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Font rendering

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This commit is contained in:
John Alanbrook
2022-06-30 18:03:17 +00:00
parent 2bc9bb65af
commit edf16b4267
2 changed files with 81 additions and 71 deletions
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118
source/engine/font.c
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@@ -22,64 +22,8 @@ static struct mShader *shader;
void font_init(struct mShader *textshader) {
shader = textshader;
}
void font_frame(struct mSDLWindow *w) {
shader_use(shader);
}
struct sFont *MakeFont(const char *fontfile, int height)
{
struct sFont *newfont = calloc(1, sizeof(struct sFont));
newfont->height = height;
char fontpath[256];
snprintf(fontpath, 256, "fonts/%s", fontfile);
fread(ttf_buffer, 1, 1<<25, fopen(fontpath, "rb"));
stbtt_fontinfo fontinfo = { 0 };
if (!stbtt_InitFont(&fontinfo, ttf_buffer, stbtt_GetFontOffsetForIndex(ttf_buffer,0))) {
printf("failed\n");
}
float scale = stbtt_ScaleForPixelHeight(&fontinfo, 64);
int ascent, descent, linegap;
stbtt_GetFontVMetrics(&fontinfo, &ascent, &descent, &linegap);
ascent = roundf(ascent*scale);
descent=roundf(descent*scale);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
for (unsigned char c = 32; c < 128; c++) {
unsigned char *bitmap;
int advance, lsb, w, h;
stbtt_GetCodepointHMetrics(&fontinfo, c, &advance, &lsb);
bitmap = stbtt_GetCodepointBitmap(&fontinfo, 0,
stbtt_ScaleForPixelHeight(&fontinfo, newfont->height), c, &w, &h, 0, 0);
GLuint ftexture;
glGenTextures(1, &ftexture);
glBindTexture(GL_TEXTURE_2D, ftexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, w, h, 0, GL_RED, GL_UNSIGNED_BYTE, bitmap);
//glGenerateMipmap(GL_TEXTURE_2D);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR_MIPMAP_LINEAR);
newfont->Characters[c].TextureID = ftexture;
newfont->Characters[c].Advance = advance;
newfont->Characters[c].Size[0] = w;
newfont->Characters[c].Size[1] = h;
newfont->Characters[c].Bearing[0] = lsb;
newfont->Characters[c].Bearing[1] = 0;
}
// configure VAO/VBO for texture quads
glGenVertexArrays(1, &VAO);
@@ -93,7 +37,67 @@ struct sFont *MakeFont(const char *fontfile, int height)
glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 4 * sizeof(float), 0);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindVertexArray(0);
}
void font_frame(struct mSDLWindow *w) {
shader_use(shader);
}
// Height in pixels
struct sFont *MakeFont(const char *fontfile, int height)
{
shader_use(shader);
struct sFont *newfont = calloc(1, sizeof(struct sFont));
newfont->height = height;
char fontpath[256];
snprintf(fontpath, 256, "fonts/%s", fontfile);
fread(ttf_buffer, 1, 1<<25, fopen(fontpath, "rb"));
stbtt_fontinfo fontinfo;
if (!stbtt_InitFont(&fontinfo, ttf_buffer, stbtt_GetFontOffsetForIndex(ttf_buffer,0))) {
printf("failed\n");
}
float scale = stbtt_ScaleForPixelHeight(&fontinfo, height);
int ascent, descent, linegap;
stbtt_GetFontVMetrics(&fontinfo, &ascent, &descent, &linegap);
ascent = roundf(ascent*scale);
descent = roundf(descent*scale);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
for (unsigned char c = 32; c < 128; c++) {
unsigned char *bitmap;
int advance, lsb, w, h, x0, y0;
stbtt_GetCodepointHMetrics(&fontinfo, c, &advance, &lsb);
bitmap = stbtt_GetCodepointBitmap(&fontinfo, scale, scale, c, &w, &h, &x0, &y0);
GLuint ftexture;
glGenTextures(1, &ftexture);
glBindTexture(GL_TEXTURE_2D, ftexture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, w, h, 0, GL_RED, GL_UNSIGNED_BYTE, bitmap);
//glGenerateMipmap(GL_TEXTURE_2D);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR_MIPMAP_LINEAR);
newfont->Characters[c].TextureID = ftexture;
newfont->Characters[c].Advance = advance * scale;
newfont->Characters[c].Size[0] = w;
newfont->Characters[c].Size[1] = h;
newfont->Characters[c].Bearing[0] = x0;
newfont->Characters[c].Bearing[1] = y0;
}
return newfont;
}
@@ -157,7 +161,7 @@ void sdrawCharacter(struct Character c, mfloat_t cursor[2], float scale, struct
*/
//// Character pass
shader_setvec3(shader, "textColor", color);
//shader_setvec3(shader, "textColor", color);
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(verts), verts);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);