comparison: src/shader.c
src/shader.c
- changeset 15
- 362b7659dc76
- child 16
- c5dde81b6fb2
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| 14:9dbfc0031887 | 15:362b7659dc76 |
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| 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/shader.h" | |
| 29 #include "ascension/files.h" | |
| 30 #include "ascension/error.h" | |
| 31 | |
| 32 #include <GL/glew.h> | |
| 33 | |
| 34 AscShaderProgram ASC_SHADER_FONT; | |
| 35 | |
| 36 | |
| 37 AscShader asc_shader_compile(unsigned int type, | |
| 38 char const *code, | |
| 39 int length) { | |
| 40 GLuint id = glCreateShader(type); | |
| 41 if (id == 0) { | |
| 42 asc_error("glCreateShader failed"); | |
| 43 return (AscShader) {0}; | |
| 44 } | |
| 45 | |
| 46 GLint success; | |
| 47 glShaderSource(id, 1, &code, &length); | |
| 48 glCompileShader(id); | |
| 49 glGetShaderiv(id, GL_COMPILE_STATUS, &success); | |
| 50 if (success) { | |
| 51 asc_dprintf("Shader %u compiled", id); | |
| 52 return (AscShader) {id}; | |
| 53 } else { | |
| 54 char *log = malloc(1024); | |
| 55 glGetShaderInfoLog(id, 1024, NULL, log); | |
| 56 glDeleteShader(id); | |
| 57 asc_error(log); | |
| 58 free(log); | |
| 59 return (AscShader) {0}; | |
| 60 } | |
| 61 } | |
| 62 | |
| 63 AscShader asc_shader_compilef(unsigned int type, | |
| 64 char const *filename) { | |
| 65 asc_file code = asc_file_mmap_rdonly(filename); | |
| 66 if (code.ptr == NULL) { | |
| 67 asc_error("Mapping shader file into memory failed"); | |
| 68 return (AscShader) {0}; | |
| 69 } | |
| 70 AscShader ret = asc_shader_compile(type, code.ptr, code.length); | |
| 71 asc_file_unmap(code); | |
| 72 return ret; | |
| 73 } | |
| 74 | |
| 75 AscShaderProgram asc_shader_link(AscShader vertex, | |
| 76 AscShader fragment) { | |
| 77 if (vertex.id == 0 || fragment.id == 0) { | |
| 78 asc_dprintf("Skip linking shader program - shaders have not been loaded correctly."); | |
| 79 return (AscShaderProgram) {0}; | |
| 80 } | |
| 81 | |
| 82 GLint success; | |
| 83 GLint id = glCreateProgram(); | |
| 84 if (id <= 0) { | |
| 85 asc_error("glCreateProgram failed"); | |
| 86 return (AscShaderProgram) {0}; | |
| 87 } | |
| 88 glAttachShader(id, vertex.id); | |
| 89 glAttachShader(id, fragment.id); | |
| 90 glLinkProgram(id); | |
| 91 glGetProgramiv(id, GL_LINK_STATUS, &success); | |
| 92 glDetachShader(id, vertex.id); | |
| 93 glDetachShader(id, fragment.id); | |
| 94 if (success) { | |
| 95 asc_dprintf("Shader Program %u linked (vtf: %u, frag: %u)", id, vertex.id, fragment.id); | |
| 96 return (AscShaderProgram) {id}; | |
| 97 } else { | |
| 98 char *log = malloc(1024); | |
| 99 glGetProgramInfoLog(id, 1024, NULL, log); | |
| 100 glDeleteShader(id); | |
| 101 asc_error(log); | |
| 102 free(log); | |
| 103 return (AscShaderProgram) {0}; | |
| 104 } | |
| 105 } | |
| 106 | |
| 107 void asc_shader_destroy(AscShader shader) { | |
| 108 if (shader.id > 0) { | |
| 109 asc_dprintf("Delete Shader %u", shader.id); | |
| 110 glDeleteShader(shader.id); | |
| 111 } | |
| 112 shader.id = 0; | |
| 113 } | |
| 114 | |
| 115 void asc_shader_program_destroy(AscShaderProgram program) { | |
| 116 if (program.id > 0) { | |
| 117 asc_dprintf("Delete Shader Program %u", program.id); | |
| 118 glDeleteProgram(program.id); | |
| 119 } | |
| 120 program.id = 0; | |
| 121 } | |
| 122 | |
| 123 static AscShaderProgram asc_shader_compile_link_discard( | |
| 124 char const *vtxName, char const *fragName) { | |
| 125 AscShader font_vtx = asc_shader_compilef(GL_VERTEX_SHADER, vtxName); | |
| 126 AscShader font_frag = asc_shader_compilef(GL_FRAGMENT_SHADER, fragName); | |
| 127 AscShaderProgram prog = asc_shader_link(font_vtx, font_frag); | |
| 128 asc_shader_destroy(font_vtx); | |
| 129 asc_shader_destroy(font_frag); | |
| 130 return prog; | |
| 131 } | |
| 132 | |
| 133 void asc_shader_initialize_predefined(void) { | |
| 134 ASC_SHADER_FONT = asc_shader_compile_link_discard("shader/font_vtx.glsl", "shader/font_frag.glsl"); | |
| 135 } | |
| 136 | |
| 137 void asc_shader_destroy_predefined(void) { | |
| 138 asc_shader_program_destroy(ASC_SHADER_FONT); | |
| 139 } |
