diff options
author | pommicket <pommicket@gmail.com> | 2023-07-18 13:59:44 -0400 |
---|---|---|
committer | pommicket <pommicket@gmail.com> | 2023-07-19 19:02:27 -0400 |
commit | be5dab846e38420961a68ff4503a48e2bd8bdf6b (patch) | |
tree | 351daf84a8ffdc93939edf554d51a6d90f22ffbc /text.c | |
parent | 533345302e16ff8b485cc719d6bf8c1f5d043445 (diff) |
multiple font textuers
Diffstat (limited to 'text.c')
-rw-r--r-- | text.c | 182 |
1 files changed, 91 insertions, 91 deletions
@@ -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); |