335 lines
8.8 KiB
C
335 lines
8.8 KiB
C
#include "font.h"
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#include "render.h"
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#include <shader.h>
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <window.h>
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#include "log.h"
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#include "openglrender.h"
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#include "stb_truetype.h"
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#include "stb_rect_pack.h"
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#include "stb_image_write.h"
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static uint32_t VBO = 0;
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static uint32_t VAO = 0;
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struct sFont *font;
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static struct shader *shader;
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unsigned char *slurp_file(const char *filename) {
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FILE *f = fopen(filename, "rb");
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if (!f) return NULL;
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fseek(f, 0, SEEK_END);
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long fsize = ftell(f);
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fseek(f, 0, SEEK_SET);
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unsigned char *slurp = malloc(fsize);
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fclose(f);
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return slurp;
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}
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char *slurp_text(const char *filename) {
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FILE *f = fopen(filename, "r'");
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if (!f) return NULL;
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char *buf;
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long int fsize;
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fseek(f, 0, SEEK_END);
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fsize = ftell(f);
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buf = malloc(fsize+1);
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rewind(f);
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size_t r = fread(buf, sizeof(char), fsize, f);
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buf[r] = '\0';
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fclose(f);
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return buf;
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}
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int slurp_write(const char *txt, const char *filename)
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{
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FILE *f = fopen(filename, "w");
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if (!f) return 1;
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fputs(txt, f);
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fclose(f);
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return 0;
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}
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void font_init(struct shader *textshader) {
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shader = textshader;
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shader_use(shader);
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glGenBuffers(1, &VBO);
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glGenVertexArrays(1, &VAO);
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glBindVertexArray(VAO);
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glBindBuffer(GL_ARRAY_BUFFER, VBO);
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glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 0, NULL);
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glEnableVertexAttribArray(0);
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glBindVertexArray(0);
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// Default font
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//font = MakeFont("teenytinypixels.ttf", 30);
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font = MakeFont("LessPerfectDOSVGA.ttf", 16);
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}
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void font_frame(struct window *w) {
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shader_use(shader);
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}
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struct sFont *MakeFont(const char *fontfile, int height)
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{
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YughInfo("Making font %s.", fontfile);
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int packsize = 128;
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struct sFont *newfont = calloc(1, sizeof(struct sFont));
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newfont->height = height;
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char fontpath[256];
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snprintf(fontpath, 256, "fonts/%s", fontfile);
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FILE *f = fopen(fontpath, "rb");
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fseek(f, 0, SEEK_END);
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long fsize = ftell(f);
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fseek(f, 0, SEEK_SET);
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unsigned char *ttf_buffer = malloc(fsize+1);
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fread(ttf_buffer, fsize, 1, f);
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fclose(f);
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unsigned char *bitmap = malloc(packsize*packsize);
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stbtt_packedchar glyphs[95];
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stbtt_pack_context pc;
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stbtt_PackBegin(&pc, bitmap, packsize, packsize, 0, 1, NULL);
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stbtt_PackFontRange(&pc, ttf_buffer, 0, height, 32, 95, glyphs);
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stbtt_PackEnd(&pc);
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stbi_write_png("packedfont.png", packsize, packsize, 1, bitmap, sizeof(char) * packsize);
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stbtt_fontinfo fontinfo;
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if (!stbtt_InitFont(&fontinfo, ttf_buffer, stbtt_GetFontOffsetForIndex(ttf_buffer,0))) {
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YughError("Failed to make font %s", fontfile);
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}
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glGenTextures(1, &newfont->texID);
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glBindTexture(GL_TEXTURE_2D, newfont->texID);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, packsize, packsize, 0, GL_RED, GL_UNSIGNED_BYTE, bitmap);
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//glGenerateMipmap(GL_TEXTURE_2D);
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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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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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free(ttf_buffer);
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free(bitmap);
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for (unsigned char c = 32; c < 127; c++) {
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stbtt_packedchar glyph = glyphs[c-32];
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struct glrect r;
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r.s0 = glyph.x0 / (float) packsize;
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r.s1 = glyph.x1 / (float) packsize;
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r.t0 = glyph.y0 / (float) packsize;
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r.t1 = glyph.y1 / (float) packsize;
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newfont->Characters[c].Advance = glyph.xadvance;
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newfont->Characters[c].Size[0] = glyph.x1 - glyph.x0;
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newfont->Characters[c].Size[1] = glyph.y1 - glyph.y0;
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newfont->Characters[c].Bearing[0] = glyph.xoff;
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newfont->Characters[c].Bearing[1] = glyph.yoff2;
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newfont->Characters[c].rect = r;
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}
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return newfont;
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}
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static int curchar = 0;
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static float *buffdraw;
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void draw_char_box(struct Character c, float cursor[2], float scale, float color[3])
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{
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int x, y, w, h;
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x = cursor[0];
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y = cursor[1];
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w = 8*scale;
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h = 14;
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x += w/2.f;
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y += h/2.f;
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draw_rect(x,y,w,h,color);
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}
