removed shitty opengl demo
This commit is contained in:
vurtun
parent
93db7332c7
commit
ef9570ca81
616
demo/opengl.c
616
demo/opengl.c
@ -1,616 +0,0 @@
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/*
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Copyright (c) 2015
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vurtun <polygone@gmx.net>
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MIT licence
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdarg.h>
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#include <string.h>
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#include <math.h>
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#include <assert.h>
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#include <math.h>
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#include <GL/gl.h>
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#include <GL/glu.h>
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#include <SDL2/SDL.h>
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include FT_GLYPH_H
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#include "../gui.h"
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/* macros */
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#define DTIME 16
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#define FONT_ATLAS_DEPTH 4
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#define CIRCLE_SEGMENTS 22
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#define MIN(a,b) ((a) < (b) ? (a) : (b))
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#define MAX(a,b) ((a) < (b) ? (b) : (a))
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#define CLAMP(i,v,x) (MAX(MIN(v,x), i))
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#define LEN(a) (sizeof(a)/sizeof(a)[0])
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#define UNUSED(a) ((void)(a))
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#include "demo.c"
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struct texCoord {
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float u;
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float v;
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};
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enum font_atlas_dimension {
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FONT_ATLAS_DIM_64 = 64,
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FONT_ATLAS_DIM_128 = 128,
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FONT_ATLAS_DIM_256 = 256,
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FONT_ATLAS_DIM_512 = 512,
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FONT_ATLAS_DIM_1024 = 1024,
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FONT_ATLAS_DIM_2048 = 2048
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};
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struct font_atlas {
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enum font_atlas_dimension dim;
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gui_size range;
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gui_size size;
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gui_byte *memory;
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};
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struct font_glyph {
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unsigned int code;
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float xadvance;
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short width, height;
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float xoff, yoff;
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struct texCoord uv[2];
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};
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struct font {
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float height;
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float scale;
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GLuint texture;
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unsigned int glyph_count;
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struct font_glyph *glyphes;
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const struct font_glyph *fallback;
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};
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static void
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die(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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fputs("\n", stderr);
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exit(EXIT_FAILURE);
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}
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static char*
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file_load(const char* path, size_t* siz)
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{
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char *buf;
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FILE *fd = fopen(path, "rb");
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if (!fd) {
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fprintf(stderr, "Failed to open file: %s\n", path);
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exit(EXIT_FAILURE);
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}
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fseek(fd, 0, SEEK_END);
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*siz = (size_t)ftell(fd);
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fseek(fd, 0, SEEK_SET);
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buf = calloc(*siz, 1);
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fread(buf, *siz, 1, fd);
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fclose(fd);
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return buf;
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}
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static void
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font_load_glyph(unsigned int code, struct font_glyph *glyph, FT_GlyphSlot slot)
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{
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glyph->code = code;
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glyph->width = (short)slot->bitmap.width;
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glyph->height = (short)slot->bitmap.rows;
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glyph->xoff = (float)slot->bitmap_left;
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glyph->yoff = (float)slot->bitmap_top;
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glyph->xadvance = (float)(slot->advance.x >> 6);
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}
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static void
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font_load_glyphes(FT_Face face, struct font *font, size_t range)
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{
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size_t i;
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int ft_err;
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for (i = 0; i < range; ++i) {
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unsigned int index = FT_Get_Char_Index(face, i);
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if (!index) continue;
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ft_err = FT_Load_Glyph(face, index, 0);
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if (ft_err) continue;
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ft_err = FT_Render_Glyph(face->glyph, FT_RENDER_MODE_NORMAL);
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if (ft_err) continue;
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font_load_glyph(index, &font->glyphes[i], face->glyph);
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}
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}
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static void
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font_pack_glyphes(struct font *font, float width, float height, size_t range)
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{
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size_t i;
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float xoff = 0, yoff = 0;
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float max_height = 0.0f;
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for (i = 0; i < range; ++i) {
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struct font_glyph *glyph = &font->glyphes[i];
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if ((xoff + glyph->width) > width) {
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yoff += max_height;
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max_height = 0.0f;
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xoff = 0.0f;
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}
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glyph->uv[0].u = xoff / width;
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glyph->uv[0].v = yoff / height;
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glyph->uv[1].u = (xoff + glyph->width) / width;
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glyph->uv[1].v = (yoff + glyph->height) / height;
