b9801854 |
1 | #include <stdio.h> |
2 | #include <stdlib.h> |
3 | |
4 | #include <EGL/egl.h> |
5 | #include <GLES/gl.h> |
6 | #include "gl.h" |
7 | |
8 | static EGLDisplay edpy; |
9 | static EGLSurface esfc; |
10 | static EGLContext ectxt; |
11 | |
12 | static int gl_have_error(const char *name) |
13 | { |
14 | GLenum e = glGetError(); |
15 | if (e != GL_NO_ERROR) { |
16 | fprintf(stderr, "GL error: %s %x\n", name, e); |
17 | return 1; |
18 | } |
19 | return 0; |
20 | } |
21 | |
22 | static int gles_have_error(const char *name) |
23 | { |
24 | EGLint e = eglGetError(); |
25 | if (e != EGL_SUCCESS) { |
26 | fprintf(stderr, "%s %x\n", name, e); |
27 | return 1; |
28 | } |
29 | return 0; |
30 | } |
31 | |
32 | int gl_init(void *display, void *window) |
33 | { |
34 | EGLConfig ecfg = NULL; |
35 | GLuint texture_name = 0; |
36 | void *tmp_texture_mem = NULL; |
37 | EGLint num_config; |
38 | int retval = -1; |
39 | int ret; |
40 | EGLint attr[] = |
41 | { |
42 | EGL_NONE |
43 | }; |
44 | |
45 | tmp_texture_mem = calloc(1, 1024 * 512 * 2); |
46 | if (tmp_texture_mem == NULL) { |
47 | fprintf(stderr, "OOM\n"); |
48 | goto out; |
49 | } |
50 | |
51 | edpy = eglGetDisplay((EGLNativeDisplayType)display); |
52 | if (edpy == EGL_NO_DISPLAY) { |
53 | fprintf(stderr, "Failed to get EGL display\n"); |
54 | goto out; |
55 | } |
56 | |
57 | if (!eglInitialize(edpy, NULL, NULL)) { |
58 | fprintf(stderr, "Failed to initialize EGL\n"); |
59 | goto out; |
60 | } |
61 | |
62 | if (!eglChooseConfig(edpy, attr, &ecfg, 1, &num_config)) { |
63 | fprintf(stderr, "Failed to choose config (%x)\n", eglGetError()); |
64 | goto out; |
65 | } |
66 | |
67 | if (ecfg == NULL || num_config == 0) { |
68 | fprintf(stderr, "No EGL configs available\n"); |
69 | goto out; |
70 | } |
71 | |
72 | esfc = eglCreateWindowSurface(edpy, ecfg, |
73 | (EGLNativeWindowType)window, NULL); |
74 | if (esfc == EGL_NO_SURFACE) { |
75 | fprintf(stderr, "Unable to create EGL surface (%x)\n", |
76 | eglGetError()); |
77 | goto out; |
78 | } |
79 | |
80 | ectxt = eglCreateContext(edpy, ecfg, EGL_NO_CONTEXT, NULL); |
81 | if (ectxt == EGL_NO_CONTEXT) { |
82 | fprintf(stderr, "Unable to create EGL context (%x)\n", |
83 | eglGetError()); |
84 | goto out; |
85 | } |
86 | |
87 | eglMakeCurrent(edpy, esfc, esfc, ectxt); |
88 | |
89 | glEnable(GL_TEXTURE_2D); |
90 | |
91 | glGenTextures(1, &texture_name); |
92 | |
93 | glBindTexture(GL_TEXTURE_2D, texture_name); |
94 | |
95 | glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 1024, 512, 0, GL_RGB, |
96 | GL_UNSIGNED_SHORT_5_6_5, tmp_texture_mem); |
97 | if (gl_have_error("glTexImage2D")) |
98 | goto out; |
99 | |
100 | // no mipmaps |
101 | glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
102 | glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
103 | |
104 | //glViewport(0, 0, 512, 512); |
105 | glLoadIdentity(); |
106 | glFrontFace(GL_CW); |
107 | glEnable(GL_CULL_FACE); |
108 | |
109 | glEnableClientState(GL_TEXTURE_COORD_ARRAY); |
110 | glEnableClientState(GL_VERTEX_ARRAY); |
111 | |
112 | if (gl_have_error("init")) |
113 | goto out; |
114 | |
115 | retval = 0; |
116 | out: |
117 | free(tmp_texture_mem); |
118 | return retval; |
119 | } |
120 | |
121 | static float vertices[] = { |
122 | -1.0f, 1.0f, 0.0f, // 0 0 1 |
123 | 1.0f, 1.0f, 0.0f, // 1 ^ |
124 | -1.0f, -1.0f, 0.0f, // 2 | 2 3 |
125 | 1.0f, -1.0f, 0.0f, // 3 +--> |
126 | }; |
127 | |
128 | static float texture[] = { |
129 | 0.0f, 0.0f, // we flip this: |
130 | 1.0f, 0.0f, // v^ |
131 | 0.0f, 1.0f, // | u |
132 | 1.0f, 1.0f, // +--> |
133 | }; |
134 | |
135 | int gl_flip(const void *fb, int w, int h) |
136 | { |
137 | static int old_w, old_h; |
138 | |
139 | if (w != old_w || h != old_h) { |
140 | float f_w = (float)w / 1024.0f; |
141 | float f_h = (float)h / 512.0f; |
142 | texture[1*2 + 0] = f_w; |
143 | texture[2*2 + 1] = f_h; |
144 | texture[3*2 + 0] = f_w; |
145 | texture[3*2 + 1] = f_h; |
146 | old_w = w; |
147 | old_h = h; |
148 | } |
149 | |
150 | glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, w, h, |
151 | GL_RGB, GL_UNSIGNED_SHORT_5_6_5, fb); |
152 | if (gl_have_error("glTexSubImage2D")) |
153 | return -1; |
154 | |
155 | glVertexPointer(3, GL_FLOAT, 0, vertices); |
156 | glTexCoordPointer(2, GL_FLOAT, 0, texture); |
157 | glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); |
158 | |
159 | if (gl_have_error("glDrawArrays")) |
160 | return -1; |
161 | |
162 | eglSwapBuffers(edpy, esfc); |
163 | if (gles_have_error("eglSwapBuffers")) |
164 | return -1; |
165 | |
166 | return 0; |
167 | } |
168 | |
169 | void gl_finish(void) |
170 | { |
171 | eglMakeCurrent(edpy, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT); |
172 | eglDestroyContext(edpy, ectxt); |
173 | ectxt = EGL_NO_CONTEXT; |
174 | eglDestroySurface(edpy, esfc); |
175 | esfc = EGL_NO_SURFACE; |
176 | eglTerminate(edpy); |
177 | edpy = EGL_NO_DISPLAY; |
178 | } |