src/bin/test_glview_simple.c

   1 #ifdef HAVE_CONFIG_H
   2 # include "elementary_config.h"
   3 #endif
   4 #include <Elementary.h>
   5 #ifndef ELM_LIB_QUICKLAUNCH
   6
   7 typedef struct _GLData GLData;
   8
   9 // GL related data here..
  10 struct _GLData
  11 {
  12    Evas_GL_API *glapi;
  13    GLuint       program;
  14    GLuint       vtx_shader;
  15    GLuint       fgmt_shader;
  16    GLuint       vbo;
  17    int          initialized : 1;
  18 };
  19
  20
  21 static float red = 1.0;
  22
  23 //--------------------------------//
  24 static GLuint
  25 load_shader( GLData *gld, GLenum type, const char *shader_src )
  26 {
  27    Evas_GL_API *gl = gld->glapi;
  28    GLuint shader;
  29    GLint compiled;
  30
  31    // Create the shader object
  32    shader = gl->glCreateShader(type);
  33    if (shader==0)
  34       return 0;
  35
  36    // Load/Compile shader source
  37    gl->glShaderSource(shader, 1, &shader_src, NULL);
  38    gl->glCompileShader(shader);
  39    gl->glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
  40
  41    if (!compiled)
  42      {
  43         GLint info_len = 0;
  44         gl->glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &info_len);
  45         if (info_len > 1)
  46           {
  47              char* info_log = malloc(sizeof(char) * info_len);
  48
  49              gl->glGetShaderInfoLog(shader, info_len, NULL, info_log);
  50              printf("Error compiling shader:\n%s\n======\n%s\n======\n", info_log, shader_src );
  51              free(info_log);
  52           }
  53         gl->glDeleteShader(shader);
  54         return 0;
  55      }
  56
  57    return shader;
  58 }
  59
  60 // Initialize the shader and program object
  61 static int
  62 init_shaders(GLData *gld)
  63 {
  64    Evas_GL_API *gl = gld->glapi;
  65    GLbyte vShaderStr[] =
  66       "attribute vec4 vPosition;    \n"
  67       "void main()                  \n"
  68       "{                            \n"
  69       "   gl_Position = vPosition;  \n"
  70       "}                            \n";
  71
  72    GLbyte fShaderStr[] =
  73       "#ifdef GL_ES                                 \n"
  74       "precision mediump float;                     \n"
  75       "#endif                                       \n"
  76       "void main()                                  \n"
  77       "{                                            \n"
  78       "  gl_FragColor = vec4 ( 1.0, 0.0, 0.0, 1.0 );\n"
  79       "}                                            \n";
  80
  81    GLint linked;
  82
  83    // Load the vertex/fragment shaders
  84    gld->vtx_shader  = load_shader(gld, GL_VERTEX_SHADER, (const char*)vShaderStr);
  85    gld->fgmt_shader = load_shader(gld, GL_FRAGMENT_SHADER, (const char*)fShaderStr);
  86
  87    // Create the program object
  88    gld->program = gl->glCreateProgram( );
  89    if (gld->program==0)
  90       return 0;
  91
  92    gl->glAttachShader(gld->program, gld->vtx_shader);
  93    gl->glAttachShader(gld->program, gld->fgmt_shader);
  94
  95    gl->glBindAttribLocation(gld->program, 0, "vPosition");
  96    gl->glLinkProgram(gld->program);
  97    gl->glGetProgramiv(gld->program, GL_LINK_STATUS, &linked);
  98
  99    if (!linked)
 100      {
 101         GLint info_len = 0;
 102         gl->glGetProgramiv(gld->program, GL_INFO_LOG_LENGTH, &info_len);
 103         if (info_len > 1)
 104           {
 105              char* info_log = malloc(sizeof(char) * info_len);
 106
 107              gl->glGetProgramInfoLog(gld->program, info_len, NULL, info_log);
 108              printf("Error linking program:\n%s\n", info_log);
 109              free(info_log);
 110           }
 111         gl->glDeleteProgram(gld->program);
 112         return 0;
 113      }
 114    return 1;
 115 }
 116
 117
 118
 119 // Callbacks
 120 static void
 121 _init_gl(Evas_Object *obj)
 122 {
 123    GLData *gld = evas_object_data_get(obj, "gld");
 124    Evas_GL_API *gl = gld->glapi;
 125    GLfloat vVertices[] = {  0.0f,  0.5f, 0.0f,
 126                            -0.5f, -0.5f, 0.0f,
 127                             0.5f, -0.5f, 0.0f };
 128
 129    if (!init_shaders(gld))
 130      {
 131         printf("Error Initializing Shaders\n");
 132         return;
 133      }
 134
 135    gl->glGenBuffers(1, &gld->vbo);
 136    gl->glBindBuffer(GL_ARRAY_BUFFER, gld->vbo);
 137    gl->glBufferData(GL_ARRAY_BUFFER, 3 * 3 * 4, vVertices, GL_STATIC_DRAW);
 138 }
 139
 140 static void
 141 _del_gl(Evas_Object *obj)
 142 {
 143    GLData *gld = evas_object_data_get(obj, "gld");
