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-rw-r--r--text.c182
1 files changed, 91 insertions, 91 deletions
diff --git a/text.c b/text.c
index f2994aa..670f2d0 100644
--- a/text.c
+++ b/text.c
@@ -33,7 +33,7 @@ typedef struct {
// characters are split into this many "buckets" according to
// their least significant bits. this is to create a Budget Hash Map™.
// must be a power of 2.
-#define CHAR_BUCKET_COUNT (1 << 10)
+#define CHAR_BUCKET_COUNT (1 << 12)
#define FONT_TEXTURE_WIDTH 512 // width of each texture
#define FONT_TEXTURE_HEIGHT 512 // height of each texture
@@ -134,6 +134,52 @@ static u32 char_bucket_index(char32_t c) {
return c & (CHAR_BUCKET_COUNT - 1);
}
+
+static FontTexture *font_new_texture(Font *font) {
+ debug_println("Create new texture for font %p", (void *)font);
+ PROFILE_TIME(start);
+ unsigned char *pixels = calloc(FONT_TEXTURE_WIDTH, FONT_TEXTURE_HEIGHT);
+ if (!pixels) {
+ text_set_err("Not enough memory for font bitmap.");
+ return NULL;
+ }
+ FontTexture *texture = arr_addp(font->textures);
+ stbtt_PackBegin(&font->pack_context, pixels, FONT_TEXTURE_WIDTH, FONT_TEXTURE_HEIGHT,
+ FONT_TEXTURE_WIDTH, 1, NULL);
+ glGenTextures(1, &texture->tex);
+ PROFILE_TIME(end);
+ texture->pixels = pixels;
+ #if PROFILE
+ printf("- create font texture: %.1fms\n", 1e3 * (end - start));
+ #endif
+ return texture;
+}
+
+static void font_texture_update_if_needed(FontTexture *texture) {
+ if (texture->needs_update) {
+ PROFILE_TIME(start);
+ glBindTexture(GL_TEXTURE_2D, texture->tex);
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, FONT_TEXTURE_WIDTH, FONT_TEXTURE_HEIGHT, 0, GL_RED, GL_UNSIGNED_BYTE, texture->pixels);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ PROFILE_TIME(end);
+
+ #if PROFILE
+ printf("- update font texture: %.1fms\n", 1e3 * (end - start));
+ #endif
+ //stbi_write_png("out.png", FONT_TEXTURE_WIDTH, FONT_TEXTURE_HEIGHT, 1, texture->pixels, FONT_TEXTURE_WIDTH);
+ texture->needs_update = false;
+ }
+}
+
+static void font_texture_free(FontTexture *texture) {
+ glDeleteTextures(1, &texture->tex);
+ arr_free(texture->triangles);
+ if (texture->pixels)
+ free(texture->pixels);
+ memset(texture, 0, sizeof *texture);
+}
+
// on success, *info is filled out
static Status text_load_char(Font *font, char32_t c, CharInfo *info) {
u32 bucket = char_bucket_index(c);
@@ -148,77 +194,41 @@ static Status text_load_char(Font *font, char32_t c, CharInfo *info) {
glGetError(); // clear error
if (!font->textures) {
- unsigned char *pixels = calloc(FONT_TEXTURE_WIDTH, FONT_TEXTURE_HEIGHT);
- if (!pixels) {
- text_set_err("Not enough memory for font bitmap.");
+ if (!font_new_texture(font))
return false;
- }
- stbtt_PackBegin(&font->pack_context, pixels, FONT_TEXTURE_WIDTH, FONT_TEXTURE_HEIGHT,
- FONT_TEXTURE_WIDTH, 1, NULL);
- FontTexture *texture = arr_addp(font->textures);
- glGenTextures(1, &texture->tex);
- texture->pixels = pixels;
}
+ int success = 0;
FontTexture *texture = arr_lastp(font->textures);
- {
+ for (int i = 0; i < 2; i++) {
info->c = c;
info->texture = arr_len(font->textures) - 1;
- int success = stbtt_PackFontRange(&font->pack_context, font->ttf_data, 0, font->char_height,
+ success = stbtt_PackFontRange(&font->pack_context, font->ttf_data, 0, font->char_height,
(int)c, 1, &info->data);
- printf("%lc %d\n",c,success);
+ if (success) break;
+ // texture is full; create a new one
+ stbtt_PackEnd(&font->pack_context);
+ font_texture_update_if_needed(texture);
+ free(texture->pixels);
+ texture->pixels = NULL;
+ texture = font_new_texture(font);
+ if (!texture)
+ return false;
}
- texture->needs_update = true;
- arr_add(font->char_info[bucket], *info);
- return true;
-#if 0
- font->char_pages[page] = calloc(CHAR_PAGE_SIZE, sizeof *font->char_pages[page]);
- for (int bitmap_width = 128, bitmap_height = 128; bitmap_width <= 4096; bitmap_width *= 2, bitmap_height *= 2) {
- u8 *bitmap = calloc((size_t)bitmap_width, (size_t)bitmap_height);
- if (bitmap) {
- int err = stbtt_BakeFontBitmap(font->ttf_data, 0, font->char_height, bitmap,
- bitmap_width, bitmap_height, page * CHAR_PAGE_SIZE, CHAR_PAGE_SIZE, font->char_pages[page]);
- if (err > 0) {
- // font converted to bitmap successfully.
