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140 lines
3.9 KiB
140 lines
3.9 KiB
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#include <jni.h>
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#include <errno.h>
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#include "osmroute.h"
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#include "system.h"
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#include <ft2build.h>
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#include FT_FREETYPE_H
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struct point {
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GLfloat x;
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GLfloat y;
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GLfloat s;
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GLfloat t;
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};
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int ft_init = 0;
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FT_Library ft;
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int font_init () {
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/* Initialize the FreeType2 library */
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if (FT_Init_FreeType(&ft)) {
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d_printf ("Could not init freetype library\n");
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return 0;
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}
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d_printf ("font init");
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return 1;
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};
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struct font* font_load(char *fname) {
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AAssetManager *mgr = engine.app->activity->assetManager;
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AAsset* asset = NULL;
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struct font *f = NULL;
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int bytesread, fontsize;
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d_printf ("font load:%s", fname);
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if ((asset = AAssetManager_open(mgr, fname, AASSET_MODE_UNKNOWN)) == 0) {
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LOGW("Asset \"%s\" not found.", fname);
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return NULL;
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}
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/* load font file into memory */
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f = (struct font *) ml_malloc (sizeof (struct font));
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f->buffersize = AAsset_getLength(asset);
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f->buffer = (char *) ml_malloc (f->buffersize);
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bytesread = AAsset_read(asset, f->buffer, f->buffersize);
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AAsset_close(asset);
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/* Load a font from memory */
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if (FT_New_Memory_Face(ft, f->buffer, f->buffersize, 0, &f->face)) {
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d_printf("Could not read file from memory.\n");
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exit (1);;
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}
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FT_Set_Pixel_Sizes(f->face, 0, 16);
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d_printf ("font loaded (size:%d).", f->buffersize);
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return f;
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}
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/**
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* Render text using the currently loaded font and currently set font size.
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* Rendering starts at coordinates (x, y), z is always 0.
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* The pixel coordinates that the FreeType2 library uses are scaled by (sx, sy).
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*/
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void font_draw (struct font *f, char *text, float x, float y, float sx, float sy) {
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char *p;
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int i;
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GLfloat vp[12] = { 0.0, 0.0, 0.0,
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0.0, 0.0, 0.0,
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0.0, 0.0, 0.0,
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0.0, 0.0, 0.0 };
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GLfloat vt[8] = {0, 1,
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1, 1,
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1, 0,
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0, 0};
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FT_GlyphSlot g = f->face->glyph;
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/* Create a texture that will be used to hold one "glyph" */
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GLuint tex;
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glGenTextures (1, &tex);
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glEnable (GL_TEXTURE_2D);
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glActiveTexture (GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, tex);
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glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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/* We require 1 byte alignment when uploading texture data */
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glUniform1i (engine.gles_txenabled, 2);
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glUniform1i(engine.gles_txsampler, 0);
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/* Loop through all characters */
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for (p = text; *p; p++) {
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/* Try to load and render the character */
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if ((i = FT_Load_Char(f->face, *p, FT_LOAD_RENDER))) {
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d_printf ("error:%d", i);
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continue;
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}
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/* Upload the "bitmap", which contains an 8-bit grayscale image, as an alpha texture */
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glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, g->bitmap.width, g->bitmap.rows, 0, GL_ALPHA, GL_UNSIGNED_BYTE, g->bitmap.buffer);
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/* Calculate the vertex and texture coordinates */
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// d_printf ("x: %f advance:%d %d", x, g->advance.x, g->advance.x >> 6);
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vp[0] = x; vp[1] = y + g->bitmap.rows - g->bitmap_top;
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vp[3] = x + g->bitmap.width; vp[4] = y + g->bitmap.rows - g->bitmap_top;
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vp[6] = x + g->bitmap.width; vp[7] = y - g->bitmap.rows + g->bitmap.rows - g->bitmap_top;
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vp[9] = x; vp[10] = y - g->bitmap.rows + g->bitmap.rows - g->bitmap_top;
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glVertexAttribPointer (engine.gles_pos, 3, GL_FLOAT, GL_FALSE, 0, vp);
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glVertexAttribPointer (engine.gles_txcoord, 2, GL_FLOAT, GL_FALSE, 0, vt);
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glDrawArrays(GL_TRIANGLE_FAN,0,4);
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// glVertexAttribPointer (engine.gles_pos, 3, GL_FLOAT, GL_FALSE, 0, vp);
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// glDrawArrays(GL_LINES,0,2);
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/* Advance the cursor to the start of the next character */
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// x += (g->advance.x >> 6);
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// y -= (g->advance.y >> 6);
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if (g->bitmap.width == 0) x += 2.0;
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else x += g->bitmap.width + 1;
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}
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glBindTexture (GL_TEXTURE_2D, 0);
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glDeleteTextures (1, &tex);
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glUniform1i (engine.gles_txenabled, 0);
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glDisable (GL_TEXTURE_2D);
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};
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