universe@3: /*
universe@3:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
universe@3:  * Copyright 2023 Mike Becker. All rights reserved.
universe@3:  *
universe@3:  * Redistribution and use in source and binary forms, with or without
universe@3:  * modification, are permitted provided that the following conditions are met:
universe@3:  *
universe@3:  *   1. Redistributions of source code must retain the above copyright
universe@3:  *      notice, this list of conditions and the following disclaimer.
universe@3:  *
universe@3:  *   2. Redistributions in binary form must reproduce the above copyright
universe@3:  *      notice, this list of conditions and the following disclaimer in the
universe@3:  *      documentation and/or other materials provided with the distribution.
universe@3:  *
universe@3:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
universe@3:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
universe@3:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
universe@3:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
universe@3:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
universe@3:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
universe@3:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
universe@3:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
universe@3:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
universe@3:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
universe@3:  * POSSIBILITY OF SUCH DAMAGE.
universe@3:  */
universe@3: 
universe@16: #include "ascension/primitives.h"
universe@16: #include "ascension/error.h"
universe@16: #include "ascension/context.h"
universe@3: 
universe@16: #include <string.h>
universe@16: #include <GL/glew.h>
universe@11: 
universe@16: static void asc_primitives_init_plane(AscMesh *mesh) {
universe@16:     asc_dprintf("Create primitive plane in VBO %u and VAO %u", mesh->vbo, mesh->vao);
universe@16:     mesh->vertices = 4;
universe@16:     float data[8] = {
universe@16:             0.0f, 0.0f, // bottom left
universe@16:             0.0f, 1.0f,    // top left
universe@16:             1.0f, 0.0f, // bottom right
universe@16:             1.0f, 1.0f    // top right
universe@16:     };
universe@16:     glBindBuffer(GL_ARRAY_BUFFER, mesh->vbo);
universe@16:     glBufferData(GL_ARRAY_BUFFER, sizeof(data), data, GL_STATIC_DRAW);
universe@16:     glBindVertexArray(mesh->vao);
universe@16:     glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, NULL);
universe@16:     glEnableVertexAttribArray(0);
universe@16: }
universe@4: 
universe@16: bool asc_primitives_init(AscPrimitives *primitives) {
universe@16:     asc_dprintf("Create primitives for the GL context of active window.");
universe@16:     // TODO: more primitives
universe@4: 
universe@16:     GLuint buffers[1];
universe@16:     GLuint arrays[1];
universe@16:     glGenBuffers(1, buffers);
universe@16:     glGenVertexArrays(1, arrays);
universe@4: 
universe@16:     AscMesh *plane = &(primitives->plane);
universe@16:     plane->vbo = buffers[0];
universe@16:     plane->vao = arrays[0];
universe@16:     asc_primitives_init_plane(plane);
universe@11: 
universe@16:     GLenum error = glGetError();
universe@16:     if (error == GL_NO_ERROR) {
universe@16:         return true;
universe@16:     } else {
universe@16:         asc_error_gl(error, CX_STR("Initialization of primitive meshes failed."));
universe@16:         return false;
universe@16:     }
universe@16: }
universe@11: 
universe@16: void asc_primitives_destroy(AscPrimitives *primitives) {
universe@16:     asc_dprintf("Destroy primitives in GL context of active window.");
universe@3: 
universe@16:     GLuint buffers[1];
universe@16:     GLuint arrays[1];
universe@16: 
universe@16:     buffers[0] = primitives->plane.vbo;
universe@16:     arrays[0] = primitives->plane.vao;
universe@16: 
universe@16:     glDeleteBuffers(1, buffers);
universe@16:     glDeleteVertexArrays(1, arrays);
universe@16: 
universe@16:     memset(primitives, 0, sizeof(AscPrimitives));
universe@16: }
universe@16: 
universe@16: void asc_primitives_draw_plane(void) {
universe@16:     AscMesh const *mesh = &(asc_context.active_window->primitives.plane);
universe@16:     glBindVertexArray(mesh->vao);
universe@16:     glDrawArrays(GL_TRIANGLE_STRIP, 0, mesh->vertices);
universe@16: }