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ffa573f8 D |
1 | #include "bcm_host.h" |
2 | #include "GLES/gl.h" | |
3 | #include "EGL/egl.h" | |
4 | #include "EGL/eglext.h" | |
5 | #include "GLES2/gl2.h" | |
6 | #include <assert.h> | |
7 | #include <stdio.h> | |
8 | #include <stdlib.h> | |
9 | #include <memory.h> | |
10 | ||
11 | static uint32_t frame_width = 0; | |
12 | static uint32_t frame_height = 0; | |
13 | ||
14 | ||
15 | #define SHOW_ERROR gles_show_error(); | |
16 | ||
17 | static void SetOrtho(GLfloat m[4][4], GLfloat left, GLfloat right, GLfloat bottom, GLfloat top, GLfloat near, GLfloat far, GLfloat scale_x, GLfloat scale_y); | |
18 | ||
19 | static const char* vertex_shader = | |
20 | "uniform mat4 u_vp_matrix; \n" | |
21 | "attribute vec4 a_position; \n" | |
22 | "attribute vec2 a_texcoord; \n" | |
23 | "varying mediump vec2 v_texcoord; \n" | |
24 | "void main() \n" | |
25 | "{ \n" | |
26 | " v_texcoord = a_texcoord; \n" | |
27 | " gl_Position = u_vp_matrix * a_position; \n" | |
28 | "} \n"; | |
29 | ||
30 | static const char* fragment_shader = | |
31 | "varying mediump vec2 v_texcoord; \n" | |
32 | "uniform sampler2D u_texture; \n" | |
33 | "void main() \n" | |
34 | "{ \n" | |
35 | " gl_FragColor = texture2D(u_texture, v_texcoord); \n" | |
36 | "} \n"; | |
37 | ||
38 | static const GLfloat vertices[] = | |
39 | { | |
40 | -0.5f, -0.5f, 0.0f, | |
41 | +0.5f, -0.5f, 0.0f, | |
42 | +0.5f, +0.5f, 0.0f, | |
43 | -0.5f, +0.5f, 0.0f, | |
44 | }; | |
45 | ||
46 | #define TEX_WIDTH 1024 | |
47 | #define TEX_HEIGHT 512 | |
48 | ||
49 | static const GLfloat uvs[8]; | |
50 | ||
51 | static const GLushort indices[] = | |
52 | { | |
53 | 0, 1, 2, | |
54 | 0, 2, 3, | |
55 | }; | |
56 | ||
57 | static const int kVertexCount = 4; | |
58 | static const int kIndexCount = 6; | |
59 | ||
60 | ||
61 | void Create_uvs(GLfloat * matrix, GLfloat max_u, GLfloat max_v) { | |
62 | memset(matrix,0,sizeof(GLfloat)*8); | |
63 | matrix[3]=max_v; | |
64 | matrix[4]=max_u; | |
65 | matrix[5]=max_v; | |
66 | matrix[6]=max_u; | |
67 | ||
68 | } | |
69 | ||
70 | void gles_show_error() | |
71 | { | |
72 | GLenum error = GL_NO_ERROR; | |
73 | error = glGetError(); | |
74 | if (GL_NO_ERROR != error) | |
75 | printf("GL Error %x encountered!\n", error); | |
76 | } | |
77 | ||
78 | static GLuint CreateShader(GLenum type, const char *shader_src) | |
79 | { | |
80 | GLuint shader = glCreateShader(type); | |
81 | if(!shader) | |
82 | return 0; | |
83 | ||
84 | // Load and compile the shader source | |
85 | glShaderSource(shader, 1, &shader_src, NULL); | |
86 | glCompileShader(shader); | |
87 | ||
88 | // Check the compile status | |
89 | GLint compiled = 0; | |
90 | glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled); | |
91 | if(!compiled) | |
92 | { | |
93 | GLint info_len = 0; | |
94 | glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &info_len); | |
95 | if(info_len > 1) | |
96 | { | |
97 | char* info_log = (char *)malloc(sizeof(char) * info_len); | |
98 | glGetShaderInfoLog(shader, info_len, NULL, info_log); | |
99 | // TODO(dspringer): We could really use a logging API. | |
100 | printf("Error compiling shader:\n%s\n", info_log); | |
101 | free(info_log); | |
102 | } | |
103 | glDeleteShader(shader); | |
104 | return 0; | |
105 | } | |
106 | return shader; | |
107 | } | |
108 | ||
109 | static GLuint CreateProgram(const char *vertex_shader_src, const char *fragment_shader_src) | |
110 | { | |
111 | GLuint vertex_shader = CreateShader(GL_VERTEX_SHADER, vertex_shader_src); | |
