coffee_crisis/source/ltexture.cpp

#include <stdio.h>
#include <string>
#include "const.h"
#include "ltexture.h"
#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"

LTexture::LTexture()
{
	// Initialize
	mTexture = NULL;
	mWidth = 0;
	mHeight = 0;
}

LTexture::~LTexture()
{
	// Deallocate
	free();
}

bool LTexture::loadFromFile(std::string path, SDL_Renderer *renderer)
{
	int req_format = STBI_rgb_alpha;
	int width, height, orig_format;
	unsigned char *data = stbi_load(path.c_str(), &width, &height, &orig_format, req_format);
	if (data == NULL)
	{
		SDL_Log("Loading image failed: %s", stbi_failure_reason());
		exit(1);
	}

	int depth, pitch;
	Uint32 pixel_format;
	if (req_format == STBI_rgb)
	{
		depth = 24;
		pitch = 3 * width; // 3 bytes per pixel * pixels per row
		pixel_format = SDL_PIXELFORMAT_RGB24;
	}
	else
	{ // STBI_rgb_alpha (RGBA)
		depth = 32;
		pitch = 4 * width;
		pixel_format = SDL_PIXELFORMAT_RGBA32;
	}

	// Get rid of preexisting texture
	free();

	// The final texture
	SDL_Texture *newTexture = NULL;

	// Load image at specified path
	//SDL_Surface *loadedSurface = IMG_Load(path.c_str());
	SDL_Surface *loadedSurface = SDL_CreateRGBSurfaceWithFormatFrom((void*)data, width, height, depth, pitch, pixel_format);
	if (loadedSurface == NULL)
	{
		printf("Unable to load image %s!\n", path.c_str());
	}
	else
	{
		// Color key image
		SDL_SetColorKey(loadedSurface, SDL_TRUE, SDL_MapRGB(loadedSurface->format, COLOR_KEY_R, COLOR_KEY_G, COLOR_KEY_B));

		// Create texture from surface pixels
		newTexture = SDL_CreateTextureFromSurface(renderer, loadedSurface);
		if (newTexture == NULL)
		{
			printf("Unable to create texture from %s! SDL Error: %s\n", path.c_str(), SDL_GetError());
		}
		else
		{
			// Get image dimensions
			mWidth = loadedSurface->w;
			mHeight = loadedSurface->h;
		}

		// Get rid of old loaded surface
		SDL_FreeSurface(loadedSurface);
	}

	// Return success
	mTexture = newTexture;
	return mTexture != NULL;
}

bool LTexture::createBlank(SDL_Renderer *renderer, int width, int height, SDL_TextureAccess access)
{
	// Create uninitialized texture
	mTexture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA8888, access, width, height);
	if (mTexture == NULL)
	{
		printf("Unable to create blank texture! SDL Error: %s\n", SDL_GetError());
	}
	else
	{
		mWidth = width;
		mHeight = height;
	}

	return mTexture != NULL;
}

void LTexture::free()
{
	// Free texture if it exists
	if (mTexture != NULL)
	{
		SDL_DestroyTexture(mTexture);
		mTexture = NULL;
		mWidth = 0;
		mHeight = 0;
	}
}

void LTexture::setColor(Uint8 red, Uint8 green, Uint8 blue)
{
	// Modulate texture rgb
	SDL_SetTextureColorMod(mTexture, red, green, blue);
}

void LTexture::setBlendMode(SDL_BlendMode blending)
{
	// Set blending function
	SDL_SetTextureBlendMode(mTexture, blending);
}

void LTexture::setAlpha(Uint8 alpha)
{
	// Modulate texture alpha
	SDL_SetTextureAlphaMod(mTexture, alpha);
}

void LTexture::render(SDL_Renderer *renderer, int x, int y, SDL_Rect *clip, double angle, SDL_Point *center, SDL_RendererFlip flip)
{
	// Set rendering space and render to screen
	SDL_Rect renderQuad = {x, y, mWidth, mHeight};

	// Set clip rendering dimensions
	if (clip != NULL)
	{
		renderQuad.w = clip->w;
		renderQuad.h = clip->h;
	}

	// Render to screen
	SDL_RenderCopyEx(renderer, mTexture, clip, &renderQuad, angle, center, flip);
}

void LTexture::setAsRenderTarget(SDL_Renderer *renderer)
{
	// Make self render target
	SDL_SetRenderTarget(renderer, mTexture);
}

int LTexture::getWidth()
{
	return mWidth;
}

int LTexture::getHeight()
{
	return mHeight;
}