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#include "GLESTextureUtils.h"
#include "glUtils.h"
#include <cutils/log.h>
namespace GLESTextureUtils {
// Based on computations in
// https://swiftshader.googlesource.com/SwiftShader/+/master/src/OpenGL/common/Image.cpp
// such as Image::loadImageData,
// ComputePitch/ComputePackingOffset
#define HIGHEST_MULTIPLE_OF(align, x) \
(( ( x ) + ( align ) - 1) & ~( ( align ) - 1)) \
static int computePixelSize(GLenum format, GLenum type) {
#define FORMAT_ERROR(format, type) \
ALOGE("%s:%d unknown format/type 0x%x 0x%x", __FUNCTION__, __LINE__, format, type) \
switch(type) {
case GL_BYTE:
switch(format) {
case GL_R8:
case GL_R8I:
case GL_R8_SNORM:
case GL_RED: return sizeof(char);
case GL_RED_INTEGER: return sizeof(char);
case GL_RG8:
case GL_RG8I:
case GL_RG8_SNORM:
case GL_RG: return sizeof(char) * 2;
case GL_RG_INTEGER: return sizeof(char) * 2;
case GL_RGB8:
case GL_RGB8I:
case GL_RGB8_SNORM:
case GL_RGB: return sizeof(char) * 3;
case GL_RGB_INTEGER: return sizeof(char) * 3;
case GL_RGBA8:
case GL_RGBA8I:
case GL_RGBA8_SNORM:
case GL_RGBA: return sizeof(char) * 4;
case GL_RGBA_INTEGER: return sizeof(char) * 4;
default: FORMAT_ERROR(format, type);
}
break;
case GL_UNSIGNED_BYTE:
switch(format) {
case GL_R8:
case GL_R8UI:
case GL_RED: return sizeof(unsigned char);
case GL_RED_INTEGER: return sizeof(unsigned char);
case GL_ALPHA8_EXT:
case GL_ALPHA: return sizeof(unsigned char);
case GL_LUMINANCE8_EXT:
case GL_LUMINANCE: return sizeof(unsigned char);
case GL_LUMINANCE8_ALPHA8_EXT:
case GL_LUMINANCE_ALPHA: return sizeof(unsigned char) * 2;
case GL_RG8:
case GL_RG8UI:
case GL_RG: return sizeof(unsigned char) * 2;
case GL_RG_INTEGER: return sizeof(unsigned char) * 2;
case GL_RGB8:
case GL_RGB8UI:
case GL_SRGB8:
case GL_RGB: return sizeof(unsigned char) * 3;
case GL_RGB_INTEGER: return sizeof(unsigned char) * 3;
case GL_RGBA8:
case GL_RGBA8UI:
case GL_SRGB8_ALPHA8:
case GL_RGBA: return sizeof(unsigned char) * 4;
case GL_RGBA_INTEGER: return sizeof(unsigned char) * 4;
case GL_BGRA_EXT:
case GL_BGRA8_EXT: return sizeof(unsigned char)* 4;
default: FORMAT_ERROR(format, type);
}
break;
case GL_SHORT:
switch(format) {
case GL_R16I:
case GL_RED_INTEGER: return sizeof(short);
case GL_RG16I:
case GL_RG_INTEGER: return sizeof(short) * 2;
case GL_RGB16I:
case GL_RGB_INTEGER: return sizeof(short) * 3;
case GL_RGBA16I:
case GL_RGBA_INTEGER: return sizeof(short) * 4;
default: FORMAT_ERROR(format, type);
}
break;
case GL_UNSIGNED_SHORT:
switch(format) {
case GL_DEPTH_COMPONENT16:
case GL_DEPTH_COMPONENT: return sizeof(unsigned short);
case GL_R16UI:
case GL_RED_INTEGER: return sizeof(unsigned short);
case GL_RG16UI:
case GL_RG_INTEGER: return sizeof(unsigned short) * 2;
case GL_RGB16UI:
case GL_RGB_INTEGER: return sizeof(unsigned short) * 3;
case GL_RGBA16UI:
case GL_RGBA_INTEGER: return sizeof(unsigned short) * 4;
default: FORMAT_ERROR(format, type);
}
break;
case GL_INT:
switch(format) {
case GL_R32I:
case GL_RED_INTEGER: return sizeof(int);
case GL_RG32I:
case GL_RG_INTEGER: return sizeof(int) * 2;
case GL_RGB32I:
case GL_RGB_INTEGER: return sizeof(int) * 3;
case GL_RGBA32I:
case GL_RGBA_INTEGER: return sizeof(int) * 4;
default: FORMAT_ERROR(format, type);
}
break;
case GL_UNSIGNED_INT:
switch(format) {
case GL_DEPTH_COMPONENT16:
case GL_DEPTH_COMPONENT24:
case GL_DEPTH_COMPONENT32_OES:
case GL_DEPTH_COMPONENT: return sizeof(unsigned int);
case GL_R32UI:
case GL_RED_INTEGER: return sizeof(unsigned int);
case GL_RG32UI:
case GL_RG_INTEGER: return sizeof(unsigned int) * 2;
case GL_RGB32UI:
case GL_RGB_INTEGER: return sizeof(unsigned int) * 3;
case GL_RGBA32UI:
case GL_RGBA_INTEGER: return sizeof(unsigned int) * 4;
default: FORMAT_ERROR(format, type);
}
break;
case GL_UNSIGNED_SHORT_4_4_4_4:
case GL_UNSIGNED_SHORT_5_5_5_1:
case GL_UNSIGNED_SHORT_5_6_5:
case GL_UNSIGNED_SHORT_4_4_4_4_REV_EXT:
case GL_UNSIGNED_SHORT_1_5_5_5_REV_EXT:
return sizeof(unsigned short);
case GL_UNSIGNED_INT_10F_11F_11F_REV:
case GL_UNSIGNED_INT_5_9_9_9_REV:
case GL_UNSIGNED_INT_2_10_10_10_REV:
case GL_UNSIGNED_INT_24_8_OES:
return sizeof(unsigned int);
case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
return sizeof(float) + sizeof(unsigned int);
case GL_FLOAT:
switch(format) {
case GL_DEPTH_COMPONENT32F:
case GL_DEPTH_COMPONENT: return sizeof(float);
case GL_ALPHA32F_EXT:
case GL_ALPHA: return sizeof(float);
case GL_LUMINANCE32F_EXT:
case GL_LUMINANCE: return sizeof(float);
case GL_LUMINANCE_ALPHA32F_EXT:
case GL_LUMINANCE_ALPHA: return sizeof(float) * 2;
case GL_RED: return sizeof(float);
case GL_R32F: return sizeof(float);
case GL_RG: return sizeof(float) * 2;
case GL_RG32F: return sizeof(float) * 2;
case GL_RGB: return sizeof(float) * 3;
case GL_RGB32F: return sizeof(float) * 3;
case GL_RGBA: return sizeof(float) * 4;
case GL_RGBA32F: return sizeof(float) * 4;
default: FORMAT_ERROR(format, type);
}
break;
case GL_HALF_FLOAT:
case GL_HALF_FLOAT_OES:
switch(format) {
case GL_ALPHA16F_EXT:
case GL_ALPHA: return sizeof(unsigned short);
case GL_LUMINANCE16F_EXT:
case GL_LUMINANCE: return sizeof(unsigned short);
case GL_LUMINANCE_ALPHA16F_EXT:
case GL_LUMINANCE_ALPHA: return sizeof(unsigned short) * 2;
case GL_RED: return sizeof(unsigned short);
case GL_R16F: return sizeof(unsigned short);
case GL_RG: return sizeof(unsigned short) * 2;
case GL_RG16F: return sizeof(unsigned short) * 2;
case GL_RGB: return sizeof(unsigned short) * 3;
case GL_RGB16F: return sizeof(unsigned short) * 3;
case GL_RGBA: return sizeof(unsigned short) * 4;
case GL_RGBA16F: return sizeof(unsigned short) * 4;
default: FORMAT_ERROR(format, type);
}
break;
default: FORMAT_ERROR(format, type);
}
return 0;
}
static int computePitch(GLsizei inputWidth, GLenum format, GLenum type, int align) {
GLsizei unaligned_width = computePixelSize(format, type) * inputWidth;
return HIGHEST_MULTIPLE_OF(align, unaligned_width);
}
