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Help with drawing text (sprites)

 
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sturatt



Joined: 13 Jul 2006
Posts: 46
PostPosted: Wed Jul 26, 2006 4:05 pm    Post subject: Help with drawing text (sprites) Reply with quote
This all started when i wanted to use a custom font. at first i tried to make a text drawer using graphic.h's blit alpha image to screen, but it was too slow. So i embarked on my journey to try and learn enough GU to be able to draw text on the screen.

the way im trying to do it is with a 256x256 png with all the ascii chars. I can load and find my way through that with no problem, but when it comes to the gu stuff im a bit lost. Here's what i have so far, but it doesnt seem to actually draw any text..

FontEngine.c
Code:
void InitFont()
{

    FontTexture *FTex;
    FTex = readFontPNGTexture("font2.png");
    readwidths();

   
    sceGuInit();
   sceGuStart(GU_DIRECT, list);
   sceGuDrawBuffer(GU_PSM_8888,(void*)0,BUF_WIDTH);
   sceGuDispBuffer(SCR_WIDTH,SCR_HEIGHT,(void*)0x88000,BUF_WIDTH);
   sceGuDepthBuffer((void*)0x110000,BUF_WIDTH);
   sceGuOffset(2048 - (SCR_WIDTH/2),2048 - (SCR_HEIGHT/2));
   sceGuViewport(2048,2048,SCR_WIDTH,SCR_HEIGHT);
   sceGuDepthRange(0xc350,0x2710);
   sceGuScissor(0,0,SCR_WIDTH,SCR_HEIGHT);
   sceGuEnable(GU_SCISSOR_TEST);
   sceGuDisable(GU_DEPTH_TEST);
   sceGuShadeModel(GU_SMOOTH);
   sceGuEnable(GU_BLEND);
   sceGuBlendFunc(GU_ADD, GU_SRC_ALPHA, GU_ONE_MINUS_SRC_ALPHA, 0, 0);
   sceGuEnable(GU_TEXTURE_2D);
   sceGuTexMode(GU_PSM_8888, 0, 0, 0);
   sceGuTexImage(0, 256, 256, 256, FTex->data);
   sceGuTexFunc(GU_TFX_MODULATE, GU_TCC_RGBA);
   sceGuTexEnvColor(0x0);
   sceGuTexOffset(0.0f, 0.0f);
   sceGuTexScale(1.0f / 256.0f, 1.0f / 128.0f);
   sceGuTexWrap(GU_REPEAT, GU_REPEAT);
   sceGuTexFilter(GU_NEAREST, GU_NEAREST);
   sceGuFinish();
   sceGuSync(0,0);
   sceGuDisplay(GU_TRUE);
   
}


Code:

void pTextScreen(int x, int y, char * text, unsigned int color)
{
    int length = strlen(text);
    Vertex *vertices = sceGuGetMemory(sizeof(Vertex) * 2 * length);

    sceGuStart(GU_DIRECT, list);

    for (i = 0; i < strlen(text); i += 2)
    {
        ascii_num = (int)text[i];
        Y_Pos_Tex = ((int)(ascii_num / 16)) * 16;
        X_Pos_Tex = (ascii_num % 16) * 16;

        vertices[i].u = (float)X_Pos_Tex;
        vertices[i].v = (float)Y_Pos_Tex;
        vertices[i].c = color;
        vertices[i].x = (float)x;
        vertices[i].y = (float)y;
        vertices[i].z = 0.0f;

        vertices[i + 1].u = (float)((X_Pos_Tex + 16) - (16 - fontwidths[ascii_num]));
        vertices[i + 1].v = (float)(Y_Pos_Tex + 16);
        vertices[i + 1].c = color;
        vertices[i + 1].x = (float)((x + 16) - (16 - fontwidths[ascii_num]));
        vertices[i + 1].y = (float)(y + 16);
        vertices[i + 1].z = 0.0f;
        x += fontwidths[ascii_num];
    }

    sceGuDrawArray(GU_SPRITES,
      GU_TEXTURE_32BITF | GU_COLOR_8888 | GU_VERTEX_32BITF | GU_TRANSFORM_2D,
      length * 2, 0, vertices
   );

    sceGuFinish();
    sceGuSync(0, 0);
}


Code:

FontTexture* readFontPNGTexture(char *pngfile)
{
    FontTexture* fonttexture;
    png_uint_32 width, height;
    int bit_depth, color_type, interlace_type, x, y;
    u32 *line;

    fonttexture = (FontTexture*) malloc(sizeof(FontTexture));

