comparison: src/primitives.c
src/primitives.c
- changeset 16
- c5dde81b6fb2
- parent 14
- 9dbfc0031887
- child 44
- b3da4096c607
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| 15:362b7659dc76 | 16:c5dde81b6fb2 |
|---|---|
| 1 /* | |
| 2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. | |
| 3 * Copyright 2023 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/primitives.h" | |
| 29 #include "ascension/error.h" | |
| 30 #include "ascension/context.h" | |
| 31 | |
| 32 #include <string.h> | |
| 33 #include <GL/glew.h> | |
| 34 | |
| 35 static void asc_primitives_init_plane(AscMesh *mesh) { | |
| 36 asc_dprintf("Create primitive plane in VBO %u and VAO %u", mesh->vbo, mesh->vao); | |
| 37 mesh->vertices = 4; | |
| 38 float data[8] = { | |
| 39 0.0f, 0.0f, // bottom left | |
| 40 0.0f, 1.0f, // top left | |
| 41 1.0f, 0.0f, // bottom right | |
| 42 1.0f, 1.0f // top right | |
| 43 }; | |
| 44 glBindBuffer(GL_ARRAY_BUFFER, mesh->vbo); | |
| 45 glBufferData(GL_ARRAY_BUFFER, sizeof(data), data, GL_STATIC_DRAW); | |
| 46 glBindVertexArray(mesh->vao); | |
| 47 glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, NULL); | |
| 48 glEnableVertexAttribArray(0); | |
| 49 } | |
| 50 | |
| 51 bool asc_primitives_init(AscPrimitives *primitives) { | |
| 52 asc_dprintf("Create primitives for the GL context of active window."); | |
| 53 // TODO: more primitives | |
| 54 | |
| 55 GLuint buffers[1]; | |
| 56 GLuint arrays[1]; | |
| 57 glGenBuffers(1, buffers); | |
| 58 glGenVertexArrays(1, arrays); | |
| 59 | |
| 60 AscMesh *plane = &(primitives->plane); | |
| 61 plane->vbo = buffers[0]; | |
| 62 plane->vao = arrays[0]; | |
| 63 asc_primitives_init_plane(plane); | |
| 64 | |
| 65 GLenum error = glGetError(); | |
| 66 if (error == GL_NO_ERROR) { | |
| 67 return true; | |
| 68 } else { | |
| 69 asc_error_gl(error, CX_STR("Initialization of primitive meshes failed.")); | |
| 70 return false; | |
| 71 } | |
| 72 } | |
| 73 | |
| 74 void asc_primitives_destroy(AscPrimitives *primitives) { | |
| 75 asc_dprintf("Destroy primitives in GL context of active window."); | |
| 76 | |
| 77 GLuint buffers[1]; | |
| 78 GLuint arrays[1]; | |
| 79 | |
| 80 buffers[0] = primitives->plane.vbo; | |
| 81 arrays[0] = primitives->plane.vao; | |
| 82 | |
| 83 glDeleteBuffers(1, buffers); | |
| 84 glDeleteVertexArrays(1, arrays); | |
| 85 | |
| 86 memset(primitives, 0, sizeof(AscPrimitives)); | |
| 87 } | |
| 88 | |
| 89 void asc_primitives_draw_plane(void) { | |
| 90 AscMesh const *mesh = &(asc_context.active_window->primitives.plane); | |
| 91 glBindVertexArray(mesh->vao); | |
| 92 glDrawArrays(GL_TRIANGLE_STRIP, 0, mesh->vertices); | |
| 93 } |
