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124 lines
3.5 KiB
124 lines
3.5 KiB
//
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// Copyright 2014 The ANGLE Project Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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//
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#include "tga_utils.h"
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#include <fstream>
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#include <iostream>
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#include <limits.h>
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#include <stdint.h>
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#include <string>
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TGAImage::TGAImage()
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: width(0), height(0), data(0)
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{
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}
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struct TGAHeader
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{
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uint8_t idSize;
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uint8_t mapType;
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uint8_t imageType;
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uint16_t paletteStart;
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uint16_t paletteSize;
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uint8_t paletteEntryDepth;
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uint16_t x;
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uint16_t y;
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uint16_t width;
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uint16_t height;
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uint8_t colorDepth;
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uint8_t descriptor;
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};
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#define INVERTED_BIT (1 << 5)
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template <typename dataType>
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void readBinary(std::ifstream &stream, dataType &item)
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{
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stream.read(reinterpret_cast<char *>(&item), sizeof(dataType));
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}
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template <typename dataType>
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void readBinary(std::ifstream &stream, std::vector<dataType> &items)
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{
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stream.read(reinterpret_cast<char *>(items.data()), sizeof(dataType) * items.size());
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}
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bool LoadTGAImageFromFile(const std::string &path, TGAImage *image)
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{
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std::ifstream stream(path, std::ios::binary);
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if (!stream)
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{
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std::cerr << "error opening tga file " << path << " for reading.\n";
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return false;
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}
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TGAHeader header;
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readBinary(stream, header.idSize);
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readBinary(stream, header.mapType);
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readBinary(stream, header.imageType);
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readBinary(stream, header.paletteStart);
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readBinary(stream, header.paletteSize);
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readBinary(stream, header.paletteEntryDepth);
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readBinary(stream, header.x);
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readBinary(stream, header.y);
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readBinary(stream, header.width);
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readBinary(stream, header.height);
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readBinary(stream, header.colorDepth);
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readBinary(stream, header.descriptor);
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image->width = header.width;
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image->height = header.height;
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size_t pixelComponentCount = header.colorDepth / CHAR_BIT;
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std::vector<unsigned char> buffer(header.width * header.height * pixelComponentCount);
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readBinary(stream, buffer);
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image->data.reserve(header.width * header.height);
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for (size_t y = 0; y < header.height; y++)
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{
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size_t rowIdx = ((header.descriptor & INVERTED_BIT) ? (header.height - 1 - y) : y) * header.width * pixelComponentCount;
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for (size_t x = 0; x < header.width; x++)
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{
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size_t pixelIdx = rowIdx + x * pixelComponentCount;
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Byte4 pixel;
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pixel[0] = (pixelComponentCount > 2) ? buffer[pixelIdx + 2] : 0;
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pixel[2] = (pixelComponentCount > 0) ? buffer[pixelIdx + 0] : 0;
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pixel[1] = (pixelComponentCount > 1) ? buffer[pixelIdx + 1] : 0;
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pixel[3] = (pixelComponentCount > 3) ? buffer[pixelIdx + 3] : 255;
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image->data.push_back(pixel);
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}
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}
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std::cout << "loaded image " << path << ".\n";
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return true;
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}
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GLuint LoadTextureFromTGAImage(const TGAImage &image)
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{
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if (image.width > 0 && image.height > 0)
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{
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GLuint texture;
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glGenTextures(1, &texture);
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glBindTexture(GL_TEXTURE_2D, texture);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, static_cast<GLsizei>(image.width), static_cast<GLsizei>(image.height), 0,
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GL_RGBA, GL_UNSIGNED_BYTE, image.data.data());
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glGenerateMipmap(GL_TEXTURE_2D);
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return texture;
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}
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else
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{
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return 0;
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}
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}
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