added upng library for png loading and decoding

src/main.c

@@ -3,6 +3,7 @@
 #include <stdbool.h>
 #include <SDL2/SDL.h>
 #include <math.h>
+#include "upng.h"
 #include "display.h"
 #include "vector.h"
 #include "light.h"
@@ -39,7 +40,7 @@ void setup(void){
     // Creating a SDL texture that is used to display the color buffer
     color_buffer_texture = SDL_CreateTexture(
 	    renderer,
-	    SDL_PIXELFORMAT_ARGB8888,
+	    SDL_PIXELFORMAT_RGBA32,
 	    SDL_TEXTUREACCESS_STREAMING,
 	    window_width,
 	    window_height
@@ -53,14 +54,16 @@ void setup(void){
     proj_matrix = mat4_make_perspective(fov, aspect, znear, zfar);
    
     // Load the hardcoded texture data from the static array
-    mesh_texture = (uint32_t*)REDBRICK_TEXTURE;
+    //mesh_texture = (uint32_t*)REDBRICK_TEXTURE;
-    texture_width = 64;
+    //texture_width = 64;
-    texture_height = 64;
+    //texture_height = 64;
 
     // Loads the cube values in the mesh data structure
     load_cube_mesh_data();
+    load_png_texture_data("./assets/cube.png");
     //load_obj_file_data("./assets/f22.obj");
     //load_obj_file_data("./assets/cube.obj");
+
 }
 
 void process_input(void){
@@ -332,6 +335,7 @@ void render(void){
 // Free memory that was dynamically allocated
 void free_resources(void) {
     free(color_buffer);
+    upng_free(png_texture);
     array_free(mesh.faces);
     array_free(mesh.vertices);
 }

src/texture.c

@@ -1,10 +1,25 @@
 #include <stdio.h>
 #include <stdint.h>
+#include "texture.h"
 
 uint32_t* mesh_texture = NULL;
 int texture_width = 64;
 int texture_height = 64;
 
+upng_t* png_texture = NULL;
+
+void load_png_texture_data(char* filename) { 
+    png_texture = upng_new_from_file(filename);
+    if (png_texture != NULL) {
+        upng_decode(png_texture);
+        if (upng_get_error(png_texture) == UPNG_EOK) {
+            mesh_texture = (uint32_t*)upng_get_buffer(png_texture);
+            texture_width = upng_get_width(png_texture);
+            texture_height = upng_get_height(png_texture);
+        }
+    }
+}
+
 const uint8_t REDBRICK_TEXTURE[] = {
     0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff,
     0x54, 0x54, 0x54, 0xff, 0x38, 0x38, 0x38, 0xff, 0x54, 0x54, 0x54, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x54, 0x54, 0x54, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x54, 0x54, 0x54, 0xff, 0x48, 0x48, 0x48, 0xff, 0x38, 0x38, 0x38, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x54, 0x54, 0x54, 0xff, 0x54, 0x54, 0x54, 0xff, 0x54, 0x54, 0x54, 0xff, 0x54, 0x54, 0x54, 0xff, 0x54, 0x54, 0x54, 0xff, 0x54, 0x54, 0x54, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x54, 0x54, 0x54, 0xff, 0x54, 0x54, 0x54, 0xff, 0x54, 0x54, 0x54, 0xff, 0x54, 0x54, 0x54, 0xff, 0x54, 0x54, 0x54, 0xff, 0x54, 0x54, 0x54, 0xff, 0x54, 0x54, 0x54, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x38, 0x38, 0x38, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x54, 0x54, 0x54, 0xff, 0x54, 0x54, 0x54, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x48, 0x48, 0x48, 0xff, 0x38, 0x38, 0x38, 0xff,

src/texture.h

@@ -3,12 +3,16 @@
 
 #include <stdio.h>
 #include <stdint.h>
+#include "upng.h"
 
 typedef struct {
     float u;
     float v;
 } tex2_t;
 
+void load_png_texture_data(char* filename);
+
+extern upng_t* png_texture;
 extern int texture_width;
 extern int texture_height;
 extern uint32_t* mesh_texture;

src/upng.h

@@ -0,0 +1,81 @@
+/*
+uPNG -- derived from LodePNG version 20100808
+
+Copyright (c) 2005-2010 Lode Vandevenne
+Copyright (c) 2010 Sean Middleditch
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+		1. The origin of this software must not be misrepresented; you must not
+		claim that you wrote the original software. If you use this software
+		in a product, an acknowledgment in the product documentation would be
+		appreciated but is not required.
+
+		2. Altered source versions must be plainly marked as such, and must not be
+		misrepresented as being the original software.
+
+		3. This notice may not be removed or altered from any source
+		distribution.
+*/
+
+#if !defined(UPNG_H)
+#define UPNG_H
+
+typedef enum upng_error {
+	UPNG_EOK			= 0, /* success (no error) */
+	UPNG_ENOMEM			= 1, /* memory allocation failed */
+	UPNG_ENOTFOUND		= 2, /* resource not found (file missing) */
+	UPNG_ENOTPNG		= 3, /* image data does not have a PNG header */
+	UPNG_EMALFORMED		= 4, /* image data is not a valid PNG image */
+	UPNG_EUNSUPPORTED	= 5, /* critical PNG chunk type is not supported */
+	UPNG_EUNINTERLACED	= 6, /* image interlacing is not supported */
+	UPNG_EUNFORMAT		= 7, /* image color format is not supported */
+	UPNG_EPARAM			= 8  /* invalid parameter to method call */
+} upng_error;
+
+typedef enum upng_format {
+	UPNG_BADFORMAT,
+	UPNG_RGB8,
+	UPNG_RGB16,
+	UPNG_RGBA8,
+	UPNG_RGBA16,
+	UPNG_LUMINANCE1,
+	UPNG_LUMINANCE2,
+	UPNG_LUMINANCE4,
+	UPNG_LUMINANCE8,
+	UPNG_LUMINANCE_ALPHA1,
+	UPNG_LUMINANCE_ALPHA2,
+	UPNG_LUMINANCE_ALPHA4,
+	UPNG_LUMINANCE_ALPHA8
+} upng_format;
+
+typedef struct upng_t upng_t;
+
+upng_t*		upng_new_from_bytes	(const unsigned char* buffer, unsigned long size);
+upng_t*		upng_new_from_file	(const char* path);
+void		upng_free			(upng_t* upng);
+
+upng_error	upng_header			(upng_t* upng);
+upng_error	upng_decode			(upng_t* upng);
+
+upng_error	upng_get_error		(const upng_t* upng);
+unsigned	upng_get_error_line	(const upng_t* upng);
+
+unsigned	upng_get_width		(const upng_t* upng);
+unsigned	upng_get_height		(const upng_t* upng);
+unsigned	upng_get_bpp		(const upng_t* upng);
+unsigned	upng_get_bitdepth	(const upng_t* upng);
+unsigned	upng_get_components	(const upng_t* upng);
+unsigned	upng_get_pixelsize	(const upng_t* upng);
+upng_format	upng_get_format		(const upng_t* upng);
+
+const unsigned char*	upng_get_buffer		(const upng_t* upng);
+unsigned				upng_get_size		(const upng_t* upng);
+
+#endif /*defined(UPNG_H)*/