112 | if(!vertex_shader) | |
113 | return 0; | |
114 | GLuint fragment_shader = CreateShader(GL_FRAGMENT_SHADER, fragment_shader_src); | |
115 | if(!fragment_shader) | |
116 | { | |
117 | glDeleteShader(vertex_shader); | |
118 | return 0; | |
119 | } | |
120 | ||
121 | GLuint program_object = glCreateProgram(); | |
122 | if(!program_object) | |
123 | return 0; | |
124 | glAttachShader(program_object, vertex_shader); | |
125 | glAttachShader(program_object, fragment_shader); | |
126 | ||
127 | // Link the program | |
128 | glLinkProgram(program_object); | |
129 | ||
130 | // Check the link status | |
131 | GLint linked = 0; | |
132 | glGetProgramiv(program_object, GL_LINK_STATUS, &linked); | |
133 | if(!linked) | |
134 | { | |
135 | GLint info_len = 0; | |
136 | glGetProgramiv(program_object, GL_INFO_LOG_LENGTH, &info_len); | |
137 | if(info_len > 1) | |
138 | { | |
139 | char* info_log = (char *)malloc(info_len); | |
140 | glGetProgramInfoLog(program_object, info_len, NULL, info_log); | |
141 | // TODO(dspringer): We could really use a logging API. | |
142 | printf("Error linking program:\n%s\n", info_log); | |
143 | free(info_log); | |
144 | } | |
145 | glDeleteProgram(program_object); | |
146 | return 0; | |
147 | } | |
148 | // Delete these here because they are attached to the program object. | |
149 | glDeleteShader(vertex_shader); | |
150 | glDeleteShader(fragment_shader); | |
151 | return program_object; | |
152 | } | |
153 | ||
154 | typedef struct ShaderInfo { | |
155 | GLuint program; | |
156 | GLint a_position; | |
157 | GLint a_texcoord; | |
158 | GLint u_vp_matrix; | |
159 | GLint u_texture; | |
160 | } ShaderInfo; | |
161 | ||
162 | static ShaderInfo shader; | |
163 | static ShaderInfo shader_filtering; | |
164 | static GLuint buffers[3]; | |
165 | static GLuint textures[2]; | |
166 | ||
167 | ||
168 | static void gles2_create() | |
169 | { | |
170 | memset(&shader, 0, sizeof(ShaderInfo)); | |
171 | shader.program = CreateProgram(vertex_shader, fragment_shader); | |
172 | if(shader.program) | |
173 | { | |
174 | shader.a_position = glGetAttribLocation(shader.program, "a_position"); | |
175 | shader.a_texcoord = glGetAttribLocation(shader.program, "a_texcoord"); | |
176 | shader.u_vp_matrix = glGetUniformLocation(shader.program, "u_vp_matrix"); | |
177 | shader.u_texture = glGetUniformLocation(shader.program, "u_texture"); | |
178 | } | |
179 | glGenTextures(1, textures); | |
180 | glBindTexture(GL_TEXTURE_2D, textures[0]); | |
181 | glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, TEX_WIDTH, TEX_HEIGHT, 0, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, NULL); | |
182 | ||
183 | Create_uvs(uvs, (float)frame_width/TEX_WIDTH, (float)frame_height/TEX_HEIGHT); | |
184 | ||
185 | glGenBuffers(3, buffers); | |
186 | glBindBuffer(GL_ARRAY_BUFFER, buffers[0]); | |
187 | glBufferData(GL_ARRAY_BUFFER, kVertexCount * sizeof(GLfloat) * 3, vertices, GL_STATIC_DRAW); | |
188 | glBindBuffer(GL_ARRAY_BUFFER, buffers[1]); | |
189 | glBufferData(GL_ARRAY_BUFFER, kVertexCount * sizeof(GLfloat) * 2, uvs, GL_STATIC_DRAW); | |
190 | glBindBuffer(GL_ARRAY_BUFFER, 0); | |
191 | glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffers[2]); | |
192 | glBufferData(GL_ELEMENT_ARRAY_BUFFER, kIndexCount * sizeof(GL_UNSIGNED_SHORT), indices, GL_STATIC_DRAW); | |
193 | glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0); | |
194 | ||
195 | glClearColor(0.0f, 0.0f, 0.0f, 1.0f); | |
196 | glDisable(GL_DEPTH_TEST); | |
197 | glDisable(GL_BLEND); | |
