/*
* Copyright (C) 2009 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.
*/
// OpenGL ES 2.0 code
#include <jni.h>
#include <android/log.h>
#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <stdint.h>
#include "glcamera.h"
#include "image_pool.h"
using namespace cv;
#define LOG_TAG "libandroid-opencv"
#define LOGI(...) __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)
static void printGLString(const char *name, GLenum s) {
const char *v = (const char *) glGetString(s);
LOGI("GL %s = %s\n", name, v);
}
static void checkGlError(const char* op) {
for (GLint error = glGetError(); error; error = glGetError()) {
LOGI("after %s() glError (0x%x)\n", op, error);
}
}
static const char gVertexShader[] = "attribute vec4 a_position; \n"
"attribute vec2 a_texCoord; \n"
"varying vec2 v_texCoord; \n"
"void main() \n"
"{ \n"
" gl_Position = a_position; \n"
" v_texCoord = a_texCoord; \n"
"} \n";
static const char gFragmentShader[] =
"precision mediump float; \n"
"varying vec2 v_texCoord; \n"
"uniform sampler2D s_texture; \n"
"void main() \n"
"{ \n"
" gl_FragColor = texture2D( s_texture, v_texCoord );\n"
"} \n";
const GLfloat gTriangleVertices[] = { 0.0f, 0.5f, -0.5f, -0.5f, 0.5f, -0.5f };
GLubyte testpixels[4 * 3] = { 255, 0, 0, // Red
0, 255, 0, // Green
0, 0, 255, // Blue
255, 255, 0 // Yellow
};
GLuint glcamera::createSimpleTexture2D(GLuint _textureid, GLubyte* pixels,
int width, int height, int channels) {
// Bind the texture
glActiveTexture(GL_TEXTURE0);
checkGlError("glActiveTexture");
// Bind the texture object
glBindTexture(GL_TEXTURE_2D, _textureid);
checkGlError("glBindTexture");
GLenum format;
switch (channels) {
case 3:
format = GL_RGB;
break;
case 1:
format = GL_LUMINANCE;
break;
case 4:
format = GL_RGBA;
break;
}
// Load the texture
glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format,
GL_UNSIGNED_BYTE, pixels);
checkGlError("glTexImage2D");
// Set the filtering mode
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
return _textureid;
}
GLuint glcamera::loadShader(GLenum shaderType, const char* pSource) {
GLuint shader = glCreateShader(shaderType);
if (shader) {
glShaderSource(shader, 1, &pSource, NULL);
glCompileShader(shader);
GLint compiled = 0;
glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
if (!compiled) {
GLint infoLen = 0;
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &infoLen);
if (infoLen) {
char* buf = (char*) malloc(infoLen);
if (buf) {
glGetShaderInfoLog(shader, infoLen, NULL, buf);
LOGE("Could not compile shader %d:\n%s\n",
shaderType, buf);
free(buf);
}
glDeleteShader(shader);
shader = 0;
}
}
}
return shader;
}
GLuint glcamera::createProgram(const char* pVertexSource,
const char* pFragmentSource) {
GLuint vertexShader = loadShader(GL_VERTEX_SHADER, pVertexSource);
if (!vertexShader) {
return 0;
}
GLuint pixelShader = loadShader(GL_FRAGMENT_SHADER, pFragmentSource);
if (!pixelShader) {
return 0;
}
GLuint program = glCreateProgram();
if (program) {
glAttachShader(program, vertexShader);
checkGlError("glAttachShader");
glAttachShader(program, pixelShader);
checkGlError("glAttachShader");
glLinkProgram(program);
GLint linkStatus = GL_FALSE;
glGetProgramiv(program, GL_LINK_STATUS, &linkStatus);
if (linkStatus != GL_TRUE) {
GLint bufLength = 0;
glGetProgramiv(program, GL_INFO_LOG_LENGTH, &bufLength);
if (bufLength) {
