Sun, 11 Aug 2024 16:11:30 +0200
add mouse and window focus - resolves #382
plus some minor code improvements
50 | 1 | /* |
2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. | |
3 | * Copyright 2024 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 | */ | |
27 | ||
28 | #include "ascension/texture.h" | |
29 | #include "ascension/error.h" | |
30 | ||
31 | #include <assert.h> | |
32 | #include <GL/glew.h> | |
33 | ||
34 | void asc_texture_bind(AscTexture const *tex, int uniform_location, int unit) { | |
35 | glActiveTexture(GL_TEXTURE0 + unit); | |
36 | GLenum error = glGetError(); | |
37 | if (error == GL_INVALID_ENUM) { | |
38 | asc_error("Tried to use more texture units than available."); | |
39 | } | |
40 | glBindTexture(tex->target, tex->tex_id); | |
41 | glUniform1i(uniform_location, unit); | |
42 | } | |
43 | ||
44 | void asc_texture_from_surface(AscTexture *tex, SDL_Surface const *surface) { | |
45 | glBindTexture(tex->target,tex->tex_id); | |
46 | glPixelStorei(GL_UNPACK_ROW_LENGTH, | |
47 | surface->pitch / surface->format->BytesPerPixel); | |
48 | glTexImage2D(tex->target, 0, GL_RGBA, | |
49 | surface->w, surface->h, | |
50 | 0, GL_BGRA, | |
51 | GL_UNSIGNED_BYTE, surface->pixels); | |
52 | } | |
53 | ||
54 | void asc_texture_init( | |
55 | AscTexture *tex, | |
56 | enum asc_texture_target target, | |
57 | enum asc_texture_min_filter min_filter, | |
58 | enum asc_texture_mag_filter mag_filter | |
59 | ) { | |
60 | static const GLenum texture_targets[] = { | |
61 | GL_TEXTURE_RECTANGLE | |
62 | }; | |
63 | static const GLint texture_filters[] = { | |
64 | GL_NEAREST, | |
65 | GL_LINEAR, | |
66 | GL_NEAREST_MIPMAP_NEAREST, | |
67 | GL_LINEAR_MIPMAP_NEAREST, | |
68 | GL_NEAREST_MIPMAP_LINEAR, | |
69 | GL_LINEAR_MIPMAP_LINEAR | |
70 | }; | |
71 | assert(target < sizeof(texture_targets) / sizeof(GLenum)); | |
72 | assert(min_filter < sizeof(texture_filters) / sizeof(GLint)); | |
73 | assert(mag_filter < 2); // mag filter only supports nearest/linear | |
74 | tex->target = texture_targets[target]; | |
75 | glGenTextures(1, &tex->tex_id); | |
76 | glBindTexture(tex->target, tex->tex_id); | |
77 | glTexParameteri(tex->target, GL_TEXTURE_MIN_FILTER, | |
78 | texture_filters[min_filter]); | |
79 | glTexParameteri(tex->target, GL_TEXTURE_MAG_FILTER, | |
80 | texture_filters[mag_filter]); | |
81 | asc_dprintf("Generated new texture for text node: %u", tex->tex_id); | |
82 | } | |
83 | ||
84 | void asc_texture_destroy(AscTexture *tex) { | |
85 | asc_dprintf("Release text node texture: %u", tex->tex_id); | |
86 | glDeleteTextures(1, &tex->tex_id); | |
87 | } |