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if (glyph->height > max_height)
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max_height = glyph->height;
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xoff += glyph->width;
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}
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}
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static void
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font_atlas_blit(struct font_atlas *atlas, FT_GlyphSlot glyph,
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size_t off_x, size_t off_y)
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{
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size_t y, x;
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size_t width = glyph->bitmap.width;
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size_t height = glyph->bitmap.rows;
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const size_t pitch = atlas->dim * FONT_ATLAS_DEPTH;
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for (y = 0; y < height; y++) {
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size_t x_off = off_x * FONT_ATLAS_DEPTH;
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size_t y_off = (off_y + y) * pitch;
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unsigned char *dst = &atlas->memory[y_off + x_off];
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for (x = 0; x < width; ++x) {
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dst[0] = 255;
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dst[1] = 255;
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dst[2] = 255;
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dst[3] = glyph->bitmap.buffer[y * width + x];
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dst += FONT_ATLAS_DEPTH;
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}
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}
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}
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static void
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font_bake_glyphes(FT_Face face, struct font_atlas *atlas,
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const struct font *font)
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{
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size_t i;
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int ft_err;
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for (i = 0; i < atlas->range; ++i) {
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size_t x, y;
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struct font_glyph *glyph = &font->glyphes[i];
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unsigned int index = FT_Get_Char_Index(face, i);
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if (!index) continue;
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ft_err = FT_Load_Glyph(face, index, 0);
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if (ft_err) continue;
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ft_err = FT_Render_Glyph(face->glyph, FT_RENDER_MODE_NORMAL);
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if (ft_err) continue;
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x = (gui_size)(glyph->uv[0].u * (gui_float)atlas->dim);
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y = (gui_size)(glyph->uv[0].v * (gui_float)atlas->dim);
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font_atlas_blit(atlas, face->glyph, x, y);
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}
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}
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static int
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font_load(struct font *font, struct font_atlas *atlas, unsigned int height,
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const unsigned char *data, size_t size)
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{
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int ret = 1;
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FT_Library ft_lib;
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FT_Face ft_face;
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assert(font);
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assert(atlas);
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assert(font->glyphes);
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assert(atlas->memory);
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if (!font || !atlas)
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return gui_false;
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if (!font->glyphes || !atlas->memory)
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return gui_false;
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if (FT_Init_FreeType(&ft_lib))
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return gui_false;
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if (FT_New_Memory_Face(ft_lib, data, (FT_Long)size, 0, &ft_face))
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goto cleanup;
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if (FT_Select_Charmap(ft_face, FT_ENCODING_UNICODE))
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goto failed;
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if (FT_Set_Char_Size(ft_face, height << 6, height << 6, 96, 96))
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goto failed;
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font_load_glyphes(ft_face, font, atlas->range);
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font_pack_glyphes(font, atlas->dim, atlas->dim, atlas->range);
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font_bake_glyphes(ft_face, atlas, font);
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failed:
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FT_Done_Face(ft_face);
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cleanup:
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FT_Done_FreeType(ft_lib);
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return ret;
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}
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static gui_size
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font_get_text_width(void *handle, const gui_char *t, gui_size l)
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{
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long unicode;
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size_t text_width = 0;
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const struct font_glyph *glyph;
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size_t text_len = 0;
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size_t glyph_len;
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struct font *font = handle;
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assert(font);
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if (!t || !l) return 0;
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glyph_len = gui_utf_decode(t, &unicode, l);
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while (text_len <= l && glyph_len) {
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if (unicode == GUI_UTF_INVALID) return 0;
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glyph = (unicode < font->glyph_count) ? &font->glyphes[unicode] : font->fallback;
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glyph = (glyph->code == 0) ? font->fallback : glyph;
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text_width += (gui_size)((float)glyph->xadvance * font->scale);
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glyph_len = gui_utf_decode(t + text_len, &unicode, l - text_len);
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text_len += glyph_len;
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}
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return text_width;
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}
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static void
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font_draw_text(const struct font *font, float x, float y, float h,
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struct gui_color color, const unsigned char *text, size_t len)
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{
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struct gui_rect clip;
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size_t text_len;
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long unicode;
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const struct font_glyph *g;
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text_len = gui_utf_decode(text, &unicode, len);
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glBindTexture(GL_TEXTURE_2D, font->texture);
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glColor4ub(color.r, color.g, color.b, color.a);
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glBegin(GL_QUADS);
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while (text_len <= len) {
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float gx, gy, gh, gw, char_width = 0;
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if (unicode == GUI_UTF_INVALID) break;
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g = (unicode < font->glyph_count) ?
