GLES2/gl2.h> |
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#include <GLES2/gl2ext.h> |
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#include <EGL/egl.h> |
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#include <EGL/eglext.h> |
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struct display { |
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struct wl_display *display; |
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struct { |
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struct wl_compositor *compositor; |
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struct wl_drm *drm; |
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} interface; |
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struct { |
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EGLDisplay dpy; |
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EGLContext ctx; |
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} egl; |
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struct { |
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int fd; |
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const char *device_name; |
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bool authenticated; |
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} drm; |
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uint32_t mask; |
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}; |
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struct window { |
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struct display *display; |
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struct { |
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int width, height; |
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} geometry; |
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struct { |
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GLuint fbo; |
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GLuint color_rbo; |
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GLuint program; |
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GLuint rotation_uniform; |
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GLuint pos; |
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GLuint col; |
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} gl; |
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struct { |
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struct wl_buffer *buffer; |
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struct wl_surface *surface; |
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EGLImageKHR image; |
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} drm_surface; |
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}; |
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static const char *vert_shader_text = |
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"uniform mat4 rotation;\n" |
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"attribute vec4 pos;\n" |
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"attribute vec4 color;\n" |
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"varying vec4 v_color;\n" |
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"void main() {\n" |
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" gl_Position = rotation * pos;\n" |
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" v_color = color;\n" |
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"}\n"; |
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static const char *frag_shader_text = |
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"varying vec4 v_color;\n" |
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"void main() {\n" |
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" gl_FragColor = v_color;\n" |
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"}\n"; |
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static void |
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init_egl(struct display *display) |
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{ |
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EGLint major, minor; |
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EGLBoolean ret; |
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display->egl.dpy = eglGetDRMDisplayMESA(display->drm.fd); |
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assert(display->egl.dpy); |
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ret = eglInitialize(display->egl.dpy, &major, &minor); |
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assert(ret == EGL_TRUE); |
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ret = eglBindAPI(EGL_OPENGL_API); |
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assert(ret == EGL_TRUE); |
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display->egl.ctx = eglCreateContext(display->egl.dpy, NULL, |
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EGL_NO_CONTEXT, NULL); |
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assert(display->egl.ctx); |
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ret = eglMakeCurrent(display->egl.dpy, NULL, NULL, display->egl.ctx); |
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assert(ret == EGL_TRUE); |
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} |
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static GLuint |
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create_shader(struct window *window, const char *source, GLenum shader_type) |
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{ |
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GLuint shader; |
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GLint status; |
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shader = glCreateShader(shader_type); |
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assert(shader != 0); |
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glShaderSource(shader, 1, (const char **) &source, NULL); |
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glCompileShader(shader); |
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glGetShaderiv(shader, GL_COMPILE_STATUS, &status); |
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if (!status) { |
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char log[1000]; |
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GLsizei len; |
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glGetShaderInfoLog(shader, 1000, &len, log); |
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fprintf(stderr, "Error: compiling %s: %*s\n", |
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shader_type == GL_VERTEX_SHADER ? "vertex" : "fragment", |
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len, log); |
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exit(1); |
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} |
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return shader; |
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} |
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static void |
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init_gl(struct window *window) |
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{ |
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GLfloat ar; |
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GLuint frag, vert; |
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GLint status; |
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glGenFramebuffers(1, &window->gl.fbo); |
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glBindFramebuffer(GL_FRAMEBUFFER, window->gl.fbo); |
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glGenRenderbuffers(1, &window->gl.color_rbo); |
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glViewport(0, 0, window->geometry.width, window->geometry.height); |
