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Add conversion from argb1555 to argb4444

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This commit is contained in:
Bkacjios 2024-04-27 09:53:03 -04:00
parent c4e219199a
commit 0facbd16b2
1 changed files with 21 additions and 0 deletions
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21
GL/texture.c
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@ -1148,6 +1148,26 @@ GL_FORCE_INLINE void _rgba4444_to_argb4444(const GLubyte* source, GLubyte* dest)
*((GLushort*) dest) = ((*src & 0x000F) << 12) | *src >> 4;
}
GL_FORCE_INLINE void _argb1555_to_argb4444(const GLubyte* source, GLubyte* dest) {
GLushort src = *((GLushort*) source);
uint8_t a = (src >> 15) & 0x01;
uint8_t r = (src >> 10) & 0x1F;
uint8_t g = (src >> 5) & 0x1F;
uint8_t b = src & 0x1F;
// Alpha is either 0 or 15
a = (a << 4) - a;
// Bitwise magic to scale from 5 to 4 bits.
// Shift left by 4 to multiply by 16, shift right by 5 to divide by 32.
r = (r << 4) >> 5;
g = (g << 4) >> 5;
b = (b << 4) >> 5;
*((GLushort*) dest) = (a << 12) | (r << 8) | (g << 4) | b;
}
GL_FORCE_INLINE void _rgba4444_to_rgba8888(const GLubyte* source, GLubyte* dest) {
GLushort src = *((GLushort*) source);
GLubyte* dst = (GLubyte*) dest;
@ -1216,6 +1236,7 @@ static int _determineConversion(GLint internalFormat, GLenum format, GLenum type
{NULL, GL_ARGB4444_TWID_KOS, GL_BGRA, GL_UNSIGNED_SHORT_4_4_4_4_REV_TWID_KOS, false, false},
{_rgba8888_to_argb4444, GL_ARGB4444_TWID_KOS, GL_RGBA, GL_UNSIGNED_BYTE, true, false},
{NULL, GL_ARGB1555_KOS, GL_BGRA, GL_UNSIGNED_SHORT_1_5_5_5_REV, false, false},
{_argb1555_to_argb4444, GL_ARGB4444_TWID_KOS, GL_RGBA, GL_UNSIGNED_SHORT_1_5_5_5_REV, true, false},
{NULL, GL_ARGB1555_TWID_KOS, GL_BGRA, GL_UNSIGNED_SHORT_1_5_5_5_REV_TWID_KOS, false, false},
{_rgba8888_to_rgb565, GL_RGB565_KOS, GL_RGBA, GL_UNSIGNED_BYTE, false, false},
{_r8_to_rgb565, GL_RGB565_KOS, GL_RED, GL_UNSIGNED_BYTE, false, false},