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void fill_charverts(float *verts, float cursor[2], float scale, struct Character c, float *offset)
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{
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float w = c.Size[0] * scale;
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float h = c.Size[1] * scale;
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float xpos = cursor[0] + (c.Bearing[0]+offset[0]) * scale;
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float ypos = cursor[1] - (c.Bearing[1]+offset[1]) * scale;
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float v[16] = {
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xpos, ypos, c.rect.s0, c.rect.t1,
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xpos+w, ypos, c.rect.s1, c.rect.t1,
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xpos, ypos + h, c.rect.s0, c.rect.t0,
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xpos + w, ypos + h, c.rect.s1, c.rect.t0
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};
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memcpy(verts, v, sizeof(float)*16);
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}
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static int drawcaret = 0;
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void sdrawCharacter(struct Character c, mfloat_t cursor[2], float scale, struct shader *shader, float color[3])
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{
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float shadowcolor[3] = {0.f, 0.f, 0.f};
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float shadowcursor[2];
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float verts[16];
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float offset[2] = {-1, 1};
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fill_charverts(verts, cursor, scale, c, offset);
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curchar++;
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/* Check if the vertex is off screen */
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if (verts[5] < 0 || verts[10] < 0 || verts[0] > window_i(0)->width || verts[1] > window_i(0)->height)
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return;
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if (drawcaret == curchar) {
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draw_char_box(c, cursor, scale, color);
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shader_use(shader);
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shader_setvec3(shader, "textColor", color);
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, font->texID);
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glBindVertexArray(VAO);
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glBindBuffer(GL_ARRAY_BUFFER, VBO);
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}
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shader_setvec3(shader, "textColor", shadowcolor);
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glBufferData(GL_ARRAY_BUFFER, sizeof(verts), verts, GL_STREAM_DRAW);
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glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
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offset[0] = 1;
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offset[1] = -1;
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fill_charverts(verts, cursor, scale, c, offset);
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glBufferData(GL_ARRAY_BUFFER, sizeof(verts), verts, GL_STREAM_DRAW);
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glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
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offset[1] = 1;
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fill_charverts(verts, cursor, scale, c, offset);
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glBufferData(GL_ARRAY_BUFFER, sizeof(verts), verts, GL_STREAM_DRAW);
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glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
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offset[0] = -1;
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offset[1] = -1;
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fill_charverts(verts, cursor, scale, c, offset);
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glBufferData(GL_ARRAY_BUFFER, sizeof(verts), verts, GL_STREAM_DRAW);
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glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
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offset[0] = offset[1] = 0;
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fill_charverts(verts, cursor, scale, c, offset);
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shader_setvec3(shader, "textColor", color);
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glBufferData(GL_ARRAY_BUFFER, sizeof(verts), verts, GL_STREAM_DRAW);
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glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
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}
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void text_settype(struct sFont *mfont)
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{
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font = mfont;
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}
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void renderText(const char *text, mfloat_t pos[2], float scale, mfloat_t color[3], float lw, int caret)
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{
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int len = strlen(text);
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drawcaret = caret;
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mfloat_t cursor[2] = { 0.f };
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cursor[0] = pos[0];
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cursor[1] = pos[1];
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shader_use(shader);
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shader_setvec3(shader, "textColor", color);
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, font->texID);
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glBindVertexArray(VAO);
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glBindBuffer(GL_ARRAY_BUFFER, VBO);
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glBufferData(GL_ARRAY_BUFFER, len*16*sizeof(float)*2, NULL, GL_STREAM_DRAW); /* x2 on the size for the outline pass */
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const unsigned char *line, *wordstart, *drawstart;
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line = drawstart = (unsigned char*)text;
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curchar = 0;
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float *usecolor = color;
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float caretcolor[3] = {0.4,0.98,0.75};
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while (*line != '\0') {
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switch (*line) {
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case '\n':
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sdrawCharacter(font->Characters[*line], cursor, scale, shader, usecolor);
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cursor[1] -= scale * font->height;
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cursor[0] = pos[0];
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line++;
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break;
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case ' ':
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sdrawCharacter(font->Characters[*line], cursor, scale, shader, usecolor);
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cursor[0] += font->Characters[*line].Advance * scale;
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line++;
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break;
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case '\t':
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sdrawCharacter(font->Characters[*line], cursor, scale, shader, usecolor);
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cursor[0] += font->Characters[*line].Advance * scale;
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line++;
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break;
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default:
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wordstart = line;
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int wordWidth = 0;
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while (!isspace(*line) && *line != '\0') {
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wordWidth += font->Characters[*line].Advance * scale;
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line++;
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}
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if (lw > 0 && (cursor[0] + wordWidth - pos[0]) >= lw) {
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cursor[0] = pos[0];
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cursor[1] -= scale * font->height;
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}
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while (wordstart < line) {
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sdrawCharacter(font->Characters[*wordstart], cursor, scale, shader, usecolor);
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cursor[0] += font->Characters[*wordstart].Advance * scale;
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wordstart++;
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}
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}
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}
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// glDrawArrays(GL_TRIANGLE_STRIP, 0, 4*2);
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}
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