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ar = (GLfloat)window->geometry.width / (GLfloat)window->geometry.height; |
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frag = create_shader(window, frag_shader_text, GL_FRAGMENT_SHADER); |
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vert = create_shader(window, vert_shader_text, GL_VERTEX_SHADER); |
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window->gl.program = glCreateProgram(); |
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glAttachShader(window->gl.program, frag); |
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glAttachShader(window->gl.program, vert); |
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glLinkProgram(window->gl.program); |
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glGetProgramiv(window->gl.program, GL_LINK_STATUS, &status); |
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if (!status) { |
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char log[1000]; |
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GLsizei len; |
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glGetProgramInfoLog(window->gl.program, 1000, &len, log); |
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fprintf(stderr, "Error: linking:\n%*s\n", len, log); |
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exit(1); |
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} |
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glUseProgram(window->gl.program); |
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window->gl.pos = 0; |
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window->gl.pos = 1; |
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glBindAttribLocation(window->gl.program, window->gl.pos, "pos"); |
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glBindAttribLocation(window->gl.program, window->gl.col, "color"); |
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glLinkProgram(window->gl.program); |
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window->gl.rotation_uniform = |
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glGetUniformLocation(window->gl.program, "rotation"); |
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} |
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static void |
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create_surface(struct window *window) |
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{ |
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struct display *display = window->display; |
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struct wl_visual *visual; |
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EGLint name, stride; |
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EGLint image_attribs[] = { |
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EGL_WIDTH, 0, |
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EGL_HEIGHT, 0, |
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EGL_DRM_BUFFER_FORMAT_MESA, EGL_DRM_BUFFER_FORMAT_ARGB32_MESA, |
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EGL_DRM_BUFFER_USE_MESA, EGL_DRM_BUFFER_USE_SCANOUT_MESA, |
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EGL_NONE |
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}; |
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window->drm_surface.surface = |
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wl_compositor_create_surface(display->interface.compositor); |
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image_attribs[1] = window->geometry.width; |
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image_attribs[3] = window->geometry.height; |
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window->drm_surface.image = eglCreateDRMImageMESA(display->egl.dpy, |
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image_attribs); |
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eglExportDRMImageMESA(display->egl.dpy, window->drm_surface.image, |
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&name, NULL, &stride); |
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visual = wl_display_get_premultiplied_argb_visual(display->display); |
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window->drm_surface.buffer = |
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wl_drm_create_buffer(display->interface.drm, name, |
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window->geometry.width, |
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window->geometry.height, |
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stride, visual); |
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/* Process wl_drm_create_buffer. */ |
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wl_display_iterate(display->display, WL_DISPLAY_WRITABLE); |
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wl_surface_attach(window->drm_surface.surface, |
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window->drm_surface.buffer, 0, 0); |
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wl_surface_map_toplevel(window->drm_surface.surface); |
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glBindRenderbuffer(GL_RENDERBUFFER, window->gl.color_rbo); |
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glEGLImageTargetRenderbufferStorageOES(GL_RENDERBUFFER, |
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window->drm_surface.image); |
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glFramebufferRenderbuffer(GL_FRAMEBUFFER, |
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GL_COLOR_ATTACHMENT0, |
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GL_RENDERBUFFER, |
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window->gl.color_rbo); |
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assert(glCheckFramebufferStatus(GL_FRAMEBUFFER) == |
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GL_FRAMEBUFFER_COMPLETE); |
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} |
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static void |
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redraw(void *data, uint32_t time) |
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{ |
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struct window *window = data; |
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static const GLfloat verts[3][2] = { |
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{ -0.5, -0.5 }, |
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{ 0.5, -0.5 }, |
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{ 0, 0.5 } |
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}; |
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static const GLfloat colors[3][3] = { |
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{ 1, 0, 0 }, |
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{ 0, 1, 0 }, |
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{ 0, 0, 1 } |
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}; |
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GLfloat angle; |
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GLfloat rotation[4][4] = { |
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{ 1, 0, 0, 0 }, |
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{ 0, 1, 0, 0 }, |
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{ 0, 0, 1, 0 }, |
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{ 0, 0, 0, 1 } |
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}; |
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static const int32_t speed_div = 5; |
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static uint32_t start_time = 0; |
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if (start_time == 0) |
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start_time = time; |
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angle = ((time-start_time) / speed_div) % 360 * M_PI / 180.0; |