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&font->glyphes[unicode] :
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font->fallback;
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g = (g->code == 0) ? font->fallback : g;
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gw = (float)g->width * font->scale;
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gh = (float)g->height * font->scale;
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gx = x + g->xoff * font->scale;
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gy = y + (h / 2) - (g->yoff * font->scale);
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char_width = g->xadvance * font->scale;
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glTexCoord2f(g->uv[0].u, g->uv[0].v);
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glVertex2f(gx, gy);
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glTexCoord2f(g->uv[1].u, g->uv[0].v);
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glVertex2f(gx + gw, gy);
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glTexCoord2f(g->uv[1].u, g->uv[1].v);
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glVertex2f(gx + gw, gy + gh);
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glTexCoord2f(g->uv[0].u, g->uv[1].v);
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glVertex2f(gx, gy + gh);
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text_len += gui_utf_decode(text + text_len, &unicode, len - text_len);
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x += char_width;
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}
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glEnd();
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glBindTexture(GL_TEXTURE_2D, 0);
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}
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static void
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font_del(struct font *font)
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{
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glDeleteTextures(1, &font->texture);
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free(font->glyphes);
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free(font);
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}
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static struct font*
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font_new(const char *path, unsigned int font_height, unsigned int bake_height,
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size_t range, enum font_atlas_dimension dim)
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{
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gui_byte *ttf_blob;
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gui_size ttf_blob_size;
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struct font_atlas atlas;
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struct font *font = calloc(sizeof(struct font), 1);
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atlas.dim = dim;
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atlas.range = range;
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atlas.size = atlas.dim * atlas.dim * FONT_ATLAS_DEPTH;
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atlas.memory = calloc((gui_size)atlas.size, 1);
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font->glyph_count = (unsigned int)atlas.range;
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font->glyphes = calloc(atlas.range, sizeof(struct font_glyph));
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font->fallback = &font->glyphes['?'];
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font->scale = (float)font_height / (gui_float)bake_height;
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font->height = (float)font_height;
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ttf_blob = (unsigned char*)file_load(path, &ttf_blob_size);
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if (!font_load(font, &atlas, bake_height, ttf_blob, ttf_blob_size))
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goto failed;
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glGenTextures(1, &font->texture);
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glBindTexture(GL_TEXTURE_2D, font->texture);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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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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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, dim, dim, 0,
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GL_RGBA, GL_UNSIGNED_BYTE, atlas.memory);
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free(atlas.memory);
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free(ttf_blob);
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return font;
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failed:
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free(atlas.memory);
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free(ttf_blob);
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font_del(font);
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return NULL;
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}
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static void
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draw_line(float x0, float y0, float x1, float y1, struct gui_color color)
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{
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glColor4ub(color.r, color.g, color.b, color.a);
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glBegin(GL_LINES);
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glVertex2f(x0, y0);
