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gl test
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Authored by zmike on May 31 2018, 4:13 AM.
/**
* Example of working with OpenGL APIs in Evas.
*
* Evas_GL.h should be added for Evas GL APIs access.
*
* @verbatim
* gcc -o evas-gl evas-gl.c `pkg-config --libs --cflags evas ecore ecore-evas` -lm
* @endverbatim
*/
#include <Ecore.h>
#include <Ecore_Evas.h>
#include <Evas_GL.h>
#include <math.h>
#define WIDTH 500
#define HEIGHT 500
//GL related data here...
typedef struct _GLData
{
Evas_Object *win;
Evas_GL *evasgl;
Evas_GL_API *glapi;
Evas_GL_Context *ctx;
Evas_GL_Surface *sfc;
Evas_Object *img;
unsigned int program;
unsigned int vtx_shader;
unsigned int fgmt_shader;
unsigned int vbo;
float view[16];
float xangle;
float yangle;
Eina_Bool mouse_down : 1;
Eina_Bool initialized : 1;
} GLData;
static GLData gldata;
//Define the cube's vertices
//Each vertex consist of x, y, z, r, g, b
const float cube_vertices[] =
{
//front surface is blue
0.5, 0.5, 0.5, 0.0, 0.0, 1.0,
-0.5, -0.5, 0.5, 0.0, 0.0, 1.0,
0.5, -0.5, 0.5, 0.0, 0.0, 1.0,
0.5, 0.5, 0.5, 0.0, 0.0, 1.0,
-0.5, 0.5, 0.5, 0.0, 0.0, 1.0,
-0.5, -0.5, 0.5, 0.0, 0.0, 1.0,
//left surface is green
-0.5, 0.5, 0.5, 0.0, 1.0, 0.0,
-0.5, -0.5, -0.5, 0.0, 1.0, 0.0,
-0.5, -0.5, 0.5, 0.0, 1.0, 0.0,
-0.5, 0.5, 0.5, 0.0, 1.0, 0.0,
-0.5, 0.5, -0.5, 0.0, 1.0, 0.0,
-0.5, -0.5, -0.5, 0.0, 1.0, 0.0,
//top surface is red
-0.5, 0.5, 0.5, 1.0, 0.0, 0.0,
0.5, 0.5, -0.5, 1.0, 0.0, 0.0,
-0.5, 0.5, -0.5, 1.0, 0.0, 0.0,
-0.5, 0.5, 0.5, 1.0, 0.0, 0.0,
0.5, 0.5, 0.5, 1.0, 0.0, 0.0,
0.5, 0.5, -0.5, 1.0, 0.0, 0.0,
//right surface is yellow
0.5, 0.5, -0.5, 1.0, 1.0, 0.0,
0.5, -0.5, 0.5, 1.0, 1.0, 0.0,
0.5, -0.5, -0.5, 1.0, 1.0, 0.0,
0.5, 0.5, -0.5, 1.0, 1.0, 0.0,
0.5, 0.5, 0.5, 1.0, 1.0, 0.0,
0.5, -0.5, 0.5, 1.0, 1.0, 0.0,
//back surface is cyan
-0.5, 0.5, -0.5, 0.0, 1.0, 1.0,
0.5, -0.5, -0.5, 0.0, 1.0, 1.0,
-0.5, -0.5, -0.5, 0.0, 1.0, 1.0,
-0.5, 0.5, -0.5, 0.0, 1.0, 1.0,
0.5, 0.5, -0.5, 0.0, 1.0, 1.0,
0.5, -0.5, -0.5, 0.0, 1.0, 1.0,
//bottom surface is magenta
-0.5, -0.5, -0.5, 1.0, 0.0, 1.0,
0.5, -0.5, 0.5, 1.0, 0.0, 1.0,
-0.5, -0.5, 0.5, 1.0, 0.0, 1.0,
-0.5, -0.5, -0.5, 1.0, 0.0, 1.0,
0.5, -0.5, -0.5, 1.0, 0.0, 1.0,
0.5, -0.5, 0.5, 1.0, 0.0, 1.0
};
//Vertext Shader Source
static const char vertex_shader[] =
"attribute vec4 vPosition;\n"
"attribute vec3 inColor;\n"
"uniform mat4 mvpMatrix;"
"varying vec3 outColor;\n"
"void main()\n"
"{\n"
" outColor = inColor;\n"
" gl_Position = mvpMatrix * vPosition;\n"
"}\n";
//Fragment Shader Source
static const char fragment_shader[] =
"#ifdef GL_ES\n"
"precision mediump float;\n"
"#endif\n"
"varying vec3 outColor;\n"
"void main()\n"
"{\n"
" gl_FragColor = vec4 ( outColor, 1.0 );\n"
"}\n";
//Rotation Operation related functions here...