 144    if (!gld)
 145      {
 146         printf("Unable to get GLData. \n");
 147         return;
 148      }
 149    Evas_GL_API *gl = gld->glapi;
 150
 151    gl->glDeleteShader(gld->vtx_shader);
 152    gl->glDeleteShader(gld->fgmt_shader);
 153    gl->glDeleteProgram(gld->program);
 154    gl->glDeleteBuffers(1, &gld->vbo);
 155
 156    evas_object_data_del((Evas_Object*)obj, "..gld");
 157    free(gld);
 158 }
 159
 160
 161 static void
 162 _resize_gl(Evas_Object *obj)
 163 {
 164    int w, h;
 165    GLData *gld = evas_object_data_get(obj, "gld");
 166    Evas_GL_API *gl = gld->glapi;
 167
 168    elm_glview_size_get(obj, &w, &h);
 169
 170    // GL Viewport stuff. you can avoid doing this if viewport is all the
 171    // same as last frame if you want
 172    gl->glViewport(0, 0, w, h);
 173 }
 174
 175
 176
 177 static void
 178 _draw_gl(Evas_Object *obj)
 179 {
 180    Evas_GL_API *gl = elm_glview_gl_api_get(obj);
 181    GLData *gld = evas_object_data_get(obj, "gld");
 182    if (!gld) return;
 183    int w, h;
 184
 185    elm_glview_size_get(obj, &w, &h);
 186
 187    gl->glViewport(0, 0, w, h);
 188    gl->glClearColor(red,0.8,0.3,1);
 189    gl->glClear(GL_COLOR_BUFFER_BIT);
 190
 191    // Draw a Triangle
 192    gl->glEnable(GL_BLEND);
 193
 194    gl->glUseProgram(gld->program);
 195
 196    gl->glBindBuffer(GL_ARRAY_BUFFER, gld->vbo);
 197    gl->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE,
 198                              0, 0);
 199    gl->glEnableVertexAttribArray(0);
 200
 201    gl->glDrawArrays(GL_TRIANGLES, 0, 3);
 202
 203    // Optional - Flush the GL pipeline
 204    gl->glFinish();
 205
 206    red -= 0.1;
 207    if (red < 0.0) red = 1.0;
 208 }
 209
 210 static Eina_Bool
 211 _anim(void *data)
 212 {
 213    elm_glview_changed_set(data);
 214    return EINA_TRUE;
 215 }
 216
 217 static void
 218 _on_done(void *data, Evas_Object *obj __UNUSED__, void *event_info __UNUSED__)
 219 {
 220    evas_object_del((Evas_Object*)data);
 221 }
 222
 223
 224 static void
 225 _del(void *data __UNUSED__, Evas *evas __UNUSED__, Evas_Object *obj, void *event_info __UNUSED__)
 226 {
 227    Ecore_Animator *ani = evas_object_data_get(obj, "ani");
 228    ecore_animator_del(ani);
 229 }
 230
 231
 232 void
 233 test_glview_simple(void *data __UNUSED__, Evas_Object *obj __UNUSED__, void *event_info __UNUSED__)
 234 {
 235    Evas_Object *win, *bx, *bt, *gl;
 236    Ecore_Animator *ani;
 237    GLData *gld = NULL;
 238
 239    if (!(gld = calloc(1, sizeof(GLData)))) return;
 240
 241    // Set the engine to opengl_x11
 242    elm_config_preferred_engine_set("opengl_x11");
 243    win = elm_win_util_standard_add("glview simple", "GLView Simple");
 244    // Set preferred engine back to default from config
 245    elm_config_preferred_engine_set(NULL);
 246
 247    elm_win_autodel_set(win, EINA_TRUE);
 248
 249    bx = elm_box_add(win);
 250    evas_object_size_hint_weight_set(bx, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
 251    elm_win_resize_object_add(win, bx);
 252    evas_object_show(bx);
 253
 254    gl = elm_glview_add(win);
 255    evas_object_size_hint_align_set(gl, EVAS_HINT_FILL, EVAS_HINT_FILL);
 256    evas_object_size_hint_weight_set(gl, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
 257    elm_glview_mode_set(gl, ELM_GLVIEW_ALPHA | ELM_GLVIEW_DEPTH);
 258    elm_glview_resize_policy_set(gl, ELM_GLVIEW_RESIZE_POLICY_RECREATE);
 259    elm_glview_render_policy_set(gl, ELM_GLVIEW_RENDER_POLICY_ON_DEMAND);
 260    elm_glview_init_func_set(gl, _init_gl);
 261    elm_glview_del_func_set(gl, _del_gl);
 262    elm_glview_resize_func_set(gl, _resize_gl);
 263    elm_glview_render_func_set(gl, _draw_gl);
 264    elm_box_pack_end(bx, gl);
 265    evas_object_show(gl);
 266
 267    elm_object_focus_set(gl, EINA_TRUE);
 268
 269    ani = ecore_animator_add(_anim, gl);
 270    gld->glapi = elm_glview_gl_api_get(gl);
 271    evas_object_data_set(gl, "ani", ani);
 272    evas_object_data_set(gl, "gld", gld);
 273    evas_object_event_callback_add(gl, EVAS_CALLBACK_DEL, _del, gl);
 274
 275    bt = elm_button_add(win);
 276    elm_object_text_set(bt, "OK");
 277    evas_object_size_hint_align_set(bt, EVAS_HINT_FILL, EVAS_HINT_FILL);
 278    evas_object_size_hint_weight_set(bt, EVAS_HINT_EXPAND, 0.0);
 279    elm_box_pack_end(bx, bt);
 280    evas_object_show(bt);
 281    evas_object_smart_callback_add(bt, "clicked", _on_done, win);
 282
 283    evas_object_resize(win, 320, 480);
 284    evas_object_show(win);
 285 }
 286 #endif