- GLuint texture = 0;
- glGenTextures(1, &texture);
- glBindTexture(GL_TEXTURE_2D, texture);
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, bitmap_width, bitmap_height, 0, GL_RED, GL_UNSIGNED_BYTE, bitmap);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
- #if DEBUG
- debug_println("Loaded font page %p:%03d with %dx%d bitmap as texture %u.", (void *)font, page, bitmap_width, bitmap_height, texture);
- #endif
- font->textures[page] = texture;
- font->tex_widths[page] = bitmap_width;
- font->tex_heights[page] = bitmap_height;
- GLenum glerr = glGetError();
- if (glerr) {
- text_set_err("Couldn't create texture for font (GL error %u).", glerr);
- if (texture) glDeleteTextures(1, &texture);
- break;
- }
- }
- } else {
- text_set_err("Not enough memory for font bitmap.");
- }
- free(bitmap);
- if (font->textures[page]) { // if font loaded successfully
- break;
- }
- }
- if (!font->textures[page] && !text_has_err()) {
- text_set_err("Couldn't convert font to bitmap.");
- }
- if (text_has_err()) {
- free(font->char_pages[page]);
- font->char_pages[page] = NULL;
+ if (!success) {
+ // a brand new texture couldn't fit the character.
+ // something has gone horribly wrong.
+ font_texture_free(texture);
+ arr_remove_last(font->textures);
+ text_set_err("Error rasterizing character %lc", (wchar_t)c);
return false;
}
+
+ texture->needs_update = true;
+
+ arr_add(font->char_info[bucket], *info);
return true;
-#endif
-
}
Font *text_font_load(const char *ttf_filename, float font_size) {
@@ -287,35 +297,26 @@ float text_font_char_width(Font *font, char32_t c) {
void text_render(Font *font) {
arr_foreach_ptr(font->textures, FontTexture, texture) {
size_t ntriangles = arr_len(texture->triangles);
- if (ntriangles) {
- if (texture->needs_update) {
- glBindTexture(GL_TEXTURE_2D, texture->tex);
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, FONT_TEXTURE_WIDTH, FONT_TEXTURE_HEIGHT, 0, GL_RED, GL_UNSIGNED_BYTE, texture->pixels);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-
- //stbi_write_png("out.png", FONT_TEXTURE_WIDTH, FONT_TEXTURE_HEIGHT, 1, texture->pixels, FONT_TEXTURE_WIDTH);
- texture->needs_update = false;
- }
- // render these triangles
- if (gl_version_major >= 3)
- glBindVertexArray(text_vao);
- glBindBuffer(GL_ARRAY_BUFFER, text_vbo);
- glBufferData(GL_ARRAY_BUFFER, (GLsizeiptr)(ntriangles * sizeof(TextTriangle)), texture->triangles, GL_STREAM_DRAW);
- glVertexAttribPointer(text_v_pos, 2, GL_FLOAT, 0, sizeof(TextVertex), (void *)offsetof(TextVertex, pos));
- glEnableVertexAttribArray(text_v_pos);
- glVertexAttribPointer(text_v_tex_coord, 2, GL_FLOAT, 0, sizeof(TextVertex), (void *)offsetof(TextVertex, tex_coord));
- glEnableVertexAttribArray(text_v_tex_coord);
- glVertexAttribPointer(text_v_color, 4, GL_FLOAT, 0, sizeof(TextVertex), (void *)offsetof(TextVertex, color));
- glEnableVertexAttribArray(text_v_color);
- glUseProgram(text_program);
- glActiveTexture(GL_TEXTURE0);
- glBindTexture(GL_TEXTURE_2D, texture->tex);
- glUniform1i(text_u_sampler, 0);
- glUniform2f(text_u_window_size, gl_window_width, gl_window_height);
- glDrawArrays(GL_TRIANGLES, 0, (GLsizei)(3 * ntriangles));
- arr_clear(texture->triangles);
- }
+ if (!ntriangles) continue;
+ font_texture_update_if_needed(texture);
+ // render these triangles
+ if (gl_version_major >= 3)
+ glBindVertexArray(text_vao);
+ glBindBuffer(GL_ARRAY_BUFFER, text_vbo);
+ glBufferData(GL_ARRAY_BUFFER, (GLsizeiptr)(ntriangles * sizeof(TextTriangle)), texture->triangles, GL_STREAM_DRAW);
+ glVertexAttribPointer(text_v_pos, 2, GL_FLOAT, 0, sizeof(TextVertex), (void *)offsetof(TextVertex, pos));
+ glEnableVertexAttribArray(text_v_pos);
+ glVertexAttribPointer(text_v_tex_coord, 2, GL_FLOAT, 0, sizeof(TextVertex), (void *)offsetof(TextVertex, tex_coord));
+ glEnableVertexAttribArray(text_v_tex_coord);
+ glVertexAttribPointer(text_v_color, 4, GL_FLOAT, 0, sizeof(TextVertex), (void *)offsetof(TextVertex, color));
+ glEnableVertexAttribArray(text_v_color);
+ glUseProgram(text_program);
+ glActiveTexture(GL_TEXTURE0);
+ glBindTexture(GL_TEXTURE_2D, texture->tex);
+ glUniform1i(text_u_sampler, 0);
+ glUniform2f(text_u_window_size, gl_window_width, gl_window_height);
+ glDrawArrays(GL_TRIANGLES, 0, (GLsizei)(3 * ntriangles));
+ arr_clear(texture->triangles);
}
}
@@ -497,8 +498,7 @@ void text_get_size32(Font *font, const char32_t *text, u64 len, float *width, fl
void text_font_free(Font *font) {
free(font->ttf_data);
arr_foreach_ptr(font->textures, FontTexture, texture) {
- glDeleteTextures(1, &texture->tex);
- arr_free(texture->triangles);
+ font_texture_free(texture);
}
arr_free(font->textures);
free(font);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 09:07:16 +0000