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#include <dtx.h>
#include <rez/file.h>
#include <GL/gl.h>
#include <GL/glext.h>
#include <cstdint>
#include <cstdio>
#include <iostream>
int dtx::draw() const
{
int ret = 0;
GLenum error;
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texture);
if (bpp == bpp_s3tc_dxt5)
{
glEnable(GL_BLEND);
glBlendFunc(GL_ONE_MINUS_SRC_ALPHA, GL_SRC_ALPHA);
}
glBegin(GL_QUADS);
glTexCoord2f(0.0f, 0.0f); glVertex2f(-0.5f, 0.5f);
glTexCoord2f(0.0f, 1.0f); glVertex2f(0.5f, 0.5f);
glTexCoord2f(1.0f, 1.0f); glVertex2f(0.5f, -0.5f);
glTexCoord2f(1.0f, 0.0f); glVertex2f(-0.5f, -0.5f);
glEnd();
glFlush();
glDisable(GL_BLEND);
glDisable(GL_TEXTURE_2D);
while ((error = glGetError()) != GL_NO_ERROR)
{
ret = -1;
fprintf(stderr, "%s:%d: glGetError returned %x\n", __FILE__,
__LINE__, error);
}
return ret;
}
int dtx::parse(rez::file &f)
{
uint32_t restype, uversion;
if (f.read_le(restype) || f.read_le(uversion))
return -1;
const uint32_t exp_type = 0;
const int32_t exp_version = -5;
int32_t version = uversion;
if (restype != exp_type)
{
std::cerr << f.path() << ": invalid resource type " << restype
<< ", expected " << exp_type << '\n';
return -1;
}
else if (version != exp_version)
{
std::cerr << f.path() << ": invalid or unsupported version " << version
<< ", expected " << exp_version << '\n';
return -1;
}
const uint16_t max_mipmaps = 8;
uint16_t w, h, n_mipmaps, n_sections, tex_angle;
uint32_t iflags, userflags, tex_scale;
unsigned char tex_group, n_rtmipmaps, bpp, mipmap_off_nc, mipmap_off,
tex_prio;
char cmd[128];
if (f.read_le(w)
|| f.read_le(h)
|| f.read_le(n_mipmaps)
|| f.read_le(n_sections))
{
std::cerr << f.path() << ": failed to read header\n";
return -1;
}
else if (!n_mipmaps || n_mipmaps > max_mipmaps)
{
std::cerr << f.path() << ": invalid number of mipmaps: "
<< n_mipmaps << '\n';
return -1;
}
else if (f.read_le(iflags) || f.read_le(userflags))
{
std::cerr << f.path() << ": failed to read flags\n";
return -1;
}
else if (f.read(tex_group)
|| f.read(n_rtmipmaps)
|| f.read(bpp)
|| f.read(mipmap_off_nc)
|| f.read(mipmap_off)
|| f.read(tex_prio)
|| f.read_le(tex_scale)
|| f.read_le(tex_angle))
{
std::cerr << f.path() << ": failed to read extra data\n";
return -1;
}
else if (bpp != bpp::bpp_32
&& bpp != bpp::bpp_s3tc_dxt1
&& bpp != bpp::bpp_s3tc_dxt5)
{
std::cerr << f.path() << ": invalid or unsupported bpp "
<< std::to_string(bpp) << ", expected " << bpp::bpp_s3tc_dxt1
<< ", " << bpp::bpp_32 << " or " << bpp::bpp_s3tc_dxt5 << '\n';
return -1;
}
else if (f.read(cmd, sizeof cmd))
{
std::cerr << f.path() << ": failed to read cmd\n";
return -1;
}
this->bpp = static_cast<enum bpp>(bpp);
this->w = w;
this->h = h;
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
GLint level = 0;
for (uint32_t i = 0; i < n_mipmaps; i++)
{
GLenum format;
unsigned long n_pix = (w >> i) * (h >> i);
pixdata mipmap;
switch (this->bpp)
{
case bpp_32:
format = GL_BGRA;
n_pix *= sizeof (uint32_t);
break;
case bpp_s3tc_dxt1:
format = GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
n_pix >>= 1;
break;
case bpp_s3tc_dxt5:
format = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
break;
default:
return -1;
}
mipmap.reserve(n_pix);
while (n_pix)
{
unsigned char buf[BUFSIZ];
size_t n = n_pix > sizeof buf ? sizeof buf : n_pix;
if (f.read(buf, n))
return -1;
mipmap.insert(mipmap.end(), buf, &buf[n]);
n_pix -= n;
}
GLenum error;
int ret = 0;
if (bpp == bpp::bpp_s3tc_dxt1 || bpp == bpp::bpp_s3tc_dxt5)
glCompressedTexImage2D(GL_TEXTURE_2D, level++, format,
w >> i, h >> i, 0, mipmap.size(), mipmap.data());
else if (bpp == bpp::bpp_32)
glTexImage2D(GL_TEXTURE_2D, level++, format, w >> i, h >> i, 0,
format, GL_UNSIGNED_BYTE, mipmap.data());
while ((error = glGetError()) != GL_NO_ERROR)
{
fprintf(stderr, "%s:%d: glGetError returned %x\n", __FILE__,
__LINE__, error);
ret = -1;
}
if (ret)
return ret;
}
return 0;
}
dtx::~dtx()
{
if (texture)
glDeleteTextures(1, &texture);
}
dtx::dtx() :
texture(0)
{
}
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