dodanie textur

texture.cpp

@@ -0,0 +1,188 @@
+#include "texture.hpp"
+
+GLuint loadBMP_custom(const char * imagepath){
+
+	return 0;
+
+	timestampedCout("texture.cpp: Reading image " << imagepath << "...");
+
+	// Data read from the header of the BMP file
+	unsigned char header[54];
+	unsigned int dataPos;
+	unsigned int imageSize;
+	unsigned int width, height;
+	// Actual RGB data
+	unsigned char * data;
+
+	// Open the file
+	FILE * file = fopen(imagepath, "rb");
+	if (!file) {
+		timestampedCout("texture.cpp: " << imagepath << " could not be opened. Are you in the right directory?");
+		return 0;
+	}
+
+	// Read the header, i.e. the 54 first bytes
+
+	// If less than 54 bytes are read, problem
+	if (fread(header, 1, 54, file) != 54) {
+		timestampedCout("texture.cpp: Not a correct BMP file.");
+		fclose(file);
+		return 0;
+	}
+	// A BMP files always begins with "BM"
+	if (header[0] != 'B' || header[1] != 'M') {
+		timestampedCout("texture.cpp: Not a correct BMP file.");
+		fclose(file);
+		return 0;
+	}
+	// Make sure this is a 24bpp file
+	if (*(int*)&(header[0x1E]) !=  0) { timestampedCout("texture.cpp: Not a correct BMP file."); fclose(file); return 0;}
+	if (*(int*)&(header[0x1C]) != 24) { timestampedCout("texture.cpp: Not a correct BMP file."); fclose(file); return 0;}
+
+	// Read the information about the image
+	dataPos   = *(int*)&(header[0x0A]);
+	imageSize = *(int*)&(header[0x22]);
+	width     = *(int*)&(header[0x12]);
+	height    = *(int*)&(header[0x16]);
+
+	// Some BMP files are misformatted, guess missing information
+	if (imageSize == 0) imageSize = width * height * 3; // 3 : one byte for each Red, Green and Blue component
+	if (dataPos   == 0) dataPos = 54;                   // The BMP header is done that way
+
+	// Create a buffer
+	data = new unsigned char [imageSize];
+
+	// Read the actual data from the file into the buffer
+	fread(data, 1, imageSize, file);
+
+	// Everything is in memory now, the file can be closed.
+	fclose(file);
+
+	// Create one OpenGL texture
+	GLuint textureID;
+	glGenTextures(1, &textureID);
+	
+	// "Bind" the newly created texture : all future texture functions will modify this texture
+	glBindTexture(GL_TEXTURE_2D, textureID);
+
+	// Give the image to OpenGL
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_BGR, GL_UNSIGNED_BYTE, data);
+
+	// OpenGL has now copied the data. Free our own version
+	delete [] data;
+
+	// Poor filtering, or ...
+	//glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	//glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+
+	// ... nice trilinear filtering ...
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+	// ... which requires mipmaps. Generate them automatically.
+	glGenerateMipmap(GL_TEXTURE_2D);
+
+	// Return the ID of the texture we just created
+	return textureID;
+}
+
+#define FOURCC_DXT1 0x31545844 // Equivalent to "DXT1" in ASCII
+#define FOURCC_DXT3 0x33545844 // Equivalent to "DXT3" in ASCII
+#define FOURCC_DXT5 0x35545844 // Equivalent to "DXT5" in ASCII
+
+GLuint loadDDS(const char * imagepath){
+
+	return 0;
+
+	unsigned char header[124];
+
+	FILE *fp;
+ 
+	// timestampedCout("texture.cpp: Hello!");
+
+	/* try to open the file */
+	fp = fopen(imagepath, "rb");
+	if (fp == NULL){
+		timestampedCout("texture.cpp: " << imagepath << " could not be opened. Are you in the right directory?");
+		return 0;
+	}
+
+	/* verify the type of file */
+	char filecode[4];
+	fread(filecode, 1, 4, fp);
+	if (strncmp(filecode, "DDS ", 4) != 0) {
+		fclose(fp);
+		return 0;
+	}
+	
+	/* get the surface desc */
+	fread(&header, 124, 1, fp);
+
+	unsigned int height      = *(unsigned int*)&(header[8 ]);
+	unsigned int width	     = *(unsigned int*)&(header[12]);
+	unsigned int linearSize	 = *(unsigned int*)&(header[16]);
+	unsigned int mipMapCount = *(unsigned int*)&(header[24]);
+	unsigned int fourCC      = *(unsigned int*)&(header[80]);
+
+ 
+	unsigned char * buffer;
+	unsigned int bufsize;
+	/* how big is it going to be including all mipmaps? */
+	bufsize = mipMapCount > 1 ? linearSize * 2 : linearSize;
+	buffer = (unsigned char*)malloc(bufsize * sizeof(unsigned char));
+	fread(buffer, 1, bufsize, fp);
+	/* close the file pointer */
+	fclose(fp);
+
+	unsigned int components = (fourCC == FOURCC_DXT1) ? 3 : 4;
+	unsigned int format;
+	switch(fourCC) {
+
+		case FOURCC_DXT1:
+			format = GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
+			break;
+		case FOURCC_DXT3:
+			format = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
+			break;
+		case FOURCC_DXT5:
+			format = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
+			break;
+		default:
+			free(buffer);
+			return 0;
+
+	}
+
+	// Create one OpenGL texture
+	GLuint textureID;
+	glGenTextures(1, &textureID);
+
+	// "Bind" the newly created texture : all future texture functions will modify this texture
+	glBindTexture(GL_TEXTURE_2D, textureID);
+	glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+	
+	unsigned int blockSize = (format == GL_COMPRESSED_RGBA_S3TC_DXT1_EXT) ? 8 : 16;
+	unsigned int offset = 0;
+
+	/* load the mipmaps */
+	for (unsigned int level = 0; level < mipMapCount && (width || height); ++level) {
+
+		unsigned int size = ((width + 3) / 4) * ((height + 3) / 4) * blockSize;
+		glCompressedTexImage2D(GL_TEXTURE_2D, level, format, width, height,
+			0, size, buffer + offset);
+	 
+		offset += size;
+		width  /= 2;
+		height /= 2;
+
+		// Deal with Non-Power-Of-Two textures. This code is not included in the webpage to reduce clutter.
+		if (width  < 1)  width = 1;
+		if (height < 1) height = 1;
+
+	}
+
+	free(buffer);
+	return textureID;
+
+}