static int computePackingOffset(GLenum format, GLenum type, GLsizei width, GLsizei height, int align, int skipPixels, int skipRows, int skipImages) {
GLsizei alignedPitch = computePitch(width, format, type, align);
int packingOffsetRows =
(skipImages * height + skipRows);
return packingOffsetRows * alignedPitch + skipPixels * computePixelSize(format, type);
}
void computeTextureStartEnd(
GLsizei width, GLsizei height, GLsizei depth,
GLenum format, GLenum type,
int unpackAlignment,
int unpackRowLength,
int unpackImageHeight,
int unpackSkipPixels,
int unpackSkipRows,
int unpackSkipImages,
int* start,
int* end) {
GLsizei inputWidth = (unpackRowLength == 0) ? width : unpackRowLength;
GLsizei inputPitch = computePitch(inputWidth, format, type, unpackAlignment);
GLsizei inputHeight = (unpackImageHeight == 0) ? height : unpackImageHeight;
ALOGV("%s: input idim %d %d %d w p h %d %d %d:", __FUNCTION__, width, height, depth, inputWidth, inputPitch, inputHeight);
int startVal = computePackingOffset(format, type, inputWidth, inputHeight, unpackAlignment, unpackSkipPixels, unpackSkipRows, unpackSkipImages);
int endVal = startVal + inputPitch * inputHeight * depth;
if (start) *start = startVal;
if (end) *end = endVal;
ALOGV("%s: start/end: %d %d", __FUNCTION__, *start, *end);
}
int computeTotalImageSize(
GLsizei width, GLsizei height, GLsizei depth,
GLenum format, GLenum type,
int unpackAlignment,
int unpackRowLength,
int unpackImageHeight,
int unpackSkipPixels,
int unpackSkipRows,
int unpackSkipImages) {
int start, end;
computeTextureStartEnd(
width, height, depth,
format, type,
unpackAlignment,
unpackRowLength,
unpackImageHeight,
unpackSkipPixels,
unpackSkipRows,
unpackSkipImages,
&start,
&end);
return end;
}
int computeNeededBufferSize(
GLsizei width, GLsizei height, GLsizei depth,
GLenum format, GLenum type,
int unpackAlignment,
int unpackRowLength,
int unpackImageHeight,
int unpackSkipPixels,
int unpackSkipRows,
int unpackSkipImages) {
int start, end;
computeTextureStartEnd(
width, height, depth,
format, type,
unpackAlignment,
unpackRowLength,
unpackImageHeight,
unpackSkipPixels,
unpackSkipRows,
unpackSkipImages,
&start,
&end);
return end - start;
}
void computePackingOffsets2D(
GLsizei width, GLsizei height,
GLenum format, GLenum type,
int packAlignment,
int packRowLength,
int packSkipPixels,
int packSkipRows,
int* startOffset,
int* packingPixelRowSize,
int* packingTotalRowSize) {
int widthTotal = (packRowLength == 0) ? width : packRowLength;
int totalRowSize = computePitch(widthTotal, format, type, packAlignment);
int pixelsOnlyRowSize = computePitch(width, format, type, packAlignment);
int packingOffsetStart =
computePackingOffset(
format, type, widthTotal, height, packAlignment, packSkipPixels, packSkipRows, 0 /* skip images = 0 */);
if (startOffset) *startOffset = packingOffsetStart;
if (packingPixelRowSize) *packingPixelRowSize = pixelsOnlyRowSize;
if (packingTotalRowSize) *packingTotalRowSize = totalRowSize;
}
} // namespace GLESTextureUtils
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