char* buf = (char*) malloc(bufLength);
if (buf) {
glGetProgramInfoLog(program, bufLength, NULL, buf);
LOGE("Could not link program:\n%s\n", buf);
free(buf);
}
}
glDeleteProgram(program);
program = 0;
}
}
return program;
}
//GLuint textureID;
bool glcamera::setupGraphics(int w, int h) {
printGLString("Version", GL_VERSION);
printGLString("Vendor", GL_VENDOR);
printGLString("Renderer", GL_RENDERER);
printGLString("Extensions", GL_EXTENSIONS);
LOGI("setupGraphics(%d, %d)", w, h);
gProgram = createProgram(gVertexShader, gFragmentShader);
if (!gProgram) {
LOGE("Could not create program.");
return false;
}
gvPositionHandle = glGetAttribLocation(gProgram, "a_position");
gvTexCoordHandle = glGetAttribLocation(gProgram, "a_texCoord");
gvSamplerHandle = glGetAttribLocation(gProgram, "s_texture");
// Use tightly packed data
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
// Generate a texture object
glGenTextures(1, &textureID);
textureID = createSimpleTexture2D(textureID, testpixels, 2, 2, 3);
checkGlError("glGetAttribLocation");
LOGI("glGetAttribLocation(\"vPosition\") = %d\n",
gvPositionHandle);
glViewport(0, 0, w, h);
checkGlError("glViewport");
return true;
}
void glcamera::renderFrame() {
GLfloat vVertices[] = { -1.0f, 1.0f, 0.0f, // Position 0
0.0f, 0.0f, // TexCoord 0
-1.0f, -1.0f, 0.0f, // Position 1
0.0f, 1.0f, // TexCoord 1
1.0f, -1.0f, 0.0f, // Position 2
1.0f, 1.0f, // TexCoord 2
1.0f, 1.0f, 0.0f, // Position 3
1.0f, 0.0f // TexCoord 3
};
GLushort indices[] = { 0, 1, 2, 0, 2, 3 };
GLsizei stride = 5 * sizeof(GLfloat); // 3 for position, 2 for texture
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
checkGlError("glClearColor");
glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
checkGlError("glClear");
glUseProgram(gProgram);
checkGlError("glUseProgram");
// Load the vertex position
glVertexAttribPointer(gvPositionHandle, 3, GL_FLOAT, GL_FALSE, stride,
vVertices);
// Load the texture coordinate
glVertexAttribPointer(gvTexCoordHandle, 2, GL_FLOAT, GL_FALSE, stride,
&vVertices[3]);
glEnableVertexAttribArray(gvPositionHandle);
glEnableVertexAttribArray(gvTexCoordHandle);
// Bind the texture
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, textureID);
// Set the sampler texture unit to 0
glUniform1i(gvSamplerHandle, 0);
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices);
//checkGlError("glVertexAttribPointer");
//glEnableVertexAttribArray(gvPositionHandle);
//checkGlError("glEnableVertexAttribArray");
//glDrawArrays(GL_TRIANGLES, 0, 3);
//checkGlError("glDrawArrays");
}
void glcamera::init(int width, int height) {
newimage = false;
nimg = Mat();
setupGraphics(width, height);
}
void glcamera::step() {
if (newimage && !nimg.empty()) {
textureID = createSimpleTexture2D(textureID,
nimg.ptr<unsigned char> (0), nimg.rows, nimg.cols,
nimg.channels());
newimage = false;
}
renderFrame();
}
void glcamera::setTextureImage(Ptr<Mat> img) {
//int p2 = (int)(std::log(img->size().width)/0.69315);
int sz = 256;//std::pow(2,p2);
Size size(sz, sz);
resize(*img, nimg, size,cv::INTER_NEAREST);
newimage = true;
}
void glcamera::drawMatToGL(int idx, image_pool* pool) {
Ptr<Mat> img = pool->getImage(idx);
if (img.empty())
return; //no image at input_idx!
setTextureImage(img);
}
glcamera::glcamera():newimage(false) {
LOGI("glcamera constructor");
}
glcamera::~glcamera() {
LOGI("glcamera destructor");
}