198 | glDisable(GL_DITHER); | |
199 | } | |
200 | ||
201 | static uint32_t screen_width = 0; | |
202 | static uint32_t screen_height = 0; | |
203 | ||
204 | static EGLDisplay display = NULL; | |
205 | static EGLSurface surface = NULL; | |
206 | static EGLContext context = NULL; | |
207 | static EGL_DISPMANX_WINDOW_T nativewindow; | |
208 | ||
209 | static GLfloat proj[4][4]; | |
210 | static GLint filter_min; | |
211 | static GLint filter_mag; | |
212 | ||
213 | void video_init(uint32_t _width, uint32_t _height, uint32_t filter) | |
214 | { | |
215 | if ((_width==0)||(_height==0)) | |
216 | return; | |
217 | ||
218 | frame_width = _width; | |
219 | frame_height = _height; | |
220 | ||
221 | bcm_host_init(); | |
222 | ||
223 | // get an EGL display connection | |
224 | display = eglGetDisplay(EGL_DEFAULT_DISPLAY); | |
225 | assert(display != EGL_NO_DISPLAY); | |
226 | ||
227 | // initialize the EGL display connection | |
228 | EGLBoolean result = eglInitialize(display, NULL, NULL); | |
229 | assert(EGL_FALSE != result); | |
230 | ||
231 | // get an appropriate EGL frame buffer configuration | |
232 | EGLint num_config; | |
233 | EGLConfig config; | |
234 | static const EGLint attribute_list[] = | |
235 | { | |
236 | EGL_RED_SIZE, 8, | |
237 | EGL_GREEN_SIZE, 8, | |
238 | EGL_BLUE_SIZE, 8, | |
239 | EGL_ALPHA_SIZE, 8, | |
240 | EGL_SURFACE_TYPE, EGL_WINDOW_BIT, | |
241 | EGL_NONE | |
242 | }; | |
243 | result = eglChooseConfig(display, attribute_list, &config, 1, &num_config); | |
244 | assert(EGL_FALSE != result); | |
245 | ||
246 | result = eglBindAPI(EGL_OPENGL_ES_API); | |
247 | assert(EGL_FALSE != result); | |
248 | ||
249 | // create an EGL rendering context | |
250 | static const EGLint context_attributes[] = | |
251 | { | |
252 | EGL_CONTEXT_CLIENT_VERSION, 2, | |
253 | EGL_NONE | |
254 | }; | |
255 | context = eglCreateContext(display, config, EGL_NO_CONTEXT, context_attributes); | |
256 | assert(context != EGL_NO_CONTEXT); | |
257 | ||
258 | // create an EGL window surface | |
259 | int32_t success = graphics_get_display_size(0, &screen_width, &screen_height); | |
260 | assert(success >= 0); | |
261 | ||
262 | VC_RECT_T dst_rect; | |
263 | dst_rect.x = 0; | |
264 | dst_rect.y = 0; | |
265 | dst_rect.width = screen_width; | |
266 | dst_rect.height = screen_height; | |
267 | ||
268 | VC_RECT_T src_rect; | |
269 | src_rect.x = 0; | |
270 | src_rect.y = 0; | |
271 | src_rect.width = screen_width << 16; | |
272 | src_rect.height = screen_height << 16; | |
273 | ||
274 | DISPMANX_DISPLAY_HANDLE_T dispman_display = vc_dispmanx_display_open(0); | |
275 | DISPMANX_UPDATE_HANDLE_T dispman_update = vc_dispmanx_update_start(0); | |
276 | DISPMANX_ELEMENT_HANDLE_T dispman_element = vc_dispmanx_element_add(dispman_update, dispman_display, | |
277 | 0, &dst_rect, 0, &src_rect, DISPMANX_PROTECTION_NONE, NULL, NULL, DISPMANX_NO_ROTATE); | |
278 | ||
279 | nativewindow.element = dispman_element; | |
280 | nativewindow.width = screen_width; | |
281 | nativewindow.height = screen_height; | |
282 | vc_dispmanx_update_submit_sync(dispman_update); | |
283 | ||
284 | surface = eglCreateWindowSurface(display, config, &nativewindow, NULL); | |
285 | assert(surface != EGL_NO_SURFACE); | |
286 | ||
287 | // connect the context to the surface | |
288 | result = eglMakeCurrent(display, surface, surface, context); | |
289 | assert(EGL_FALSE != result); | |
290 | ||
291 | gles2_create(); | |
292 | ||
293 | int r=(screen_height*10/frame_height); | |
294 | int h = (frame_height*r)/10; | |
