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Added function: ImageMipmaps()

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Ray 2018-01-18 00:23:28 +01:00
parent bdb61306ac
commit ce9f191f1b
2 changed files with 76 additions and 0 deletions
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1
src/raylib.h
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@ -886,6 +886,7 @@ RLAPI void ImageAlphaPremultiply(Image *image);
RLAPI void ImageCrop(Image *image, Rectangle crop); // Crop an image to a defined rectangle
RLAPI void ImageResize(Image *image, int newWidth, int newHeight); // Resize and image (bilinear filtering)
RLAPI void ImageResizeNN(Image *image,int newWidth,int newHeight); // Resize and image (Nearest-Neighbor scaling algorithm)
RLAPI void ImageMipmaps(Image *image); // Generate all mipmap levels for a provided image
RLAPI void ImageDither(Image *image, int rBpp, int gBpp, int bBpp, int aBpp); // Dither image data to 16bpp or lower (Floyd-Steinberg dithering)
RLAPI Image ImageText(const char *text, int fontSize, Color color); // Create an image from text (default font)
RLAPI Image ImageTextEx(SpriteFont font, const char *text, float fontSize, int spacing, Color tint); // Create an image from text (custom sprite font)

75
src/textures.c
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@ -1071,6 +1071,81 @@ void ImageResizeNN(Image *image,int newWidth,int newHeight)
free(pixels);
}
// Generate all mipmap levels for a provided image
// NOTE 1: Supports POT and NPOT images
// NOTE 2: image.data is scaled to include mipmap levels
// NOTE 3: Mipmaps format is the same as base image
void ImageMipmaps(Image *image)
{
int mipCount = 1; // Required mipmap levels count (including base level)
int mipWidth = image->width; // Base image width
int mipHeight = image->height; // Base image height
int mipSize = GetPixelDataSize(mipWidth, mipHeight, image->format); // Image data size (in bytes)
// Count mipmap levels required
while ((mipWidth != 1) || (mipHeight != 1))
{
if (mipWidth != 1) mipWidth /= 2;
if (mipHeight != 1) mipHeight /= 2;
// Security check for NPOT textures
if (mipWidth < 1) mipWidth = 1;
if (mipHeight < 1) mipHeight = 1;
TraceLog(LOG_DEBUG, "Next mipmap level: %i x %i - current size %i", mipWidth, mipHeight, mipSize);
mipCount++;
mipSize += GetPixelDataSize(mipWidth, mipHeight, image->format); // Add mipmap size (in bytes)
}
TraceLog(LOG_DEBUG, "Total mipmaps required: %i", mipCount);
TraceLog(LOG_DEBUG, "Total size of data required: %i", mipSize);
TraceLog(LOG_DEBUG, "Image data original memory point: %i", image->data);
if (image->mipmaps < mipCount)
{
void *temp = realloc(image->data, mipSize);
if (temp != NULL)
{
image->data = temp; // Assign new pointer (new size) to store mipmaps data
TraceLog(LOG_DEBUG, "Image data memory point reallocated: %i", temp);
}
else TraceLog(LOG_WARNING, "Mipmaps required memory could not be allocated");
// Pointer to allocated memory point where store next mipmap level data
unsigned char *nextmip = image->data + GetPixelDataSize(image->width, image->height, image->format);
mipWidth = image->width/2;
mipHeight = image->height/2;
mipSize = GetPixelDataSize(mipWidth, mipHeight, image->format);
Image imCopy = ImageCopy(*image);
for (int i = 1; i < mipCount; i++)
{
TraceLog(LOG_DEBUG, "Next mipmap level %i (%i x %i) - size %i - mem pos: %i", i, mipWidth, mipHeight, mipSize, nextmip);
ImageResize(&imCopy, mipWidth, mipHeight); // Uses internally Mitchell cubic downscale filter
memcpy(nextmip, imCopy.data, mipSize);
nextmip += mipSize;
image->mipmaps++;
mipWidth /= 2;
mipHeight /= 2;
// Security check for NPOT textures
if (mipWidth < 1) mipWidth = 1;
if (mipHeight < 1) mipHeight = 1;
mipSize = GetPixelDataSize(mipWidth, mipHeight, image->format);
}
UnloadImage(imCopy);
}
else TraceLog(LOG_WARNING, "Image mipmaps already available");
}
// Dither image data to 16bpp or lower (Floyd-Steinberg dithering)
// NOTE: In case selected bpp do not represent an known 16bit format,
// dithered data is stored in the LSB part of the unsigned short