323 lines
8.5 KiB
C++
323 lines
8.5 KiB
C++
/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// OpenGL ES 2.0 code
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#include <jni.h>
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#include <android/log.h>
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#include <opencv2/core/core.hpp>
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#include <opencv2/imgproc/imgproc.hpp>
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#include <GLES2/gl2.h>
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#include <GLES2/gl2ext.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <stdint.h>
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#include "glcamera.h"
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#include "image_pool.h"
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using namespace cv;
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#define LOG_TAG "libandroid-opencv"
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#define LOGI(...) __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
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#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)
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static void printGLString(const char *name, GLenum s)
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{
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const char *v = (const char *)glGetString(s);
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LOGI("GL %s = %s\n", name, v);
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}
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static void checkGlError(const char* op)
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{
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for (GLint error = glGetError(); error; error = glGetError())
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{
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LOGI("after %s() glError (0x%x)\n", op, error);
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}
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}
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static const char gVertexShader[] = "attribute vec4 a_position; \n"
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"attribute vec2 a_texCoord; \n"
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"varying vec2 v_texCoord; \n"
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"void main() \n"
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"{ \n"
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" gl_Position = a_position; \n"
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" v_texCoord = a_texCoord; \n"
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"} \n";
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static const char gFragmentShader[] = "precision mediump float; \n"
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"varying vec2 v_texCoord; \n"
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"uniform sampler2D s_texture; \n"
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"void main() \n"
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"{ \n"
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" gl_FragColor = texture2D( s_texture, v_texCoord );\n"
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"} \n";
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const GLfloat gTriangleVertices[] = {0.0f, 0.5f, -0.5f, -0.5f, 0.5f, -0.5f};
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GLubyte testpixels[4 * 3] = {255, 0, 0, // Red
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0, 255, 0, // Green
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0, 0, 255, // Blue
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255, 255, 0 // Yellow
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};
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GLuint glcamera::createSimpleTexture2D(GLuint _textureid, GLubyte* pixels, int width, int height, int channels)
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{
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// Bind the texture
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glActiveTexture( GL_TEXTURE0);
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checkGlError("glActiveTexture");
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// Bind the texture object
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glBindTexture(GL_TEXTURE_2D, _textureid);
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checkGlError("glBindTexture");
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GLenum format;
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switch (channels)
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{
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case 3:
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format = GL_RGB;
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break;
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case 1:
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format = GL_LUMINANCE;
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break;
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case 4:
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format = GL_RGBA;
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break;
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}
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// Load the texture
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glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, GL_UNSIGNED_BYTE, pixels);
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checkGlError("glTexImage2D");
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// Set the filtering mode
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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return _textureid;
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}
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GLuint glcamera::loadShader(GLenum shaderType, const char* pSource)
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{
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GLuint shader = glCreateShader(shaderType);
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if (shader)
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{
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glShaderSource(shader, 1, &pSource, NULL);
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glCompileShader(shader);
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GLint compiled = 0;
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glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
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if (!compiled)
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{
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GLint infoLen = 0;
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glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &infoLen);
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if (infoLen)
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{
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char* buf = (char*)malloc(infoLen);
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if (buf)
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{
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glGetShaderInfoLog(shader, infoLen, NULL, buf);
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LOGE("Could not compile shader %d:\n%s\n",
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shaderType, buf);
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free(buf);
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}
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glDeleteShader(shader);
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shader = 0;
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}
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}
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}
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return shader;
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}
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GLuint glcamera::createProgram(const char* pVertexSource, const char* pFragmentSource)
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{
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GLuint vertexShader = loadShader(GL_VERTEX_SHADER, pVertexSource);
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if (!vertexShader)
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{
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return 0;
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}
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GLuint pixelShader = loadShader(GL_FRAGMENT_SHADER, pFragmentSource);
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if (!pixelShader)
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{
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return 0;
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}
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GLuint program = glCreateProgram();
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if (program)
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{
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glAttachShader(program, vertexShader);
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checkGlError("glAttachShader");
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glAttachShader(program, pixelShader);
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checkGlError("glAttachShader");
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glLinkProgram(program);
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GLint linkStatus = GL_FALSE;
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glGetProgramiv(program, GL_LINK_STATUS, &linkStatus);
