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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <EGL/egl.h>
#include <GLES2/gl2.h>
#include <system/graphics.h>
#include "util.h"
void matrix_init_ortho(GLfloat *m, float w, float h) {
m[0] = 2.0 / w;
m[1] = 0.0;
m[2] = 0.0;
m[3] = -1.0;
m[4] = 0.0;
m[5] = 2.0 / h;
m[6] = 0.0;
m[7] = -1.0;
m[8] = 0.0;
m[9] = 0.0;
m[10] -1.0;
m[11] = 0.0;
m[12] = 0.0;
m[13] = 0.0;
m[14] = 0.0;
m[15] = 1.0;
}
static GLuint load_shader(GLenum shaderType, const char *src) {
GLint status = 0, len = 0;
GLuint shader;
if (!(shader = glCreateShader(shaderType)))
return 0;
glShaderSource(shader, 1, &src, NULL);
glCompileShader(shader);
glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
if (status)
return shader;
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &len);
if (len) {
char *msg = malloc(len);
if (msg) {
glGetShaderInfoLog(shader, len, NULL, msg);
msg[len-1] = 0;
fprintf(stderr, "error compiling shader:\n%s\n", msg);
free(msg);
}
}
glDeleteShader(shader);
return 0;
}
GLuint load_program(const char *vert_src, const char *frag_src) {
GLuint vert, frag, prog;
GLint status = 0, len = 0;
if (!(vert = load_shader(GL_VERTEX_SHADER, vert_src)))
return 0;
if (!(frag = load_shader(GL_FRAGMENT_SHADER, frag_src)))
goto fail_frag;
if (!(prog = glCreateProgram()))
goto fail_prog;
glAttachShader(prog, vert);
glAttachShader(prog, frag);
glLinkProgram(prog);
glGetProgramiv(prog, GL_LINK_STATUS, &status);
if (status)
return prog;
glGetProgramiv(prog, GL_INFO_LOG_LENGTH, &len);
if (len) {
char *buf = (char*) malloc(len);
if (buf) {
glGetProgramInfoLog(prog, len, NULL, buf);
buf[len-1] = 0;
fprintf(stderr, "error linking program:\n%s\n", buf);
free(buf);
}
}
glDeleteProgram(prog);
fail_prog:
glDeleteShader(frag);
fail_frag:
glDeleteShader(vert);
return 0;
}
int select_config_for_window(EGLDisplay dpy, EGLint *attr,
unsigned format, EGLConfig *config) {
EGLint R,G,B,A,r,g,b,a;
EGLint i, n, max;
EGLConfig *cfg;
switch (format) {
case HAL_PIXEL_FORMAT_RGBA_8888:
case HAL_PIXEL_FORMAT_BGRA_8888:
R = G = B = A = 8;
break;
case HAL_PIXEL_FORMAT_RGB_565:
R = 5; G = 6; B = 5; A = 0;
break;
default:
fprintf(stderr, "unknown fb pixel format %d\n", format);
return -1;
}
if (eglGetConfigs(dpy, NULL, 0, &max) == EGL_FALSE) {
fprintf(stderr, "no EGL configurations available?!\n");
return -1;
}
cfg = (EGLConfig*) malloc(sizeof(EGLConfig) * max);
if (!cfg)
return -1;
if (eglChooseConfig(dpy, attr, cfg, max, &n) == EGL_FALSE) {
fprintf(stderr, "eglChooseConfig failed\n");
return -1;
}
for (i = 0; i < n; i++) {
EGLint r,g,b,a;
eglGetConfigAttrib(dpy, cfg[i], EGL_RED_SIZE, &r);
eglGetConfigAttrib(dpy, cfg[i], EGL_GREEN_SIZE, &g);
eglGetConfigAttrib(dpy, cfg[i], EGL_BLUE_SIZE, &b);
eglGetConfigAttrib(dpy, cfg[i], EGL_ALPHA_SIZE, &a);
if (r == R && g == G && b == B && a == A) {
*config = cfg[i];
free(cfg);
return 0;
}
}
fprintf(stderr, "cannot find matching config\n");
free(cfg);
return -1;
}
static struct CNativeWindow *_cnw = 0;
int egl_create(EGLDisplay *_display, EGLSurface *_surface, int *_w, int *_h) {
EGLBoolean res;
EGLConfig config = { 0 };
EGLint context_attrs[] = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
EGLint config_attrs[] = {
EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
EGL_NONE };
EGLint major, minor;
EGLContext context;
EGLSurface surface;
EGLint w, h;
EGLDisplay display;
EGLNativeWindowType window;
unsigned width, height, format;
struct CNativeWindow *cnw;
display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
if (display == EGL_NO_DISPLAY)
return -1;
if (!(res = eglInitialize(display, &major, &minor)))
return -1;
fprintf(stderr, "egl version: %d.%d\n", major, minor);
if ((cnw = cnw_create()) == 0)
return -1;
cnw_info(cnw, &width, &height, &format);
window = (EGLNativeWindowType) cnw;
if ((res = select_config_for_window(display, config_attrs, format, &config)))
goto fail;
surface = eglCreateWindowSurface(display, config, window, NULL);
if (surface == EGL_NO_SURFACE)
goto fail;
context = eglCreateContext(display, config, EGL_NO_CONTEXT, context_attrs);
if (context == EGL_NO_CONTEXT)
goto fail;
if (!(res = eglMakeCurrent(display, surface, surface, context)))
goto fail;
eglQuerySurface(display, surface, EGL_WIDTH, &w);
eglQuerySurface(display, surface, EGL_HEIGHT, &h);
fprintf(stderr, "window: %d x %d\n", w, h);
*_display = display;
*_surface = surface;
*_w = w;
*_h = h;
_cnw = cnw;
return 0;
fail:
cnw_destroy(cnw);
return -1;
}
void egl_destroy(EGLDisplay display, EGLSurface surface) {
if (_cnw) {
eglDestroySurface(display, surface);
eglTerminate(display);
cnw_destroy(_cnw);
_cnw = 0;
}
}
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