static void
init_matrix(float matrix[16])
{
matrix[0] = 1.0f;
matrix[1] = 0.0f;
matrix[2] = 0.0f;
matrix[3] = 0.0f;
matrix[4] = 0.0f;
matrix[5] = 1.0f;
matrix[6] = 0.0f;
matrix[7] = 0.0f;
matrix[8] = 0.0f;
matrix[9] = 0.0f;
matrix[10] = 1.0f;
matrix[11] = 0.0f;
matrix[12] = 0.0f;
matrix[13] = 0.0f;
matrix[14] = 0.0f;
matrix[15] = 1.0f;
}
static void
multiply_matrix(float matrix[16], const float matrix0[16],
const float matrix1[16])
{
int i;
int row;
int column;
float temp[16];
for (column = 0; column < 4; column++)
{
for (row = 0; row < 4; row++)
{
temp[(column * 4) + row] = 0.0f;
for (i = 0; i < 4; i++)
temp[(column * 4) + row] += matrix0[(i * 4) + row] * matrix1[(column * 4) + i];
}
}
for (i = 0; i < 16; i++)
matrix[i] = temp[i];
}
static void
rotate_xyz(float matrix[16], const float anglex, const float angley,
const float anglez)
{
const float pi = 3.141592f;
float temp[16];
float rx = 2.0f * pi * anglex / 360.0f;
float ry = 2.0f * pi * angley / 360.0f;
float rz = 2.0f * pi * anglez / 360.0f;
float sy = sinf(ry);
float cy = cosf(ry);
float sx = sinf(rx);
float cx = cosf(rx);
float sz = sinf(rz);
float cz = cosf(rz);
init_matrix(temp);
temp[0] = (cy * cz) - (sx * sy * sz);
temp[1] = (cz * sx * sy) + (cy * sz);
temp[2] = -cx * sy;
temp[4] = -cx * sz;
temp[5] = cx * cz;
temp[6] = sx;
temp[8] = (cz * sy) + (cy * sx * sz);
temp[9] = (-cy * cz * sx) + (sy * sz);
temp[10] = cx * cy;
multiply_matrix(matrix, matrix, temp);
}
static int
view_set_ortho(float result[16], const float left, const float right,
const float bottom, const float top, const float near_,
const float far_)
{
if ((right - left) == 0.0f || (top - bottom) == 0.0f || (far_ - near_) == 0.0f)
return 0;
result[0] = 2.0f / (right - left);
result[1] = 0.0f;
result[2] = 0.0f;
result[3] = 0.0f;
result[4] = 0.0f;
result[5] = 2.0f / (top - bottom);
result[6] = 0.0f;
result[7] = 0.0f;
result[8] = 0.0f;
result[9] = 0.0f;
result[10] = -2.0f / (far_ - near_);
result[11] = 0.0f;
result[12] = -(right + left) / (right - left);
result[13] = -(top + bottom) / (top - bottom);
result[14] = -(far_ + near_) / (far_ - near_);
result[15] = 1.0f;
return 1;
}
static void
init_shaders(GLData *gl_data)
{
Evas_GL_API *gl = gl_data->glapi;
const char *p;
p = vertex_shader;
gl_data->vtx_shader = gl->glCreateShader(GL_VERTEX_SHADER);
gl->glShaderSource(gl_data->vtx_shader, 1, &p, NULL);
gl->glCompileShader(gl_data->vtx_shader);
p = fragment_shader;
gl_data->fgmt_shader = gl->glCreateShader(GL_FRAGMENT_SHADER);
gl->glShaderSource(gl_data->fgmt_shader, 1, &p, NULL);
gl->glCompileShader(gl_data->fgmt_shader);
gl_data->program = gl->glCreateProgram();
gl->glAttachShader(gl_data->program, gl_data->vtx_shader);
gl->glAttachShader(gl_data->program, gl_data->fgmt_shader);
gl->glBindAttribLocation(gl_data->program, 0, "vPosition");
gl->glBindAttribLocation(gl_data->program, 1, "inColor");
gl->glLinkProgram(gl_data->program);
gl->glUseProgram(gl_data->program);
gl->glEnable(GL_DEPTH_TEST);
}
static void
img_pixel_cb(void *data, Evas_Object *obj)
{
//Define the model view projection matrix
float model[16], mvp[16];
GLData *gl_data = data;
Evas_GL_API *glapi = gl_data->glapi;
Evas_Coord w, h;
evas_object_image_size_get(obj, &w, &h);
//Set up the context and surface as the current one
evas_gl_make_current(gl_data->evasgl, gl_data->sfc, gl_data->ctx);
//Initialize gl stuff just one time.