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glVertex2f(x1, y1);
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glEnd();
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}
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static void
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draw_rect(float x, float y, float w, float h, struct gui_color color)
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{
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glColor4ub(color.r, color.g, color.b, color.a);
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glBegin(GL_QUADS);
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glVertex2f(x, y);
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glVertex2f(x + w, y);
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glVertex2f(x + w, y + h);
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glVertex2f(x, y + h);
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glEnd();
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}
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static void
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draw_circle(float x, float y, float r, struct gui_color color)
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{
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int i;
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float a0 = 0.0f;
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const float a_step = (2 * 3.141592654f)/22.0f;
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x += r; y += r;
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glColor4ub(color.r, color.g, color.b, color.a);
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glBegin(GL_TRIANGLES);
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for (i = 0; i < CIRCLE_SEGMENTS; i++) {
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const float a1 = ((i + 1) == CIRCLE_SEGMENTS) ? 0.0f : a0 + a_step;
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const float p0x = x + (float)cos(a0) * r;
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const float p0y = y + (float)sin(a0) * r;
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const float p1x = x + (float)cos(a1) * r;
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const float p1y = y + (float)sin(a1) * r;
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glVertex2f(p0x, p0y);
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glVertex2f(p1x, p1y);
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glVertex2f(x, y);
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a0 = a1;
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}
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glEnd();
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}
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static void
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execute(gui_command_buffer *list, int width, int height)
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{
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static const struct gui_color col = {255, 0, 0, 255};
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const struct gui_command *cmd;
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glPushAttrib(GL_ENABLE_BIT|GL_COLOR_BUFFER_BIT|GL_TRANSFORM_BIT);
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glEnable(GL_BLEND);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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glDisable(GL_CULL_FACE);
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glDisable(GL_DEPTH_TEST);
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glEnable(GL_SCISSOR_TEST);
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glEnable(GL_TEXTURE_2D);
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glMatrixMode(GL_PROJECTION);
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glPushMatrix();
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glLoadIdentity();
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glOrtho(0.0f, width, height, 0.0f, 0.0f, 1.0f);
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glMatrixMode(GL_MODELVIEW);
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glPushMatrix();
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glLoadIdentity();
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gui_foreach_command(cmd, list) {
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switch (cmd->type) {
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case GUI_COMMAND_NOP: break;
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case GUI_COMMAND_SCISSOR: {
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const struct gui_command_scissor *s = gui_command(scissor, cmd);
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glScissor(s->x, height - (s->y + s->h), s->w, s->h);
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} break;
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case GUI_COMMAND_LINE: {
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const struct gui_command_line *l = gui_command(line, cmd);
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draw_line(l->begin[0], l->begin[1], l->end[0], l->end[1], l->color);
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} break;
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case GUI_COMMAND_RECT: {
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const struct gui_command_rect *r = gui_command(rect, cmd);
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draw_rect(r->x, r->y, r->w, r->h, r->color);
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} break;
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case GUI_COMMAND_CIRCLE: {
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const struct gui_command_circle *c = gui_command(circle, cmd);
