Sun, 19 Nov 2023 13:22:43 +0100
fix text rendering for alpha==0
1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
3 * Copyright 2023 Mike Becker. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 * POSSIBILITY OF SUCH DAMAGE.
26 */
28 #include "ascension/context.h"
29 #include "ascension/error.h"
30 #include "ascension/utils.h"
31 #include "ascension/shader.h"
33 #include <cx/linked_list.h>
35 #include <SDL2/SDL.h>
36 #include <SDL2/SDL_ttf.h>
38 AscContext asc_context;
40 void asc_context_initialize(void) {
41 if (asc_test_flag(asc_context.flags, ASC_FLAG_INITILIZED))
42 return;
43 memset(&asc_context, 0, sizeof(AscContext));
45 // initialize error buffer
46 cxBufferInit(
47 &asc_context.error_buffer,
48 NULL,
49 256,
50 NULL,
51 CX_BUFFER_AUTO_EXTEND
52 );
54 // initialize SDL
55 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
56 asc_error(SDL_GetError());
57 } else {
58 if (TTF_Init() < 0) {
59 asc_error(TTF_GetError());
60 }
61 }
62 SDL_ClearError();
63 asc_set_flag(&asc_context.flags, ASC_FLAG_INITILIZED);
64 asc_dprintf("Ascension context initialized.");
65 }
67 void asc_context_destroy(void) {
68 asc_shader_destroy_predefined();
69 for (unsigned int i = 0 ; i < ASC_MAX_WINDOWS ; i++) {
70 asc_window_destroy(&asc_context.windows[i]);
71 }
72 asc_font_cache_clear();
74 // quit SDL
75 if (TTF_WasInit())
76 TTF_Quit();
77 SDL_Quit();
79 // destroy the error buffer
80 cxBufferDestroy(&asc_context.error_buffer);
81 asc_context.flags = 0;
82 asc_dprintf("Ascension context destroyed.");
83 }
85 static void asc_event_window_resized(Uint32 id, Sint32 width, Sint32 height) {
86 for (unsigned int i = 0 ; i < ASC_MAX_WINDOWS ; i++) {
87 if (asc_context.windows[i].id == id) {
88 asc_context.windows[i].dimensions.width = width;
89 asc_context.windows[i].dimensions.height = height;
90 asc_mat4f_ortho(asc_context.windows[i].projection, 0, (float) width, (float) height, 0);
91 return;
92 }
93 }
94 }
96 bool asc_loop_next(void) {
97 // dispatch SDL events
98 SDL_Event event;
99 while (SDL_PollEvent(&event)) {
100 switch (event.type) {
101 case SDL_QUIT:
102 asc_set_flag(&asc_context.flags, ASC_FLAG_QUIT);
103 break;
104 case SDL_WINDOWEVENT: {
105 if (event.window.event == SDL_WINDOWEVENT_RESIZED)
106 asc_event_window_resized(
107 event.window.windowID,
108 event.window.data1,
109 event.window.data2
110 );
111 break;
112 }
113 case SDL_KEYDOWN:
114 // TODO: remove this code and implement key press map instead
115 if (event.key.keysym.sym == SDLK_ESCAPE)
116 return false;
117 break;
118 case SDL_KEYUP:
119 // TODO: implement key press map
120 break;
121 }
122 }
124 // sync the windows
125 for (unsigned int i = 0 ; i < ASC_MAX_WINDOWS ; i++) {
126 if (asc_context.windows[i].id > 0) {
127 asc_window_sync(&asc_context.windows[i]);
128 }
129 }
131 // compute frame time
132 static Uint32 ticks;
133 Uint32 ticks_elapsed = SDL_GetTicks() - ticks;
134 ticks = SDL_GetTicks();
135 asc_context.elapsed_millis = ticks_elapsed;
136 asc_context.elapsed = (float) ticks_elapsed / 1000.0f;
138 return !asc_test_flag(asc_context.flags, ASC_FLAG_QUIT);
139 }