111 lines
2.6 KiB
C
111 lines
2.6 KiB
C
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/*
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* Gem-graph OpenGL experiments
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*
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* Desc: OpenGL utils header
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*
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* Copyright (C) 2023 Jean Sirmai <jean@a-lec.org>
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*
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* This file is part of Gem-graph.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "base.h"
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#include <unistd.h>
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#include <stdbool.h>
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#include <epoxy/gl.h>
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#include <GL/glu.h>
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#include <GL/glext.h>
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/*
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* Initializes the shaders of a gl_area and link them to a program
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*
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* @param gl_area, ptr to the gl_area widget
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*
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* @return true if initialized
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*/
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bool graphics_init_shaders(const void *gl_area);
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/*
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* Created and compile a shader
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*
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* @param type, shader type
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* src, source code of shader
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*
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* @return shader id
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*/
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static inline GLuint create_shader(int type, const char *src)
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{
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GLuint shader;
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int status;
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shader = glCreateShader(type);
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glShaderSource(shader, 1, &src, NULL);
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glCompileShader(shader);
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glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
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if(status == GL_FALSE) {
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int log_len;
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char *buffer;
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glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &log_len);
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buffer = g_malloc(log_len + 1);
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assert (buffer);
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glGetShaderInfoLog(shader, log_len, NULL, buffer);
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g_warning("Compile failure in %s shader:\n%s",
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type == GL_VERTEX_SHADER ? "vertex" : "fragment",
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buffer);
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g_free(buffer);
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glDeleteShader(shader);
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return 0;
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}
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return shader;
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}
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/*
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* Find the gl_area_entry size
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*
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* @param void
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*
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* @return size of array
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*/
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// extern struct gl_area_entry **gl_area_array;
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// static inline short gl_area_size(void)
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// {
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// struct gl_area_entry **cur;
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// short size;
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// Check uninitialized and quit
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// if (gl_area_array == NULL) return 0;
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// cur = gl_area_array;
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// while(*cur) {
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// cur++;
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// size++;
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// }
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// return size;
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// }
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/*** TEST ***/
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// void main_test_graphics (void);
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