ascension: src/texture.c@9c44c55d327a

consistently refer to windows by ID - fixes #381

This change discovered that the font cache is completely broken. We created issue #387 for this.

     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  */

    28 #include "ascension/texture.h"

    29 #include "ascension/error.h"

    31 #include <assert.h>

    32 #include <GL/glew.h>

    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 }

    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 }

    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 }

    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 }

Mercurial > hg > ascension / file revision