295 | int w = (frame_width*r)/10; | |
296 | ||
297 | glViewport((screen_width-w)/2, (screen_height-h)/2, w, h); | |
298 | SetOrtho(proj, -0.5f, +0.5f, +0.5f, -0.5f, -1.0f, 1.0f, 1.0f ,1.0f ); | |
299 | if (filter==0) { | |
300 | filter_min = GL_NEAREST; | |
301 | filter_mag = GL_NEAREST; | |
302 | } else if (filter==1) { | |
303 | filter_min = GL_LINEAR_MIPMAP_LINEAR; | |
304 | filter_mag = GL_LINEAR; | |
305 | } else if (filter==2) { | |
306 | filter_min = GL_LINEAR_MIPMAP_NEAREST; | |
307 | filter_mag = GL_LINEAR; | |
308 | ||
309 | } | |
310 | ||
311 | } | |
312 | ||
313 | static void gles2_destroy() | |
314 | { | |
315 | if(!shader.program) | |
316 | return; | |
317 | glDeleteBuffers(3, buffers); SHOW_ERROR | |
318 | glDeleteProgram(shader.program); SHOW_ERROR | |
319 | } | |
320 | ||
321 | static void SetOrtho(GLfloat m[4][4], GLfloat left, GLfloat right, GLfloat bottom, GLfloat top, GLfloat near, GLfloat far, GLfloat scale_x, GLfloat scale_y) | |
322 | { | |
323 | memset(m, 0, 4*4*sizeof(GLfloat)); | |
324 | m[0][0] = 2.0f/(right - left)*scale_x; | |
325 | m[1][1] = 2.0f/(top - bottom)*scale_y; | |
326 | m[2][2] = -2.0f/(far - near); | |
327 | m[3][0] = -(right + left)/(right - left); | |
328 | m[3][1] = -(top + bottom)/(top - bottom); | |
329 | m[3][2] = -(far + near)/(far - near); | |
330 | m[3][3] = 1; | |
331 | } | |
332 | #define RGB15(r, g, b) (((r) << (5+6)) | ((g) << 6) | (b)) | |
333 | ||
334 | static void gles2_Draw( uint16_t *pixels) | |
335 | { | |
336 | if(!shader.program) | |
337 | return; | |
338 | ||
339 | glClear(GL_COLOR_BUFFER_BIT); | |
340 | ||
341 | glUseProgram(shader.program); | |
342 | ||
343 | glBindTexture(GL_TEXTURE_2D, textures[0]); | |
344 | glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, frame_width, frame_height, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, pixels); | |
345 | glActiveTexture(GL_TEXTURE0); | |
346 | glUniform1i(shader.u_texture, 0); | |
347 | ||
348 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter_min); | |
349 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter_mag); | |
350 | glGenerateMipmap(GL_TEXTURE_2D); | |
351 | ||
352 | glBindBuffer(GL_ARRAY_BUFFER, buffers[0]); | |
353 | glVertexAttribPointer(shader.a_position, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(GLfloat), NULL); | |
354 | glEnableVertexAttribArray(shader.a_position); | |
355 | ||
356 | glBindBuffer(GL_ARRAY_BUFFER, buffers[1]); | |
357 | glVertexAttribPointer(shader.a_texcoord, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(GLfloat), NULL); | |
358 | glEnableVertexAttribArray(shader.a_texcoord); | |
359 | ||
360 | glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffers[2]); | |
361 | glUniformMatrix4fv(shader.u_vp_matrix, 1, GL_FALSE, (const GLfloat * )&proj); | |
362 | glDrawElements(GL_TRIANGLES, kIndexCount, GL_UNSIGNED_SHORT, 0); | |
363 | ||
364 | glBindBuffer(GL_ARRAY_BUFFER, 0); | |
365 | glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0); | |
366 | //glFlush(); | |
367 | } | |
368 | ||
369 | void video_close() | |
370 | { | |
371 | gles2_destroy(); | |
372 | // Release OpenGL resources | |
373 | eglMakeCurrent( display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT ); | |
374 | eglDestroySurface( display, surface ); | |
375 | eglDestroyContext( display, context ); | |
376 | eglTerminate( display ); | |
377 | } | |
378 | ||
379 | void video_draw(uint16_t *pixels) | |
380 | { | |
381 | gles2_Draw (pixels); | |
382 | eglSwapBuffers(display, surface); | |
383 | } |