void SDLColourFilter::Fill(const GraphicsObject& go,
const RGBAColour& colour) {
if (GLEW_ARB_fragment_shader && GLEW_ARB_multitexture) {
if (back_texture_id_ == 0) {
glGenTextures(1, &back_texture_id_);
glBindTexture(GL_TEXTURE_2D, back_texture_id_);
DebugShowGLErrors();
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
texture_width_ = SafeSize(screen_rect_.width());
texture_height_ = SafeSize(screen_rect_.height());
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
texture_width_, texture_height_,
0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
DebugShowGLErrors();
}
// Copy the current value of the region where we're going to render
// to a texture for input to the shader
glBindTexture(GL_TEXTURE_2D, back_texture_id_);
int ystart = int(Texture::ScreenHeight() - screen_rect_.y() -
screen_rect_.height());
int idx1 = screen_rect_.x();
glCopyTexSubImage2D(GL_TEXTURE_2D,
0,
0, 0,
idx1, ystart, texture_width_, texture_height_);
DebugShowGLErrors();
// Set up shader
glUseProgramObjectARB(Shaders::getObjectProgram());
glUniform1iARB(Shaders::getObjectUniformImage(), 0);
// The alpha is 255 because we are replacing the image on the screen
// instead of blending with it.
glUniform1fARB(Shaders::getObjectUniformAlpha(), 1.0f);
Shaders::loadObjectUniformFromGraphicsObject(go);
float thisx1 = 0;
float thisy1 = 0;
float thisx2 = float(screen_rect_.width()) / texture_width_;
float thisy2 = float(screen_rect_.height()) / texture_height_;
// Don't blend with the background. Blit on top of it.
glDisable(GL_BLEND);
glBegin(GL_QUADS);
{
glTexCoord2f(thisx1, thisy2);
glVertex2f(screen_rect_.x(), screen_rect_.y());
glTexCoord2f(thisx1, thisy1);
glVertex2f(screen_rect_.x(), screen_rect_.y() + screen_rect_.height());
glTexCoord2f(thisx2, thisy1);
glVertex2f(screen_rect_.x() + screen_rect_.width(),
screen_rect_.y() + screen_rect_.height());
glTexCoord2f(thisx2, thisy2);
glVertex2f(screen_rect_.x() + screen_rect_.width(), screen_rect_.y());
}
glEnd();
glEnable(GL_BLEND);
glUseProgramObjectARB(0);
}
}
int APIENTRY pngLoadF(FILE *fp, int mipmap, int trans, pngInfo *pinfo) {
GLint pack, unpack;
unsigned char header[8];
png_structp png;
png_infop info;
png_infop endinfo;
png_bytep data, data2;
png_bytep *row_p;
double fileGamma;
png_uint_32 width, height, rw, rh;
int depth, color;
png_uint_32 i;
fread(header, 1, 8, fp);
if (!png_check_sig(header, 8)) return 0;
png = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
info = png_create_info_struct(png);
endinfo = png_create_info_struct(png);
// DH: added following lines
if (setjmp(png->jmpbuf))
{
png_destroy_read_struct(&png, &info, &endinfo);
return 0;
}
// ~DH
png_init_io(png, fp);
png_set_sig_bytes(png, 8);
png_read_info(png, info);
png_get_IHDR(png, info, &width, &height, &depth, &color, NULL, NULL, NULL);