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if (linkStatus != GL_TRUE)
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{
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GLint bufLength = 0;
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glGetProgramiv(program, GL_INFO_LOG_LENGTH, &bufLength);
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if (bufLength)
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{
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char* buf = (char*)malloc(bufLength);
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if (buf)
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{
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glGetProgramInfoLog(program, bufLength, NULL, buf);
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LOGE("Could not link program:\n%s\n", buf);
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free(buf);
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}
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}
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glDeleteProgram(program);
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program = 0;
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}
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}
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return program;
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}
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//GLuint textureID;
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bool glcamera::setupGraphics(int w, int h)
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{
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printGLString("Version", GL_VERSION);
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printGLString("Vendor", GL_VENDOR);
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printGLString("Renderer", GL_RENDERER);
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printGLString("Extensions", GL_EXTENSIONS);
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LOGI("setupGraphics(%d, %d)", w, h);
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gProgram = createProgram(gVertexShader, gFragmentShader);
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if (!gProgram)
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{
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LOGE("Could not create program.");
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return false;
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}
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gvPositionHandle = glGetAttribLocation(gProgram, "a_position");
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gvTexCoordHandle = glGetAttribLocation(gProgram, "a_texCoord");
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gvSamplerHandle = glGetAttribLocation(gProgram, "s_texture");
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// Use tightly packed data
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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// Generate a texture object
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glGenTextures(1, &textureID);
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textureID = createSimpleTexture2D(textureID, testpixels, 2, 2, 3);
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checkGlError("glGetAttribLocation");
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LOGI("glGetAttribLocation(\"vPosition\") = %d\n",
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gvPositionHandle);
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glViewport(0, 0, w, h);
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checkGlError("glViewport");
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return true;
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}
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void glcamera::renderFrame()
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{
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GLfloat vVertices[] = {-1.0f, 1.0f, 0.0f, // Position 0
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0.0f, 0.0f, // TexCoord 0
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-1.0f, -1.0f, 0.0f, // Position 1
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0.0f, 1.0f, // TexCoord 1
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1.0f, -1.0f, 0.0f, // Position 2
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1.0f, 1.0f, // TexCoord 2
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1.0f, 1.0f, 0.0f, // Position 3
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1.0f, 0.0f // TexCoord 3
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};
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GLushort indices[] = {0, 1, 2, 0, 2, 3};
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GLsizei stride = 5 * sizeof(GLfloat); // 3 for position, 2 for texture
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glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
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checkGlError("glClearColor");
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glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
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checkGlError("glClear");
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glUseProgram(gProgram);
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checkGlError("glUseProgram");
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// Load the vertex position
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glVertexAttribPointer(gvPositionHandle, 3, GL_FLOAT, GL_FALSE, stride, vVertices);
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// Load the texture coordinate
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glVertexAttribPointer(gvTexCoordHandle, 2, GL_FLOAT, GL_FALSE, stride, &vVertices[3]);
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glEnableVertexAttribArray(gvPositionHandle);
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glEnableVertexAttribArray(gvTexCoordHandle);
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// Bind the texture
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glActiveTexture( GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, textureID);
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// Set the sampler texture unit to 0
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glUniform1i(gvSamplerHandle, 0);
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glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, indices);
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//checkGlError("glVertexAttribPointer");
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//glEnableVertexAttribArray(gvPositionHandle);
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//checkGlError("glEnableVertexAttribArray");
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//glDrawArrays(GL_TRIANGLES, 0, 3);
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//checkGlError("glDrawArrays");
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}
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void glcamera::init(int width, int height)
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{
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newimage = false;
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nimg = Mat();
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setupGraphics(width, height);
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}
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void glcamera::step()
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{
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if (newimage && !nimg.empty())
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{
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textureID = createSimpleTexture2D(textureID, nimg.ptr<unsigned char> (0), nimg.rows, nimg.cols, nimg.channels());
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newimage = false;
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}
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renderFrame();
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}
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#define NEAREST_POW2(x)((int)(0.5 + std::log(x)/0.69315) )
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void glcamera::setTextureImage(const Mat& img)
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{
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Size size(256, 256);
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resize(img, nimg, size, cv::INTER_NEAREST);
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newimage = true;
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}
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void glcamera::drawMatToGL(int idx, image_pool* pool)
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{
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Mat img = pool->getImage(idx);
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if (img.empty())
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return; //no image at input_idx!
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setTextureImage(img);
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}
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glcamera::glcamera() :
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newimage(false)
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{
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LOGI("glcamera constructor");
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}
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glcamera::~glcamera()
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{
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LOGI("glcamera destructor");
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}
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