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Added gl_lerpimages.

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git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@849 fc73d0e0-1445-4013-8a0c-d673dee63da5
This commit is contained in:
Spoike 2005-01-28 04:28:07 +00:00
parent a952965761
commit 545c635ae4
1 changed files with 153 additions and 14 deletions
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167
engine/gl/gl_draw.c
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@ -55,6 +55,7 @@ static int filmtexture;
extern cvar_t gl_nobind;
extern cvar_t gl_max_size;
extern cvar_t gl_picmip;
extern cvar_t gl_lerpimages;
extern cvar_t gl_picmip2d;
extern cvar_t r_drawdisk;
extern cvar_t gl_compress;
@ -2162,6 +2163,144 @@ gltexture_t *GL_MatchTexture (char *identifier, int bits, int width, int height)
return NULL;
}
static void Image_Resample32LerpLine (const qbyte *in, qbyte *out, int inwidth, int outwidth)
{
int j, xi, oldx = 0, f, fstep, endx, lerp;
fstep = (int) (inwidth*65536.0f/outwidth);
endx = (inwidth-1);
for (j = 0,f = 0;j < outwidth;j++, f += fstep)
{
xi = f >> 16;
if (xi != oldx)
{
in += (xi - oldx) * 4;
oldx = xi;
}
if (xi < endx)
{
lerp = f & 0xFFFF;
*out++ = (qbyte) ((((in[4] - in[0]) * lerp) >> 16) + in[0]);
*out++ = (qbyte) ((((in[5] - in[1]) * lerp) >> 16) + in[1]);
*out++ = (qbyte) ((((in[6] - in[2]) * lerp) >> 16) + in[2]);
*out++ = (qbyte) ((((in[7] - in[3]) * lerp) >> 16) + in[3]);
}
else // last pixel of the line has no pixel to lerp to
{
*out++ = in[0];
*out++ = in[1];
*out++ = in[2];
*out++ = in[3];
}
}
}
//yes, this is lordhavok's code.
//superblur away!
#define LERPBYTE(i) r = row1[i];out[i] = (qbyte) ((((row2[i] - r) * lerp) >> 16) + r)
static void Image_Resample32Lerp(const void *indata, int inwidth, int inheight, void *outdata, int outwidth, int outheight)
{
int i, j, r, yi, oldy, f, fstep, lerp, endy = (inheight-1), inwidth4 = inwidth*4, outwidth4 = outwidth*4;
qbyte *out;
const qbyte *inrow;
qbyte *tmem, *row1, *row2;
tmem = row1 = BZ_Malloc(2*(outwidth*4));
row2 = row1 + (outwidth * 4);
out = outdata;
fstep = (int) (inheight*65536.0f/outheight);
inrow = indata;
oldy = 0;
Image_Resample32LerpLine (inrow, row1, inwidth, outwidth);
Image_Resample32LerpLine (inrow + inwidth4, row2, inwidth, outwidth);
for (i = 0, f = 0;i < outheight;i++,f += fstep)
{
yi = f >> 16;
if (yi < endy)
{
lerp = f & 0xFFFF;
if (yi != oldy)
{
inrow = (qbyte *)indata + inwidth4*yi;
if (yi == oldy+1)
memcpy(row1, row2, outwidth4);
else
Image_Resample32LerpLine (inrow, row1, inwidth, outwidth);
Image_Resample32LerpLine (inrow + inwidth4, row2, inwidth, outwidth);
oldy = yi;
}
j = outwidth - 4;
while(j >= 0)
{
LERPBYTE( 0);
LERPBYTE( 1);
LERPBYTE( 2);
LERPBYTE( 3);
LERPBYTE( 4);
LERPBYTE( 5);
LERPBYTE( 6);
LERPBYTE( 7);
LERPBYTE( 8);
LERPBYTE( 9);
LERPBYTE(10);
LERPBYTE(11);
LERPBYTE(12);
LERPBYTE(13);
LERPBYTE(14);
LERPBYTE(15);
out += 16;
row1 += 16;
row2 += 16;
j -= 4;
}
if (j & 2)
{
LERPBYTE( 0);
LERPBYTE( 1);
LERPBYTE( 2);
LERPBYTE( 3);
LERPBYTE( 4);
LERPBYTE( 5);
LERPBYTE( 6);
LERPBYTE( 7);
out += 8;
row1 += 8;
row2 += 8;
}
if (j & 1)
{
LERPBYTE( 0);
LERPBYTE( 1);
LERPBYTE( 2);
LERPBYTE( 3);
out += 4;
row1 += 4;
row2 += 4;
}
row1 -= outwidth4;
row2 -= outwidth4;
}
else
{
if (yi != oldy)
{
inrow = (qbyte *)indata + inwidth4*yi;
if (yi == oldy+1)
memcpy(row1, row2, outwidth4);
else
Image_Resample32LerpLine (inrow, row1, inwidth, outwidth);
oldy = yi;
}
memcpy(out, row1, outwidth4);
}
}
BZ_Free(tmem);
}
/*
================
GL_ResampleTexture
@ -2173,12 +2312,25 @@ void GL_ResampleTexture (unsigned *in, int inwidth, int inheight, unsigned *out,
unsigned *inrow;
unsigned frac, fracstep;
if (gl_lerpimages.value)
{
Image_Resample32Lerp(in, inwidth, inheight, out, outwidth, outheight);
return;
}
fracstep = inwidth*0x10000/outwidth;
for (i=0 ; i<outheight ; i++, out += outwidth)
{
inrow = in + inwidth*(i*inheight/outheight);
frac = fracstep >> 1;
for (j=0 ; j<outwidth ; j+=4)
j=outwidth-4;
while (j&3)
{
out[j] = inrow[frac>>16];
frac += fracstep;
j--;
}
for ( ; j>=0 ; j-=4)
{
out[j] = inrow[frac>>16];
frac += fracstep;
@ -2468,18 +2620,6 @@ void GL_Upload32 (char *name, unsigned *data, int width, int height, qboolean m
if (gl_config.arb_texture_compression && gl_compress.value && name&&mipmap)
samples = alpha ? GL_COMPRESSED_RGBA_ARB : GL_COMPRESSED_RGB_ARB;
#if 0
if (mipmap)
gluBuild2DMipmaps (GL_TEXTURE_2D, samples, width, height, GL_RGBA, GL_UNSIGNED_BYTE, trans);
else if (scaled_width == width && scaled_height == height)
glTexImage2D (GL_TEXTURE_2D, 0, samples, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, trans);
else
{
gluScaleImage (GL_RGBA, width, height, GL_UNSIGNED_BYTE, trans,
scaled_width, scaled_height, GL_UNSIGNED_BYTE, scaled);
glTexImage2D (GL_TEXTURE_2D, 0, samples, scaled_width, scaled_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, scaled);
}
#else
texels += scaled_width * scaled_height;
if (gl_config.sgis_generate_mipmap&&mipmap)
@ -2575,7 +2715,6 @@ texels += scaled_width * scaled_height;
done:
if (gl_config.sgis_generate_mipmap&&mipmap)
qglTexParameterf(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_FALSE);
#endif
if (mipmap)