/
rectangle.c
139 lines (102 loc) · 3.32 KB
/
rectangle.c
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/*
* code stolen from openGL-RPi-tutorial-master/encode_OGL/
*/
#include <stdio.h>
#include <assert.h>
#include <math.h>
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <GLES2/gl2.h>
typedef struct
{
uint32_t screen_width;
uint32_t screen_height;
EGLDisplay display;
EGLSurface surface;
EGLContext context;
} CUBE_STATE_T;
CUBE_STATE_T state, *p_state = &state;
void init_ogl(CUBE_STATE_T *state)
{
int32_t success = 0;
EGLBoolean result;
EGLint num_config;
// bcm_host_init();
static EGL_DISPMANX_WINDOW_T nativewindow;
DISPMANX_ELEMENT_HANDLE_T dispman_element;
DISPMANX_DISPLAY_HANDLE_T dispman_display;
DISPMANX_UPDATE_HANDLE_T dispman_update;
VC_RECT_T dst_rect;
VC_RECT_T src_rect;
static const EGLint attribute_list[] =
{
EGL_RED_SIZE, 8,
EGL_GREEN_SIZE, 8,
EGL_BLUE_SIZE, 8,
EGL_ALPHA_SIZE, 8,
EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
EGL_NONE
};
static const EGLint context_attributes[] =
{
EGL_CONTEXT_CLIENT_VERSION, 2,
EGL_NONE
};
EGLConfig config;
// get an EGL display connection
state->display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
// initialize the EGL display connection
result = eglInitialize(state->display, NULL, NULL);
// get an appropriate EGL frame buffer configuration
result = eglChooseConfig(state->display, attribute_list, &config, 1, &num_config);
assert(EGL_FALSE != result);
// get an appropriate EGL frame buffer configuration
result = eglBindAPI(EGL_OPENGL_ES_API);
assert(EGL_FALSE != result);
// create an EGL rendering context
state->context = eglCreateContext(state->display, config, EGL_NO_CONTEXT, context_attributes);
assert(state->context!=EGL_NO_CONTEXT);
// create an EGL window surface
success = graphics_get_display_size(0 /* LCD */, &state->screen_width, &state->screen_height);
assert( success >= 0 );
state->screen_width = 1024;
state->screen_height = 1024;
dst_rect.x = 0;
dst_rect.y = 0;
dst_rect.width = state->screen_width;
dst_rect.height = state->screen_height;
src_rect.x = 0;
src_rect.y = 0;
src_rect.width = state->screen_width << 16;
src_rect.height = state->screen_height << 16;
dispman_display = vc_dispmanx_display_open( 0 /* LCD */);
dispman_update = vc_dispmanx_update_start( 0 );
dispman_element =
vc_dispmanx_element_add(dispman_update, dispman_display,
0/*layer*/, &dst_rect, 0/*src*/,
&src_rect, DISPMANX_PROTECTION_NONE,
0 /*alpha*/, 0/*clamp*/, 0/*transform*/);
nativewindow.element = dispman_element;
nativewindow.width = state->screen_width;
nativewindow.height = state->screen_height;
vc_dispmanx_update_submit_sync( dispman_update );
state->surface = eglCreateWindowSurface( state->display, config, &nativewindow, NULL );
assert(state->surface != EGL_NO_SURFACE);
// connect the context to the surface
result = eglMakeCurrent(state->display, state->surface, state->surface, state->context);
assert(EGL_FALSE != result);
}
int
main(int argc, char *argv[])
{
bcm_host_init();
init_ogl(p_state);
glClearColor(1.0, 0.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
glFlush();
eglSwapBuffers(p_state->display, p_state->surface);
while (1) {
sleep(10);
}
return 0;
}