comparison: src/texture.c
src/texture.c
- changeset 50
- d8d2e4817db1
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| 49:77493525eac2 | 50:d8d2e4817db1 |
|---|---|
| 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 } |
