universe@50: /*
universe@50:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
universe@50:  * Copyright 2024 Mike Becker. All rights reserved.
universe@50:  *
universe@50:  * Redistribution and use in source and binary forms, with or without
universe@50:  * modification, are permitted provided that the following conditions are met:
universe@50:  *
universe@50:  *   1. Redistributions of source code must retain the above copyright
universe@50:  *      notice, this list of conditions and the following disclaimer.
universe@50:  *
universe@50:  *   2. Redistributions in binary form must reproduce the above copyright
universe@50:  *      notice, this list of conditions and the following disclaimer in the
universe@50:  *      documentation and/or other materials provided with the distribution.
universe@50:  *
universe@50:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
universe@50:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
universe@50:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
universe@50:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
universe@50:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
universe@50:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
universe@50:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
universe@50:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
universe@50:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
universe@50:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
universe@50:  * POSSIBILITY OF SUCH DAMAGE.
universe@50:  */
universe@50: 
universe@50: #include "ascension/texture.h"
universe@50: #include "ascension/error.h"
universe@50: 
universe@50: #include <assert.h>
universe@50: #include <GL/glew.h>
universe@50: 
universe@50: void asc_texture_bind(AscTexture const *tex, int uniform_location, int unit) {
universe@50:     glActiveTexture(GL_TEXTURE0 + unit);
universe@50:     GLenum error = glGetError();
universe@50:     if (error == GL_INVALID_ENUM) {
universe@50:         asc_error("Tried to use more texture units than available.");
universe@50:     }
universe@50:     glBindTexture(tex->target, tex->tex_id);
universe@50:     glUniform1i(uniform_location, unit);
universe@50: }
universe@50: 
universe@50: void asc_texture_from_surface(AscTexture *tex, SDL_Surface const *surface) {
universe@50:     glBindTexture(tex->target,tex->tex_id);
universe@50:     glPixelStorei(GL_UNPACK_ROW_LENGTH,
universe@50:                   surface->pitch / surface->format->BytesPerPixel);
universe@50:     glTexImage2D(tex->target, 0, GL_RGBA,
universe@50:                  surface->w, surface->h,
universe@50:                  0, GL_BGRA,
universe@50:                  GL_UNSIGNED_BYTE, surface->pixels);
universe@50: }
universe@50: 
universe@50: void asc_texture_init(
universe@50:         AscTexture *tex,
universe@50:         enum asc_texture_target target,
universe@50:         enum asc_texture_min_filter min_filter,
universe@50:         enum asc_texture_mag_filter mag_filter
universe@50: ) {
universe@50:     static const GLenum texture_targets[] = {
universe@50:             GL_TEXTURE_RECTANGLE
universe@50:     };
universe@50:     static const GLint texture_filters[] = {
universe@50:             GL_NEAREST,
universe@50:             GL_LINEAR,
universe@50:             GL_NEAREST_MIPMAP_NEAREST,
universe@50:             GL_LINEAR_MIPMAP_NEAREST,
universe@50:             GL_NEAREST_MIPMAP_LINEAR,
universe@50:             GL_LINEAR_MIPMAP_LINEAR
universe@50:     };
universe@50:     assert(target < sizeof(texture_targets) / sizeof(GLenum));
universe@50:     assert(min_filter < sizeof(texture_filters) / sizeof(GLint));
universe@50:     assert(mag_filter < 2); // mag filter only supports nearest/linear
universe@50:     tex->target = texture_targets[target];
universe@50:     glGenTextures(1, &tex->tex_id);
universe@50:     glBindTexture(tex->target, tex->tex_id);
universe@50:     glTexParameteri(tex->target, GL_TEXTURE_MIN_FILTER,
universe@50:                     texture_filters[min_filter]);
universe@50:     glTexParameteri(tex->target, GL_TEXTURE_MAG_FILTER,
universe@50:                     texture_filters[mag_filter]);
universe@50:     asc_dprintf("Generated new texture for text node: %u", tex->tex_id);
universe@50: }
universe@50: 
universe@50: void asc_texture_destroy(AscTexture *tex) {
universe@50:     asc_dprintf("Release text node texture: %u", tex->tex_id);
universe@50:     glDeleteTextures(1, &tex->tex_id);
universe@50: }