    FILE *fp = fopen(pngfile,"rb");
    if (!fp)
    {
        return NULL;
    }
    //fread (signature, 1, 8, fp);
    //if (png_sig_cmp(signature, 0, 8) != 0)
    //{
    //    fclose(fp);
    //    return NULL;
    //}

    png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
    if (!png_ptr)
    {
        fclose(fp);
        return NULL;
    }

    png_infop info_ptr = png_create_info_struct(png_ptr);
    if (!info_ptr)
    {
        png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
        fclose(fp);
        return NULL;
    }

    png_infop end_info = png_create_info_struct(png_ptr);
    if (!end_info)
    {
        png_destroy_read_struct(&png_ptr, &info_ptr,(png_infopp)NULL);
        fclose(fp);
        return NULL;
    }

    png_init_io(png_ptr, fp);
    png_set_sig_bytes(png_ptr, 0);

    png_read_info(png_ptr, info_ptr);

    png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, &interlace_type, NULL, NULL);

    if (color_type == PNG_COLOR_TYPE_PALETTE)
        png_set_palette_to_rgb(png_ptr);

    if (color_type == PNG_COLOR_TYPE_GRAY &&
        bit_depth < 8) png_set_gray_1_2_4_to_8(png_ptr);

    if (png_get_valid(png_ptr, info_ptr,
        PNG_INFO_tRNS)) png_set_tRNS_to_alpha(png_ptr);

    png_set_strip_16(png_ptr);
    png_set_packing(png_ptr);
    png_set_filler(png_ptr, 0xFF, PNG_FILLER_AFTER);

    if (color_type == PNG_COLOR_TYPE_GRAY ||
        color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
          png_set_gray_to_rgb(png_ptr);

    fonttexture->imageWidth = width;
   fonttexture->imageHeight = height;
   fonttexture->textureWidth = 512;
   fonttexture->textureHeight = 512;
   fonttexture->data = (u32*) memalign(16, fonttexture->textureWidth * fonttexture->textureHeight * sizeof(u32));
   if (!fonttexture->data) return NULL;

    line = (u32*) malloc(width * 4);

   for (y = 0; y < height; y++) {
      png_read_row(png_ptr, (u8*) line, png_bytep_NULL);
      for (x = 0; x < width; x++) {
         u32 color = line[x];
         fonttexture->data[x + y * fonttexture->textureWidth] =  color;
      }
   }

   free(line);
   png_read_end(png_ptr, info_ptr);
   png_destroy_read_struct(&png_ptr, &info_ptr, png_infopp_NULL);
   fclose(fp);
   return fonttexture;
}


and yes i realize that ^^ is almost exactly like the graphics.h loadImage but i wanted to go through with the libpng documentation and find out what it was actually doing.


FontEngine.h
Code:
#include "graphics.h"


void readwidths();
void pTextScreen(int x, int y, char * text, unsigned int color);
void blitAlphaImageScreen(int sx, int sy, int width, int height, Image* source, int dx, int dy);
void InitFont();
void writewidths();

typedef struct
{
   int textureWidth;
   int textureHeight;
   int imageWidth;
   int imageHeight;
   u32* data;
} FontTexture;

typedef struct {
      float u, v;
      unsigned int c;
      float x, y, z;
   } Vertex;

FontTexture* readFontPNGTexture(char *pngfile);


fontwidths[] is a 256 int array that has a width for each char.
and i know the readFontPNGTexture() function works because ive used it to load a png and call a function in graphics.h and it worked fine.



i realize this is a lot of nonsense to sort through to try and find someone else's error, but i really would appreciate any help. I'm really trying hard to learn this =\
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sturatt



Joined: 13 Jul 2006
Posts: 46
PostPosted: Thu Jul 27, 2006 5:14 am    Post subject: Reply with quote
maybe it has something to do with my sceGuTexMode(GU_PSM_8888, 0, 0, 0); and with my sceGuDrawArray call. i dont actually know if my texture is 32bits, would that stop it from drawing?

also, if i changed GU_VERTEX_32BITF in the sceGuDrawArray function to GU_VERTEX_16BIT could i just use my ints instead of typecasting them as floats?
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subbie



Joined: 05 May 2005
Posts: 122
PostPosted: Fri Jul 28, 2006 4:14 am    Post subject: Reply with quote
You try doing a cache flush on your verticie list before sending it off to the GU?
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