#include <Elementary.h>
#include <Evas_GL.h>
#include <stdio.h>
typedef struct _GLData GLData;
struct _GLData
{
Evas_GL_API *glapi;
GLuint program;
GLuint vtx_shader;
GLuint fgmt_shader;
GLuint vbo;
int initialized : 1;
};
static float red = 1.0;
static GLuint
load_shader( GLData *gld, GLenum type, const char *shader_src )
{
Evas_GL_API *gl = gld->glapi;
GLuint shader;
GLint compiled;
shader = gl->glCreateShader(type);
if (shader==0)
return 0;
gl->glShaderSource(shader, 1, &shader_src, NULL);
gl->glCompileShader(shader);
gl->glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
if (!compiled)
{
GLint info_len = 0;
gl->glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &info_len);
if (info_len > 1)
{
char* info_log = malloc(sizeof(char) * info_len);
gl->glGetShaderInfoLog(shader, info_len, NULL, info_log);
printf("Error compiling shader:\n%s\n======\n%s\n======\n", info_log, shader_src );
free(info_log);
}
gl->glDeleteShader(shader);
return 0;
}
return shader;
}
static int
init_shaders(GLData *gld)
{
Evas_GL_API *gl = gld->glapi;
GLbyte vShaderStr[] =
"attribute vec4 vPosition; \n"
"void main() \n"
"{ \n"
" gl_Position = vPosition; \n"
"} \n";
GLbyte fShaderStr[] =
"#ifdef GL_ES \n"
"precision mediump float; \n"
"#endif \n"
"void main() \n"
"{ \n"
" gl_FragColor = vec4 ( 1.0, 0.0, 0.0, 1.0 );\n"
"} \n";
GLint linked;
gld->vtx_shader = load_shader(gld, GL_VERTEX_SHADER, (const char*)vShaderStr);
gld->fgmt_shader = load_shader(gld, GL_FRAGMENT_SHADER, (const char*)fShaderStr);
gld->program = gl->glCreateProgram( );
if (gld->program==0)
return 0;
gl->glAttachShader(gld->program, gld->vtx_shader);
gl->glAttachShader(gld->program, gld->fgmt_shader);
gl->glBindAttribLocation(gld->program, 0, "vPosition");
gl->glLinkProgram(gld->program);
gl->glGetProgramiv(gld->program, GL_LINK_STATUS, &linked);
if (!linked)
{
GLint info_len = 0;
gl->glGetProgramiv(gld->program, GL_INFO_LOG_LENGTH, &info_len);
if (info_len > 1)
{
char* info_log = malloc(sizeof(char) * info_len);
gl->glGetProgramInfoLog(gld->program, info_len, NULL, info_log);
printf("Error linking program:\n%s\n", info_log);
free(info_log);
}
gl->glDeleteProgram(gld->program);
return 0;
}
return 1;
}
static void
_init_gl(Evas_Object *obj)
{
GLData *gld = evas_object_data_get(obj, "gld");
Evas_GL_API *gl = gld->glapi;
GLfloat vVertices[] = {
0.0f, 0.5f, 0.0f,
-0.5f, -0.5f, 0.0f,
0.5f, -0.5f, 0.0f };
if (!init_shaders(gld))
{
printf("Error Initializing Shaders\n");
return;
}
gl->glGenBuffers(1, &gld->vbo);
gl->glBindBuffer(GL_ARRAY_BUFFER, gld->vbo);
gl->glBufferData(GL_ARRAY_BUFFER, 3 * 3 * 4, vVertices, GL_STATIC_DRAW);
}
static void
_del_gl(Evas_Object *obj)
{
GLData *gld = evas_object_data_get(obj, "gld");
if (!gld)
{
printf("Unable to get GLData. \n");
return;
}
Evas_GL_API *gl = gld->glapi;
gl->glDeleteShader(gld->vtx_shader);
gl->glDeleteShader(gld->fgmt_shader);
gl->glDeleteProgram(gld->program);
gl->glDeleteBuffers(1, &gld->vbo);
evas_object_data_del((Evas_Object*)obj, "..gld");
free(gld);
}
static void
_resize_gl(Evas_Object *obj)
{
int w, h;
GLData *gld = evas_object_data_get(obj, "gld");
Evas_GL_API *gl = gld->glapi;
gl->glViewport(0, 0, w, h);
}
static void
_draw_gl(Evas_Object *obj)
{
GLData *gld = evas_object_data_get(obj, "gld");
if (!gld) return;
int w, h;
gl->glViewport(0, 0, w, h);
gl->glClearColor(red,0.8,0.3,1);
gl->glClear(GL_COLOR_BUFFER_BIT);
gl->glEnable(GL_BLEND);
gl->glUseProgram(gld->program);
gl->glBindBuffer(GL_ARRAY_BUFFER, gld->vbo);
gl->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE,
0, 0);
gl->glEnableVertexAttribArray(0);
gl->glDrawArrays(GL_TRIANGLES, 0, 3);
gl->glFinish();
red -= 0.1;
if (red < 0.0) red = 1.0;
}
static Eina_Bool
_anim(void *data)
{
return EINA_TRUE;
}
static void
_on_done(void *data, Evas_Object *obj, void *event_info)
{
evas_object_del((Evas_Object*)data);
}
static void
_del(void *data, Evas *evas, Evas_Object *obj, void *event_info)
{
Ecore_Animator *ani = evas_object_data_get(obj, "ani");
ecore_animator_del(ani);
}
EAPI_MAIN int
elm_main(int argc, char **argv)
{
Evas_Object *win, *bx, *bt, *gl;
Ecore_Animator *ani;
GLData *gld = NULL;
if (!(gld = calloc(1, sizeof(GLData)))) return 1;
evas_object_size_hint_weight_set(bx, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
evas_object_show(bx);
evas_object_size_hint_align_set(gl, EVAS_HINT_FILL, EVAS_HINT_FILL);
evas_object_size_hint_weight_set(gl, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
elm_box_pack_end(bx, gl);
evas_object_show(gl);
ani = ecore_animator_add(_anim, gl);
evas_object_data_set(gl, "ani", ani);
evas_object_data_set(gl, "gld", gld);
evas_object_event_callback_add(gl, EVAS_CALLBACK_DEL, _del, gl);
elm_object_text_set(bt, "OK");
evas_object_size_hint_align_set(bt, EVAS_HINT_FILL, EVAS_HINT_FILL);
evas_object_size_hint_weight_set(bt, EVAS_HINT_EXPAND, 0.0);
elm_box_pack_end(bx, bt);
evas_object_show(bt);
evas_object_smart_callback_add(bt, "clicked", _on_done, win);
evas_object_resize(win, 320, 480);
evas_object_show(win);
return 0;
}