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rotation[0][0] = cos(angle); |
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rotation[0][2] = sin(angle); |
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rotation[2][0] = -sin(angle); |
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rotation[2][2] = cos(angle); |
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glUniformMatrix4fv(window->gl.rotation_uniform, 1, GL_FALSE, |
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(GLfloat *) rotation); |
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glClearColor(0.0, 0.0, 0.0, 0.5); |
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glClear(GL_COLOR_BUFFER_BIT); |
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glVertexAttribPointer(window->gl.pos, 2, GL_FLOAT, GL_FALSE, 0, verts); |
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glVertexAttribPointer(window->gl.col, 3, GL_FLOAT, GL_FALSE, 0, colors); |
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glEnableVertexAttribArray(window->gl.pos); |
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glEnableVertexAttribArray(window->gl.col); |
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glDrawArrays(GL_TRIANGLES, 0, 3); |
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glDisableVertexAttribArray(window->gl.pos); |
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glDisableVertexAttribArray(window->gl.col); |
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glFlush(); |
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wl_surface_damage(window->drm_surface.surface, 0, 0, |
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window->geometry.width, window->geometry.height); |
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wl_display_frame_callback(window->display->display, redraw, window); |
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} |
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static void |
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drm_handle_device(void *data, struct wl_drm *drm, const char *device) |
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{ |
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struct display *d = data; |
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d->drm.device_name = strdup(device); |
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} |
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static void |
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drm_handle_authenticated(void *data, struct wl_drm *drm) |
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{ |
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struct display *d = data; |
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d->drm.authenticated = true; |
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} |
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static const struct wl_drm_listener drm_listener = { |
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drm_handle_device, |
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drm_handle_authenticated |
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}; |
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static void |
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display_handle_global(struct wl_display *display, uint32_t id, |
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const char *interface, uint32_t version, void *data) |
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{ |
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struct display *d = data; |
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if (strcmp(interface, "compositor") == 0) { |
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d->interface.compositor = wl_compositor_create(display, id); |
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} else if (strcmp(interface, "drm") == 0) { |
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d->interface.drm = wl_drm_create(display, id); |
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wl_drm_add_listener(d->interface.drm, &drm_listener, d); |
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} |
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} |
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static int |
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event_mask_update(uint32_t mask, void *data) |
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{ |
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struct display *d = data; |
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d->mask = mask; |
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return 0; |
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} |
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int |
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main(int argc, char **argv) |
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{ |
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struct display display = { 0 }; |
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struct window window = { 0 }; |
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drm_magic_t magic; |
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int ret; |
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memset(&display, 0, sizeof display); |
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memset(&window, 0, sizeof window); |
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window.display = &display; |
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window.geometry.width = 250; |
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window.geometry.height = 250; |
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display.display = wl_display_connect(NULL); |
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assert(display.display); |
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wl_display_add_global_listener(display.display, |
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display_handle_global, &display); |
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/* process connection events */ |
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wl_display_iterate(display.display, WL_DISPLAY_READABLE); |
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display.drm.fd = open(display.drm.device_name, O_RDWR); |
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assert(display.drm.fd >= 0); |
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ret = drmGetMagic(display.drm.fd, &magic); |
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assert(ret == 0); |
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wl_drm_authenticate(display.interface.drm, magic); |
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wl_display_iterate(display.display, WL_DISPLAY_WRITABLE); |
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while (!display.drm.authenticated) |
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wl_display_iterate(display.display, WL_DISPLAY_READABLE); |
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init_egl(&display); |
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init_gl(&window); |
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create_surface(&window); |
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wl_display_frame_callback(display.display, redraw, &window); |
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wl_display_get_fd(display.display, event_mask_update, &display); |
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while (true) |
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wl_display_iterate(display.display, display.mask); |
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return 0; |
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} |
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