/* * Gem-graph OpenGL experiments * * Desc: OpenGL utils header * * Copyright (C) 2023 Arthur Menges * Copyright (C) 2023 Adrien Bourmault * Copyright (C) 2023 Jean Sirmai * * This file is part of Gem-graph. * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see . */ #pragma once #include "base.h" #include #include #include #include #include #define VERTEX_SHADER_FILE "src/graphics/shaders/shader.vert" #define FRAG_SHADER_FILE "src/graphics/shaders/shader.frag" /* * Structure describing a gl_area and its parameters, used to create a table * of Gem-graph client current gl_areas */ struct graphic_stack_t { int id; int mode; void *glarea; GLuint vao; // init_buffers GLuint position_buffer; // shutdown, draw GLuint color_buffer; // shutdown, draw GLuint program; // shutdown, init_shaders, draw GLuint m; // init_shaders, draw GLuint v; // init_shaders, draw GLuint p; // init_shaders, draw struct arrow_t *arrows_ptr; long arrows_nb; GLfloat *buffer_vertex_origin; GLfloat *buffer_colors_origin; GLuint *buffer_lines_origin; GLuint *buffer_plans_origin; long buffer_vertex_size; long buffer_colors_size; long buffer_lines_size; long buffer_plans_size; long buffer_vertex_0_arrow; long buffer_colors_0_arrow; long buffer_lines_0_arrow; long buffer_plans_0_arrow; }; /* * Dynamic array of ptrs to dynamically allocated gl_area_entry */ extern struct graphic_stack_t *graphic_stack; /* * Initializes a gl_area * * @param gl_area, ptr to the gl_area widget * * @return true if initialized */ int graphics_init(void *glarea); /* * Draws the current buffer to a gl_area * * @param gl_area, ptr to the gl_area widget * * @return void */ void graphics_draw(const int stack_id); /* * Shutdowns a gl_area * * @param gl_area, ptr to the gl_area widget * * @return true if success */ bool graphics_shutdown(const int stack_id); /* * Initializes the shaders of a gl_area and link them to a program * * @param gl_area, ptr to the gl_area widget * * @return true if initialized */ bool graphics_init_shaders(const int stack_id); /* Initializes the buffer of a gl_area * Calls according to the user preferences * @param gl_area, ptr to the gl_area widget * @return void */ void graphics_init_buffers(const int stack_id); /* * Draws a vertex (x, y, z) * if (console) prints (x, y, z) values to console * * @param GLfloat x, GLfloat y, GLfloat z * * @return void */ void graphics_draw_vertex (const int stack_id, GLfloat x, GLfloat y, GLfloat z); /* * Draws the color (r, g, b) associated to a vertex * if (console) prints (r, g, b) values to console * * @param GLfloat r, GLfloat g, GLfloat b * * @return void */ void graphics_draw_color (const int stack_id, GLfloat r, GLfloat g, GLfloat b); /* * Writes values to describe a line from a to b into the line buffer * * @param coords GLuint (a,b) * * @return void */ void graphics_draw_line (const int stack_id, GLuint a, GLuint b); /* * Writes values to describe an (a,b,c) plan (triangle) into the plan buffer * * @param coords GLuint (a,b,c) * * @return void */ void graphics_draw_plan (const int stack_id, GLuint a, GLuint b, GLuint c); /* * Initializes an identity matrix * * @param res, target ptr * * @return void */ static inline void compute_i(float *res) { /* initialize to the identity matrix */ res[0] = 1.f; res[4] = 0.f; res[8] = 0.f; res[12] = 0.f; res[1] = 0.f; res[5] = 1.f; res[9] = 0.f; res[13] = 0.f; res[2] = 0.f; res[6] = 0.f; res[10] = 1.f; res[14] = 0.f; res[3] = 0.f; res[7] = 0.f; res[11] = 0.f; res[15] = 1.f; } /* * Computes the projection matrix * * @param res, target ptr * phi, XXX * theta, XXX * psi, XXX * * @return void */ static inline void compute_mvp(float *res, float phi, float theta, float psi) { float x = phi *(G_PI / 180.f); float y = theta *(G_PI / 180.f); float z = psi *(G_PI / 180.f); float c1 = cosf(x), s1 = sinf(x); float c2 = cosf(y), s2 = sinf(y); float c3 = cosf(z), s3 = sinf(z); float c3c2 = c3 * c2; float s3c1 = s3 * c1; float c3s2s1 = c3 * s2 * s1; float s3s1 = s3 * s1; float c3s2c1 = c3 * s2 * c1; float s3c2 = s3 * c2; float c3c1 = c3 * c1; float s3s2s1 = s3 * s2 * s1; float c3s1 = c3 * s1; float s3s2c1 = s3 * s2 * c1; float c2s1 = c2 * s1; float c2c1 = c2 * c1; compute_i(res); /* apply all three rotations using the three matrices: * * ⎡ c3 s3 0 ⎤ ⎡ c2 0 -s2 ⎤ ⎡ 1 0 0 ⎤ * ⎢ -s3 c3 0 ⎥ ⎢ 0 1 0 ⎥ ⎢ 0 c1 s1 ⎥ * ⎣ 0 0 1 ⎦ ⎣ s2 0 c2 ⎦ ⎣ 0 -s1 c1 ⎦ */ res[0] = c3c2; res[4] = s3c1 + c3s2s1; res[8] = s3s1 - c3s2c1; res[12] = 0.f; res[1] = -s3c2; res[5] = c3c1 - s3s2s1; res[9] = c3s1 + s3s2c1; res[13] = 0.f; res[2] = s2; res[6] = -c2s1; res[10] = c2c1; res[14] = 0.f; res[3] = 0.f; res[7] = 0.f; res[11] = 0.f; res[15] = 1.f; } /* * Created and compile a shader * * @param type, shader type * src, source code of shader * * @return shader id */ static inline GLuint create_shader(const int stack_id, int type, const char *src) { GLuint shader; int status; shader = glCreateShader(type); glShaderSource(shader, 1, &src, NULL); glCompileShader(shader); glGetShaderiv(shader, GL_COMPILE_STATUS, &status); if(status == GL_FALSE) { int log_len; char *buffer; glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &log_len); buffer = g_malloc(log_len + 1); assert (buffer); glGetShaderInfoLog(shader, log_len, NULL, buffer); g_warning("Compile failure in %s shader:\n%s", type == GL_VERTEX_SHADER ? "vertex" : "fragment", buffer); g_free(buffer); glDeleteShader(shader); return 0; } return shader; } /*** TEST ***/ void main_test_graphics (const int stack_id); /* * Structure describing an arrow */ struct arrow_t { GLuint load; GLuint site; GLuint x; GLuint y; GLuint z; }; int draw_one_arrow_vertex (const int stack_id, int space_X, int space_Y, int space_Z, int weight, int site, int x, int y, int z); int draw_one_arrow_line(const int stack_id, int offset_vertex); /* * Writes grid ridges to vertex and color buffers * * @param coords long (x,y,z), step_x, step_y, step_z * * @return void */ int draw_space_ridges_vertex (const int stack_id, long offset_vertex, long x, long y, long z); int draw_space_ridges_lines (const int stack_id); /* * Writes grid lines on space faces * * @param coords long (x,y,z) * * @return void */ long draw_grids_on_space_faces_vertex (const int stack_id, long x, long y, long z); long draw_grids_on_space_faces_lines (const int stack_id, long offset_vertex, long x, long y, long z); int set_arrow (int stack_id, int arrows_nb, int space_X, int space_Y, int space_Z, int requested_weight, int site, int arrow_x, int arrow_y, int arrow_z);