if (pinfo != NULL) {
pinfo->Width = width;
pinfo->Height = height;
pinfo->Depth = depth;
}
if (MaxTextureSize == 0)
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &MaxTextureSize);
#ifdef SUPPORTS_PALETTE_EXT
#ifdef _WIN32
if (PalettedTextures == -1)
PalettedTextures = ExtSupported("GL_EXT_paletted_texture") && (strstr((const char *) glGetString(GL_VERSION), "1.1.0 3Dfx Beta") == NULL);
if (PalettedTextures) {
if (glColorTableEXT == NULL) {
glColorTableEXT = (PFNGLCOLORTABLEEXTPROC) wglGetProcAddress("glColorTableEXT");
if (glColorTableEXT == NULL)
PalettedTextures = 0;
}
}
#endif
#endif
if (PalettedTextures == -1)
PalettedTextures = 0;
if (color == PNG_COLOR_TYPE_GRAY || color == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png);
if (color&PNG_COLOR_MASK_ALPHA && trans != PNG_ALPHA) {
png_set_strip_alpha(png);
color &= ~PNG_COLOR_MASK_ALPHA;
}
if (!(PalettedTextures && mipmap >= 0 && trans == PNG_SOLID))
if (color == PNG_COLOR_TYPE_PALETTE)
png_set_expand(png);
/*--GAMMA--*/
checkForGammaEnv();
if (png_get_gAMA(png, info, &fileGamma))
png_set_gamma(png, screenGamma, fileGamma);
else
png_set_gamma(png, screenGamma, 1.0/2.2);
png_read_update_info(png, info);
data = (png_bytep) malloc(png_get_rowbytes(png, info)*height);
row_p = (png_bytep *) malloc(sizeof(png_bytep)*height);
for (i = 0; i < height; i++) {
if (StandardOrientation)
row_p[height - 1 - i] = &data[png_get_rowbytes(png, info)*i];
else
row_p[i] = &data[png_get_rowbytes(png, info)*i];
}
png_read_image(png, row_p);
free(row_p);
rw = SafeSize(width), rh = SafeSize(height);
if (rw != width || rh != height) {
const int channels = png_get_rowbytes(png, info)/width;
data2 = (png_bytep) malloc(rw*rh*channels);
/* Doesn't work on certain sizes */
/* if (gluScaleImage(glformat, width, height, GL_UNSIGNED_BYTE, data, rw, rh, GL_UNSIGNED_BYTE, data2) != 0)
return 0;
*/
Resize(channels, data, width, height, data2, rw, rh);
width = rw, height = rh;
free(data);
data = data2;
}
{ /* OpenGL stuff */
glGetIntegerv(GL_PACK_ALIGNMENT, &pack);
glGetIntegerv(GL_UNPACK_ALIGNMENT, &unpack);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
#ifdef SUPPORTS_PALETTE_EXT
if (PalettedTextures && mipmap >= 0 && trans == PNG_SOLID && color == PNG_COLOR_TYPE_PALETTE) {
png_colorp pal;
int cols;
GLint intf;
if (pinfo != NULL) pinfo->Alpha = 0;
png_get_PLTE(png, info, &pal, &cols);
switch (cols) {
case 1<<1: intf = GL_COLOR_INDEX1_EXT; break;
case 1<<2: intf = GL_COLOR_INDEX2_EXT; break;
case 1<<4: intf = GL_COLOR_INDEX4_EXT; break;
case 1<<8: intf = GL_COLOR_INDEX8_EXT; break;
case 1<<12: intf = GL_COLOR_INDEX12_EXT; break;
case 1<<16: intf = GL_COLOR_INDEX16_EXT; break;
default:
/*printf("Warning: Colour depth %i not recognised\n", cols);*/
return 0;
}
glColorTableEXT(GL_TEXTURE_2D, GL_RGB8, cols, GL_RGB, GL_UNSIGNED_BYTE, pal);