if (!gl_data->initialized)
{
float aspect;
init_shaders(gl_data);
glapi->glGenBuffers(1, &gl_data->vbo);
glapi->glBindBuffer(GL_ARRAY_BUFFER, gl_data->vbo);
glapi->glBufferData(GL_ARRAY_BUFFER, 3 * 72 * 4, cube_vertices,GL_STATIC_DRAW);
init_matrix(gl_data->view);
if(w > h)
{
aspect = (float)w/h;
view_set_ortho(gl_data->view, -1.0 * aspect, 1.0 * aspect, -1.0, 1.0, -1.0, 1.0);
}
else
{
aspect = (float)h/w;
view_set_ortho(gl_data->view, -1.0, 1.0, -1.0 * aspect, 1.0 * aspect, -1.0, 1.0);
}
gl_data->initialized = EINA_TRUE;
}
glapi->glViewport(0, 0, w, h);
glapi->glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glapi->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
init_matrix(model);
rotate_xyz(model, gl_data->xangle, gl_data->yangle, 0.0f);
multiply_matrix(mvp, gl_data->view, model);
glapi->glUseProgram(gl_data->program);
glapi->glBindBuffer(GL_ARRAY_BUFFER, gl_data->vbo);
glapi->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(float) * 6, 0);
glapi->glEnableVertexAttribArray(0);
glapi->glBindBuffer(GL_ARRAY_BUFFER, gl_data->vbo);
glapi->glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(float) * 6, (void*)(sizeof(float)*3));
glapi->glEnableVertexAttribArray(1);
glapi->glUniformMatrix4fv( glapi->glGetUniformLocation(gl_data->program, "mvpMatrix"), 1, GL_FALSE, mvp);
glapi->glDrawArrays(GL_TRIANGLES, 0, 36);
glapi->glFinish();
}
static void
img_del_cb(void *data, Evas *e EINA_UNUSED, Evas_Object *obj EINA_UNUSED, void *event_info EINA_UNUSED)
{
GLData *gl_data = data;
Evas_GL_API *glapi = gl_data->glapi;
//Free the gl resources when image object is deleted.
evas_gl_make_current(gl_data->evasgl, gl_data->sfc, gl_data->ctx);
glapi->glDeleteShader(gl_data->vtx_shader);
glapi->glDeleteShader(gl_data->fgmt_shader);
glapi->glDeleteProgram(gl_data->program);
glapi->glDeleteBuffers(1, &gl_data->vbo);
evas_gl_surface_destroy(gl_data->evasgl, gl_data->sfc);
evas_gl_context_destroy(gl_data->evasgl, gl_data->ctx);
evas_gl_free(gl_data->evasgl);
}
static Eina_Bool
_animator_cb(void *data)
{
Evas_Object *img = data;
//Animate here whenever an animation tick happens and then mark the image as
//"dirty" meaning it needs an update next time evas renders. it will call the
//pixel get callback then.
evas_object_image_pixels_dirty_set(img, EINA_TRUE);
return ECORE_CALLBACK_RENEW;
}
static void
_mouse_down_cb(void *data, Evas *e EINA_UNUSED, Evas_Object *obj EINA_UNUSED, void *event_info EINA_UNUSED)
{
GLData *gl_data = data;
gl_data->mouse_down = EINA_TRUE;
}
static void
_mouse_move_cb(void *data, Evas *e EINA_UNUSED, Evas_Object *obj EINA_UNUSED, void *event_info)
{
Evas_Event_Mouse_Move *ev;
ev = (Evas_Event_Mouse_Move *)event_info;
GLData *gl_data = data;
float dx = 0, dy = 0;
evas_damage_rectangle_add(e, 0, 0, WIDTH, HEIGHT);
if( gl_data->mouse_down)
{
dx = (ev->cur.canvas.x - ev->prev.canvas.x);
dy = (ev->cur.canvas.y - ev->prev.canvas.y);
gl_data->xangle += dy;
gl_data->yangle += dx;
}
}
static void
_mouse_up_cb(void *data, Evas *e EINA_UNUSED, Evas_Object *obj EINA_UNUSED, void *event_info EINA_UNUSED)
{
GLData *gl_data = data;
gl_data->mouse_down = EINA_FALSE;
}
static void
_win_resize_cb(void *data, Evas *e EINA_UNUSED, Evas_Object *obj, void *event_info EINA_UNUSED)
{
float aspect;
Evas_Coord w,h;
evas_object_geometry_get( obj, NULL, NULL, &w, &h);
GLData *gl_data = data;
evas_object_resize(gl_data->img, w, h);
init_matrix(gl_data->view);
if(w > h)
{
aspect = (float)w/h;
view_set_ortho(gl_data->view, (-1.0 * aspect), (1.0 * aspect), -1.0, 1.0, -1.0, 1.0);
}
else
{
aspect = (float)h/w;
view_set_ortho(gl_data->view, -1.0, 1.0, (-1.0 * aspect), (1.0 * aspect), -1.0, 1.0);
}
}
static void
evas_gl_exam(Evas_Object *win)
{
Evas_Native_Surface ns;
//Config for the surface for evas gl
Evas_GL_Config *config = evas_gl_config_new();
config->color_format = EVAS_GL_RGBA_8888;
config->depth_bits = EVAS_GL_DEPTH_BIT_24;
//Get the window size
Evas_Coord w,h;
evas_object_geometry_get(win, NULL, NULL, &w, &h);
//Get the evas gl handle for doing gl things
gldata.evasgl = evas_gl_new(evas_object_evas_get(win));
gldata.glapi = evas_gl_api_get(gldata.evasgl);
//Create a surface and context
gldata.sfc = evas_gl_surface_create(gldata.evasgl, config, w, h);
gldata.ctx = evas_gl_context_create(gldata.evasgl, NULL);
evas_gl_config_free(config);
//Set rotation variables
gldata.xangle = 45.0f;
gldata.yangle = 45.0f;
gldata.mouse_down = EINA_FALSE;
//Set up the image object. A filled one by default.