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draw_circle(c->x, c->y, (float)c->w / 2.0f, c->color);
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} break;
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case GUI_COMMAND_TRIANGLE: {
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const struct gui_command_triangle *t = gui_command(triangle, cmd);
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glColor4ub(t->color.r, t->color.g, t->color.b, t->color.a);
|
||||
glBegin(GL_TRIANGLES);
|
||||
glVertex2f(t->a[0], t->a[1]);
|
||||
glVertex2f(t->b[0], t->b[1]);
|
||||
glVertex2f(t->c[0], t->c[1]);
|
||||
glEnd();
|
||||
} break;
|
||||
case GUI_COMMAND_TEXT: {
|
||||
const struct gui_command_text *t = gui_command(text, cmd);
|
||||
font_draw_text(t->font, t->x, t->y, t->h, t->fg, t->string, t->length);
|
||||
} break;
|
||||
case GUI_COMMAND_IMAGE:
|
||||
case GUI_COMMAND_MAX:
|
||||
default: break;
|
||||
}
|
||||
}
|
||||
|
||||
glBindTexture(GL_TEXTURE_2D, 0);
|
||||
glMatrixMode(GL_MODELVIEW);
|
||||
glPopMatrix();
|
||||
glMatrixMode(GL_PROJECTION);
|
||||
glPopMatrix();
|
||||
glPopAttrib();
|
||||
}
|
||||
|
||||
static void
|
||||
draw(struct gui_stack *stack, int width, int height)
|
||||
{
|
||||
struct gui_panel*iter;
|
||||
gui_foreach_panel(iter, stack)
|
||||
execute(iter->buffer, width, height);
|
||||
}
|
||||
|
||||
static void
|
||||
key(struct gui_input *in, SDL_Event *evt, gui_bool down)
|
||||
{
|
||||
SDL_Keycode sym = evt->key.keysym.sym;
|
||||
if (sym == SDLK_LCTRL || sym == SDLK_RCTRL)
|
||||
gui_input_key(in, GUI_KEY_CTRL, down);
|
||||
else if (sym == SDLK_RSHIFT || sym == SDLK_LSHIFT)
|
||||
gui_input_key(in, GUI_KEY_SHIFT, down);
|
||||
else if (sym == SDLK_DELETE)
|
||||
gui_input_key(in, GUI_KEY_DEL, down);
|
||||
else if (sym == SDLK_RETURN)
|
||||
gui_input_key(in, GUI_KEY_ENTER, down);
|
||||
else if (sym == SDLK_SPACE)
|
||||
gui_input_key(in, GUI_KEY_SPACE, down);
|
||||
else if (sym == SDLK_BACKSPACE)
|
||||
gui_input_key(in, GUI_KEY_BACKSPACE, down);
|
||||
}
|
||||
|
||||
static void
|
||||
motion(struct gui_input *in, SDL_Event *evt)
|
||||
{
|
||||
const gui_int x = evt->motion.x;
|
||||
const gui_int y = evt->motion.y;
|
||||
gui_input_motion(in, x, y);
|
||||
}
|
||||
|
||||
static void
|
||||
btn(struct gui_input *in, SDL_Event *evt, gui_bool down)
|
||||
{
|
||||
const gui_int x = evt->button.x;
|
||||
const gui_int y = evt->button.y;
|
||||
if (evt->button.button == SDL_BUTTON_LEFT)
|
||||
gui_input_button(in, x, y, down);
|
||||
}
|
||||
|
||||
static void
|
||||
text(struct gui_input *in, SDL_Event *evt)
|
||||
{
|
||||
gui_glyph glyph;
|
||||
memcpy(glyph, evt->text.text, GUI_UTF_SIZE);
|
||||
gui_input_char(in, glyph);
|
||||
}
|
||||
|
||||
static void
|
||||
resize(SDL_Event *evt)
|
||||
{
|
||||
if (evt->window.event != SDL_WINDOWEVENT_RESIZED) return;
|
||||
glViewport(0, 0, evt->window.data1, evt->window.data2);
|
||||
}
|
||||
|
||||
int
|
||||
main(int argc, char *argv[])
|
||||
{
|
||||
/* Platform */
|
||||
const char *font_path;
|
||||
SDL_Window *win;
|
||||
SDL_GLContext glContext;
|
||||
struct font *glfont;
|
||||
int win_width, win_height;
|
||||
unsigned int started;
|
||||
unsigned int dt;
|
||||
int width = 0, height = 0;
|
||||
|
||||
/* GUI */
|
||||
struct gui_input in;
|
||||
struct gui_font font;
|
||||
struct demo_gui gui;
|
||||
|
||||
font_path = argv[1];
|
||||
if (argc < 2) {
|
||||
fprintf(stdout, "Missing TTF Font file argument!");
|
||||
exit(EXIT_FAILURE);
|
||||
}
|
||||
|
||||
/* SDL */
|
||||
SDL_Init(SDL_INIT_VIDEO|SDL_INIT_TIMER|SDL_INIT_EVENTS);
|
||||
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
|
||||
win = SDL_CreateWindow("Demo",
|
||||
SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
|
||||
WINDOW_WIDTH, WINDOW_HEIGHT, SDL_WINDOW_OPENGL|SDL_WINDOW_SHOWN);
|
||||
glContext = SDL_GL_CreateContext(win);
|
||||
SDL_GetWindowSize(win, &win_width, &win_height);
|
||||
glViewport(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT);
|
||||
glfont = font_new(font_path, 10, 10, 255, FONT_ATLAS_DIM_256);
|
||||
|
||||
/* GUI */
|
||||
memset(&in, 0, sizeof in);
|
||||
memset(&gui, 0, sizeof gui);
|
||||
gui.memory = malloc(MAX_MEMORY);
|
||||
font.userdata = glfont;
|
||||
font.height = glfont->height;
|
||||
font.width = font_get_text_width;
|
||||
init_demo(&gui, &font);
|
||||
|
||||
while (gui.running) {
|
||||
/* Input */
|
||||
SDL_Event evt;
|
||||
started = SDL_GetTicks();
|
||||
gui_input_begin(&in);
|
||||
while (SDL_PollEvent(&evt)) {
|
||||
if (evt.type == SDL_WINDOWEVENT) resize(&evt);
|
||||
else if (evt.type == SDL_QUIT) goto cleanup;
|
||||
else if (evt.type == SDL_KEYUP) key(&in, &evt, gui_false);
|
||||
else if (evt.type == SDL_KEYDOWN) key(&in, &evt, gui_true);
|
||||
else if (evt.type == SDL_MOUSEBUTTONDOWN) btn(&in, &evt, gui_true);
|
||||
else if (evt.type == SDL_MOUSEBUTTONUP) btn(&in, &evt, gui_false);
|
||||
else if (evt.type == SDL_MOUSEMOTION) motion(&in, &evt);
|
||||
else if (evt.type == SDL_TEXTINPUT) text(&in, &evt);
|
||||
}
|
||||
gui_input_end(&in);
|
||||
|
||||
/* GUI */
|
||||
SDL_GetWindowSize(win, &width, &height);
|
||||
run_demo(&gui, &in);
|
||||
|
||||
/* Draw */
|
||||
glClearColor(0.4f, 0.4f, 0.4f, 1.0f);
|
||||
glClear(GL_COLOR_BUFFER_BIT);
|
||||
draw(&gui.stack, width, height);
|
||||
SDL_GL_SwapWindow(win);
|
||||
|
||||
/* Timing */
|
||||
dt = SDL_GetTicks() - started;
|
||||
if (dt < DTIME)
|
||||
SDL_Delay(DTIME - dt);
|
||||
}
|
||||
|
||||
cleanup:
|
||||
/* Cleanup */
|
||||
free(gui.memory);
|
||||
font_del(glfont);
|
||||
SDL_GL_DeleteContext(glContext);
|
||||
SDL_DestroyWindow(win);
|
||||
SDL_Quit();
|
||||
return 0;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user