glTexImage2D(GL_TEXTURE_2D, mipmap, intf, width, height, 0, GL_COLOR_INDEX, GL_UNSIGNED_BYTE, data);
}
else
#endif
if (trans == PNG_SOLID || trans == PNG_ALPHA || color == PNG_COLOR_TYPE_RGB_ALPHA || color == PNG_COLOR_TYPE_GRAY_ALPHA) {
GLenum glformat;
GLint glcomponent;
switch (color) {
case PNG_COLOR_TYPE_GRAY:
case PNG_COLOR_TYPE_RGB:
case PNG_COLOR_TYPE_PALETTE:
glformat = GL_RGB;
glcomponent = 3;
if (pinfo != NULL) pinfo->Alpha = 0;
break;
case PNG_COLOR_TYPE_GRAY_ALPHA:
case PNG_COLOR_TYPE_RGB_ALPHA:
glformat = GL_RGBA;
glcomponent = 4;
if (pinfo != NULL) pinfo->Alpha = 8;
break;
default:
/*puts("glformat not set");*/
return 0;
}
if (mipmap == PNG_BUILDMIPMAPS)
Build2DMipmaps(glcomponent, width, height, glformat, data, 1);
else if (mipmap == PNG_SIMPLEMIPMAPS)
Build2DMipmaps(glcomponent, width, height, glformat, data, 0);
else
glTexImage2D(GL_TEXTURE_2D, mipmap, glcomponent, width, height, 0, glformat, GL_UNSIGNED_BYTE, data);
}
else {
png_bytep p, endp, q;
int r, g, b, a;
p = data, endp = p+width*height*3;
q = data2 = (png_bytep) malloc(sizeof(png_byte)*width*height*4);
if (pinfo != NULL) pinfo->Alpha = 8;
#define FORSTART \
do { \
r = *p++; /*red */ \
g = *p++; /*green*/ \
b = *p++; /*blue */ \
*q++ = r; \
*q++ = g; \
*q++ = b;
#define FOREND \
q++; \
} while (p != endp);
#define ALPHA *q
switch (trans) {
case PNG_CALLBACK:
FORSTART
ALPHA = AlphaCallback((unsigned char) r, (unsigned char) g, (unsigned char) b);
FOREND
break;
case PNG_STENCIL:
FORSTART
if (r == StencilRed && g == StencilGreen && b == StencilBlue)
ALPHA = 0;
else
ALPHA = 255;
FOREND
break;
case PNG_BLEND1:
FORSTART
a = r+g+b;
if (a > 255) ALPHA = 255; else ALPHA = a;
FOREND
break;
case PNG_BLEND2:
FORSTART
a = r+g+b;
if (a > 255*2) ALPHA = 255; else ALPHA = a/2;
FOREND
break;
case PNG_BLEND3:
FORSTART
ALPHA = (r+g+b)/3;
FOREND
break;
case PNG_BLEND4:
FORSTART
a = r*r+g*g+b*b;
if (a > 255) ALPHA = 255; else ALPHA = a;
FOREND
break;
case PNG_BLEND5:
FORSTART
a = r*r+g*g+b*b;
if (a > 255*2) ALPHA = 255; else ALPHA = a/2;
FOREND
break;
case PNG_BLEND6:
FORSTART
a = r*r+g*g+b*b;
if (a > 255*3) ALPHA = 255; else ALPHA = a/3;
FOREND
break;
case PNG_BLEND7:
FORSTART
a = r*r+g*g+b*b;
if (a > 255*255) ALPHA = 255; else ALPHA = (int) sqrt(a);
FOREND
break;
}
#undef FORSTART
#undef FOREND
#undef ALPHA
if (mipmap == PNG_BUILDMIPMAPS)
Build2DMipmaps(4, width, height, GL_RGBA, data2, 1);
else if (mipmap == PNG_SIMPLEMIPMAPS)
Build2DMipmaps(4, width, height, GL_RGBA, data2, 0);
else
glTexImage2D(GL_TEXTURE_2D, mipmap, 4, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data2);
free(data2);
}
glPixelStorei(GL_PACK_ALIGNMENT, pack);
glPixelStorei(GL_UNPACK_ALIGNMENT, unpack);
} /* OpenGL end */
png_read_end(png, endinfo);
png_destroy_read_struct(&png, &info, &endinfo);
free(data);
return 1;
}
