Hi,
I am using SDL_TTF, and when I render the SDL_Surface returned by TTF_RenderText_Solid(), I only get a solid quad. Here's my code:
static int txt_WriteText(SDL_Color p_Color,
float p_XCoord,
float p_YCoord,
const char *p_Text,
...)
{
SDL_Surface* _Surface;
int _TextureID;
char _Buffer[1024]; // 1KB Buffer
va_list _ArgList; // Pointer To List Of Arguments
if(p_Text == NULL) // If There's No Text
return(ERR_WRITE_TEXT); // Flag An Error
if(g_TTF == NULL) // If Global TTF Is NULL
return(ERR_WRITE_TEXT); // Flag An Error
va_start(_ArgList, p_Text); // Parses The String For Variables
vsprintf(_Buffer, p_Text, _ArgList); // And Converts Symbols To Actual String
va_end(_ArgList);
// Render Text To An SDL_Surface
if(!(_Surface = TTF_RenderText_Solid(g_TTF,_Buffer,p_Color))) {
return(ERR_WRITE_TEXT);
} else {
glEnable(GL_TEXTURE_2D); // Enable 2D Texture Support
glGenTextures(1, &_TextureID);
glBindTexture(GL_TEXTURE_2D, _TextureID);
glTexImage2D(GL_TEXTURE_2D, 0, 3, _Surface->w, _Surface->h, 0, GL_BGR, GL_UNSIGNED_BYTE, _Surface->pixels);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
txt_BeginOverlay(g_ScreenWidth, g_ScreenHeight);
glColor3ub(p_Color.r, p_Color.g, p_Color.b);
glBegin(GL_QUADS);
glTexCoord2f(1.0f, 0.0f); glVertex2f(p_XCoord, p_YCoord);
glTexCoord2f(1.0f, 1.0f); glVertex2f(p_XCoord, p_YCoord+_Surface->h);
glTexCoord2f(0.0f, 1.0f); glVertex2f(p_XCoord+_Surface->w, p_YCoord+_Surface->h);
glTexCoord2f(0.0f, 0.0f); glVertex2f(p_XCoord+_Surface->w, p_YCoord);
glEnd();
glColor3ub(255,255,255);
txt_EndOverlay();
}
SDL_FreeSurface(_Surface);
return(OK_WRITE_TEXT);
}
txtBeginOverlay() and txtEndOverlay() are just codes that set the screen into ortho mode. Here's the code:
void txt_BeginOverlay(int p_Width, // Width Of (Overlay) Window
int p_Height) // Height Of (Overlay) Window
{
glGetIntegerv(GL_BLEND_SRC, &txt_blend_src);
glGetIntegerv(GL_BLEND_DST, &txt_blend_dst);
glPushAttrib(GL_ENABLE_BIT|GL_VIEWPORT_BIT|GL_TRANSFORM_BIT);
glDisable(GL_DEPTH_TEST);
glDisable(GL_CULL_FACE);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_BLEND);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
gluOrtho2D(0.0f, p_Width, 0.0f, p_Height);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
}
void txt_EndOverlay(void)
{
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glPopAttrib();
glBlendFunc(txt_blend_src, txt_blend_dst);
glMatrixMode(GL_MODELVIEW);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
}
any idea what i'm doing wrong? I only get a solid colored quad (color of quad depends on the SDL_Color I pass to txt_WriteText())
this link: http://jcatki.no-ip.org/SDL_ttf/SDL_ttf_27.html#SEC27 says that TTF_RenderText_Solid():
quote:Create an 8-bit palettized surface and render the given text at fast quality with the given font and color. The 0 pixel value is the colorkey, giving a transparent background, and the 1 pixel value is set to the text color. The colormap is set to have the desired foreground color at index 1, this allows you to change the color without having to render the text again. Colormap index 0 is of course not drawn, since it is the colorkey, and thus transparent, though it's actual color is 255 minus each RGB component of the foreground.
Does it have something to do with the way i use glTexImage2D()? it says the surface is 8-bit, will i have to modify my glTexImage2D()? How do i fix it?
thanks!
[edited by - _nomad_ on April 26, 2004 6:36:45 AM]
(or am i mistaken? is there a flag that allows ARGB definition?)
