Add files via upload

2021-04-25 16:08:48 +03:00
commit e1cdcf01e9
49 changed files with 2866 additions and 0 deletions
@@ -0,0 +1,125 @@
+/*
+ * png_loading.cpp
+ *
+ *  Created on: Feb 10, 2020
+ *      Author: MihailRis
+ */
+
+#include "png_loading.h"
+
+#include <iostream>
+#include <GL/glew.h>
+#include <png.h>
+#include "../graphics/Texture.h"
+
+int _png_load(const char* file, int* width, int* height){
+    FILE *f;
+    int is_png, bit_depth, color_type, row_bytes;
+    png_infop info_ptr, end_info;
+    png_uint_32 t_width, t_height;
+    png_byte header[8], *image_data;
+    png_bytepp row_pointers;
+    png_structp png_ptr;
+    GLuint texture;
+    int alpha;
+
+    if ( !( f = fopen(file, "r" ) ) ) {
+        return 0;
+    }
+    fread( header, 1, 8, f );
+    is_png = !png_sig_cmp( header, 0, 8 );
+    if ( !is_png ) {
+        fclose( f );
+        return 0;
+    }
+    png_ptr = png_create_read_struct( PNG_LIBPNG_VER_STRING, NULL,
+        NULL, NULL );
+    if ( !png_ptr ) {
+        fclose( f );
+        return 0;
+    }
+    info_ptr = png_create_info_struct( png_ptr );
+    if ( !info_ptr ) {
+        png_destroy_read_struct( &png_ptr, (png_infopp) NULL,
+            (png_infopp) NULL );
+        fclose( f );
+        return 0;
+    }
+    end_info = png_create_info_struct( png_ptr );
+    if ( !end_info ) {
+        png_destroy_read_struct( &png_ptr, (png_infopp) NULL,
+            (png_infopp) NULL );
+        fclose( f );
+        return 0;
+    }
+    if ( setjmp( png_jmpbuf( png_ptr ) ) ) {
+        png_destroy_read_struct( &png_ptr, &info_ptr, &end_info );
+        fclose( f );
+        return 0;
+    }
+    png_init_io( png_ptr, f );
+    png_set_sig_bytes( png_ptr, 8 );
+    png_read_info( png_ptr, info_ptr );
+    png_get_IHDR( png_ptr, info_ptr, &t_width, &t_height, &bit_depth,
+        &color_type, NULL, NULL, NULL );
+    *width = t_width;
+    *height = t_height;
+    png_read_update_info( png_ptr, info_ptr );
+    row_bytes = png_get_rowbytes( png_ptr, info_ptr );
+    image_data = (png_bytep) malloc( row_bytes * t_height * sizeof(png_byte) );
+    if ( !image_data ) {
+        png_destroy_read_struct( &png_ptr, &info_ptr, &end_info );
+        fclose( f );
+        return 0;
+    }
+    row_pointers = (png_bytepp) malloc( t_height * sizeof(png_bytep) );
+    if ( !row_pointers ) {
+        png_destroy_read_struct( &png_ptr, &info_ptr, &end_info );
+        free( image_data );
+        fclose( f );
+        return 0;
+    }
+    for (unsigned int i = 0; i < t_height; ++i ) {
+        row_pointers[t_height - 1 - i] = image_data + i * row_bytes;
+    }
+    png_read_image( png_ptr, row_pointers );
+    switch ( png_get_color_type( png_ptr, info_ptr ) ) {
+        case PNG_COLOR_TYPE_RGBA:
+            alpha = GL_RGBA;
+            break;
+        case PNG_COLOR_TYPE_RGB:
+            alpha = GL_RGB;
+            break;
+        default:
+            printf( "Color type %d not supported!\n",
+                png_get_color_type( png_ptr, info_ptr ) );
+            png_destroy_read_struct( &png_ptr, &info_ptr, &end_info );
+            return 0;
+    }
+    glGenTextures(1, &texture);
+    glBindTexture(GL_TEXTURE_2D, texture);
+    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, t_width, t_height, 0,
+        alpha, GL_UNSIGNED_BYTE, (GLvoid *) image_data);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 4);
+    glGenerateMipmap(GL_TEXTURE_2D);
+    glBindTexture(GL_TEXTURE_2D, 0);
+
+    png_destroy_read_struct( &png_ptr, &info_ptr, &end_info );
+    free( image_data );
+    free( row_pointers );
+    fclose( f );
+    return texture;
+}
+
+Texture* load_texture(std::string filename){
+	int width, height;
+	GLuint texture = _png_load(filename.c_str(), &width, &height);
+	if (texture == 0){
+		std::cerr << "Could not load texture " << filename << std::endl;
+		return nullptr;
+	}
+	return new Texture(texture, width, height);
+}