gldata.img = evas_object_image_filled_add(evas_object_evas_get(win));
evas_object_event_callback_add(gldata.img, EVAS_CALLBACK_DEL, img_del_cb, &gldata);
//Set up an actual pixel size for the buffer data. It may be different to the
//output size. Any windowing system has something like this, just evas has 2
//sizes, a pixel size and the output object size.
evas_object_image_size_set(gldata.img, w, h);
//Set up the native surface info to use the context and surface created
//above.
evas_gl_native_surface_get(gldata.evasgl, gldata.sfc, &ns);
evas_object_image_native_surface_set(gldata.img, &ns);
evas_object_image_pixels_get_callback_set(gldata.img, img_pixel_cb, &gldata);
evas_object_resize(gldata.img, w, h);
evas_object_show(gldata.img);
evas_object_image_pixels_dirty_set(gldata.img, EINA_TRUE);
//Add Mouse Event Callbacks
evas_object_event_callback_add(gldata.img, EVAS_CALLBACK_MOUSE_DOWN, _mouse_down_cb, &gldata);
evas_object_event_callback_add(gldata.img, EVAS_CALLBACK_MOUSE_UP, _mouse_up_cb, &gldata);
evas_object_event_callback_add(gldata.img, EVAS_CALLBACK_MOUSE_MOVE, _mouse_move_cb, &gldata);
//Add Window Resize Event Callback
evas_object_event_callback_add(win, EVAS_CALLBACK_RESIZE, _win_resize_cb, &gldata);
//ecore_animator_add(_animator_cb, gldata.img);
}
static void
_on_delete_cb(Ecore_Evas *ee EINA_UNUSED)
{
ecore_main_loop_quit();
}
static void
_on_canvas_resize_cb(Ecore_Evas *ee)
{
int w, h;
ecore_evas_geometry_get(ee, NULL, NULL, &w, &h);
evas_object_resize(gldata.win, w, h);
}
static Eina_Bool
breakshit2(void *data)
{
evas_object_del(data);
return EINA_FALSE;
}
static Eina_Bool
breakshit()
{
Evas_Native_Surface ns;
Evas_Object *img = evas_object_image_filled_add(evas_object_evas_get(gldata.win));
evas_object_image_size_set(img, WIDTH, HEIGHT);
evas_object_resize(img, WIDTH / 2, HEIGHT / 2);
evas_object_show(img);
evas_gl_native_surface_get(gldata.evasgl, gldata.sfc, &ns);
evas_object_image_native_surface_set(img, &ns);
evas_object_image_pixels_dirty_set(img, 1);
ecore_timer_add(0.05, breakshit2, img);
return EINA_FALSE;
}
int
main(void)
{
if (!ecore_evas_init()) return 0;
Ecore_Evas *ecore_evas = ecore_evas_new("opengl_x11", 0, 0, WIDTH, HEIGHT, NULL);
if(!ecore_evas) return 0;
ecore_evas_callback_delete_request_set(ecore_evas, _on_delete_cb);
ecore_evas_callback_resize_set(ecore_evas, _on_canvas_resize_cb);
ecore_evas_show(ecore_evas);
Evas_Object *evas = ecore_evas_get(ecore_evas);
gldata.win = evas_object_rectangle_add(evas);
evas_object_color_set(gldata.win, 255, 255, 255, 255);
evas_object_resize(gldata.win, WIDTH, HEIGHT);
evas_object_show(gldata.win);
evas_gl_exam(gldata.win);
ecore_timer_add(0.1, breakshit, NULL);
ecore_main_loop_begin();
ecore_evas_free(ecore_evas);
ecore_evas_shutdown();
return 0;
}
zmike created this paste.May 31 2018, 4:13 AM
zmike created this object with visibility "Public (No Login Required)".