comparison: src/glcontext.c
src/glcontext.c
- changeset 44
- b3da4096c607
- child 50
- d8d2e4817db1
equal
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| 43:5a8c31904e44 | 44:b3da4096c607 |
|---|---|
| 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/glcontext.h" | |
| 29 #include "ascension/error.h" | |
| 30 | |
| 31 #include <cx/printf.h> | |
| 32 | |
| 33 #include <GL/glew.h> | |
| 34 | |
| 35 static void asc_gl_debug_callback( | |
| 36 GLenum source, GLenum type, GLuint id, GLenum severity, | |
| 37 GLsizei length, const GLchar* message, | |
| 38 const void* userParam | |
| 39 ) { | |
| 40 cxmutstr buf = cx_asprintf( | |
| 41 "source = %d, id = %u, type = %d, severity= %d, message = %.*s", | |
| 42 source, id, type, severity, length, message); | |
| 43 if (type == GL_DEBUG_TYPE_ERROR) { | |
| 44 asc_error(buf.ptr); | |
| 45 } else { | |
| 46 asc_dprintf("GL debug: %.*s", (int)buf.length, buf.ptr); | |
| 47 } | |
| 48 cx_strfree(&buf); | |
| 49 } | |
| 50 | |
| 51 static void asc_shader_initialize_predefined(AscGLContext *ctx) { | |
| 52 AscShaderSprite *sprite = &ctx->shader.sprite; | |
| 53 sprite->base = asc_shader_easy_compile_and_link("shader/sprite_vtx.glsl", "shader/sprite_frag.glsl"); | |
| 54 sprite->surface = glGetUniformLocation(sprite->base.id, "surface"); | |
| 55 sprite->depth = glGetUniformLocation(sprite->base.id, "depth"); | |
| 56 } | |
| 57 | |
| 58 static void asc_shader_destroy_predefined(AscGLContext *ctx) { | |
| 59 asc_shader_program_destroy(ctx->shader.sprite.base); | |
| 60 } | |
| 61 | |
| 62 bool asc_gl_context_initialize( | |
| 63 AscGLContext *ctx, | |
| 64 SDL_Window *window, | |
| 65 AscGLContextSettings const *settings | |
| 66 ) { | |
| 67 SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE); | |
| 68 SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, settings->gl_major_version); | |
| 69 SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, settings->gl_minor_version); | |
| 70 SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, settings->depth_size); | |
| 71 SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1); | |
| 72 ctx->glctx = SDL_GL_CreateContext(window); | |
| 73 if (ctx->glctx == NULL) return false; | |
| 74 ctx->window = window; | |
| 75 | |
| 76 glewExperimental = GL_TRUE; | |
| 77 GLenum err = glewInit(); | |
| 78 if (err == GLEW_OK) { | |
| 79 SDL_GL_SetSwapInterval(settings->vsync); | |
| 80 | |
| 81 glClearColor(0.0f, 0.0f, 0.0f, 1.0f); | |
| 82 glEnable(GL_DEBUG_OUTPUT); | |
| 83 glDebugMessageCallback(asc_gl_debug_callback, NULL); | |
| 84 | |
| 85 if (!asc_primitives_init(&ctx->primitives)) { | |
| 86 asc_error("Creating primitive meshes failed"); | |
| 87 SDL_GL_DeleteContext(ctx->glctx); | |
| 88 return false; | |
| 89 } | |
| 90 | |
| 91 asc_shader_initialize_predefined(ctx); | |
| 92 | |
| 93 return true; | |
| 94 } else { | |
| 95 asc_error(glewGetErrorString(err)); | |
| 96 SDL_GL_DeleteContext(ctx->glctx); | |
| 97 return false; | |
| 98 } | |
| 99 } | |
| 100 | |
| 101 void asc_gl_context_destroy(AscGLContext *ctx) { | |
| 102 if (ctx->glctx == NULL) return; | |
| 103 SDL_GL_MakeCurrent(ctx->window, ctx->glctx); | |
| 104 | |
| 105 asc_shader_destroy_predefined(ctx); | |
| 106 asc_primitives_destroy(&ctx->primitives); | |
| 107 | |
| 108 // destroy the GL context and the window | |
| 109 SDL_GL_DeleteContext(ctx->glctx); | |
| 110 ctx->glctx = NULL; | |
| 111 } |
