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90 lines
4.0 KiB
90 lines
4.0 KiB
#include "utils.h"
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#pragma comment(lib,"SOIL.lib")
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unsigned char* DecodeBMP(unsigned char*bmpFileData, int&width, int&height) {
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if (0x4D42 == *((unsigned short*)bmpFileData)) {
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int pixelDataOffset = *((int*)(bmpFileData + 10));
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width = *((int*)(bmpFileData + 18));
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height = *((int*)(bmpFileData + 22));
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unsigned char*pixelData = bmpFileData + pixelDataOffset;
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for (int i = 0; i < width*height * 3; i += 3) {
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unsigned char temp = pixelData[i];
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pixelData[i] = pixelData[i + 2];
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pixelData[i + 2] = temp;
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}
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return pixelData;
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}
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return nullptr;
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}
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GLuint CreateTexture2D(unsigned char*pixelData, int width, int height, GLenum type) {
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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_MAG_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glTexImage2D(GL_TEXTURE_2D, 0, type, width, height, 0, type, GL_UNSIGNED_BYTE, pixelData);
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glBindTexture(GL_TEXTURE_2D, 0);
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return texture;
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}
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GLuint CreateTexture2DFromBMP(const char*bmpPath) {
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int nFileSize = 0;
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unsigned char *bmpFileContent = LoadFileContent(bmpPath, nFileSize);
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if (bmpFileContent == nullptr) {
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return 0;
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}
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int bmpWidth = 0, bmpHeight = 0;
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unsigned char*pixelData = DecodeBMP(bmpFileContent, bmpWidth, bmpHeight);
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if (bmpWidth == 0) {
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delete bmpFileContent;
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return 0;
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}
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GLuint texture = CreateTexture2D(pixelData, bmpWidth, bmpHeight, GL_RGB);
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delete bmpFileContent;
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return texture;
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}
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GLuint CreateTextureCubeFromBMP(const char *front, const char *back, const char *left,
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const char *right, const char *top, const char *bottom) {
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GLuint texture;
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glGenTextures(1, &texture);
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glBindTexture(GL_TEXTURE_CUBE_MAP, texture);
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int nFileSize = 0, width = 0, height = 0;
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
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unsigned char *bmpFileContent = LoadFileContent(front, nFileSize);
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unsigned char*pixelData = DecodeBMP(bmpFileContent, width, height);
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glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, pixelData);
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delete bmpFileContent;
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bmpFileContent = LoadFileContent(back, nFileSize);
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pixelData = DecodeBMP(bmpFileContent, width, height);
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glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Z, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, pixelData);
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delete bmpFileContent;
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bmpFileContent = LoadFileContent(left, nFileSize);
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pixelData = DecodeBMP(bmpFileContent, width, height);
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glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_X, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, pixelData);
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delete bmpFileContent;
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bmpFileContent = LoadFileContent(right, nFileSize);
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pixelData = DecodeBMP(bmpFileContent, width, height);
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glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, pixelData);
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delete bmpFileContent;
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bmpFileContent = LoadFileContent(top, nFileSize);
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pixelData = DecodeBMP(bmpFileContent, width, height);
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glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Y, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, pixelData);
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delete bmpFileContent;
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bmpFileContent = LoadFileContent(bottom, nFileSize);
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pixelData = DecodeBMP(bmpFileContent, width, height);
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glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, pixelData);
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glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
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delete bmpFileContent;
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return texture;
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}
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GLuint CreateTextureFromFile(const char*filePath)
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{
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GLuint texture = SOIL_load_OGL_texture(filePath, 0, 0, SOIL_FLAG_POWER_OF_TWO | SOIL_FLAG_INVERT_Y);
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return texture;
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}
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