208 lines
6.6 KiB
C
208 lines
6.6 KiB
C
|
/*
|
||
|
|
* Gem-graph OpenGL experiments
|
||
|
|
*
|
||
|
|
* Desc: GL functions
|
||
|
|
*
|
||
|
|
* Copyright (C) 2023 Adrien Bourmault <neox@a-lec.org>
|
||
|
|
* Copyright (C) 2023 Jean Sirmai <jean@a-lec.org>
|
||
|
|
*
|
||
|
|
* 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 <http://www.gnu.org/licenses/>.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Writes values to describe a vertex at (x,y,z) intoq the vertex buffer
|
||
|
|
*
|
||
|
|
* @param coords GLfloat(x,y,z)
|
||
|
|
*
|
||
|
|
* @return void
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <time.h>
|
||
|
|
#include <cglm/cglm.h>
|
||
|
|
#include "../../include/base.h"
|
||
|
|
#include "../../include/ui.h"
|
||
|
|
#include "../../include/graphics.h"
|
||
|
|
|
||
|
|
void graphics_draw_vertex (const int stack_id,
|
||
|
|
GLfloat x,
|
||
|
|
GLfloat y,
|
||
|
|
GLfloat z)
|
||
|
|
{
|
||
|
|
//g_printerr("stack_id is %d\n", stack_id);
|
||
|
|
//g_printerr("stack_id is %d\n", stack_id);
|
||
|
|
//g_printerr("graphic_stack is at %p\n", graphic_stack);
|
||
|
|
//g_printerr("graphic_stack[stack_id] is at %p\n", graphic_stack + stack_id);
|
||
|
|
volatile struct graphic_stack_t *stack = &graphic_stack[stack_id];
|
||
|
|
|
||
|
|
//g_printerr("Currently stack->buffer_vertex_origin @ %p\n", stack->buffer_vertex_origin);
|
||
|
|
|
||
|
|
//assert (stack->buffer_vertex_origin);
|
||
|
|
|
||
|
|
stack->buffer_vertex_origin =
|
||
|
|
g_realloc (stack->buffer_vertex_origin,
|
||
|
|
(stack->buffer_vertex_size + 3) * sizeof(GLfloat));
|
||
|
|
//print_stack(stack_id);
|
||
|
|
|
||
|
|
stack->buffer_vertex_origin[stack->buffer_vertex_size + 0] = x;
|
||
|
|
stack->buffer_vertex_origin[stack->buffer_vertex_size + 1] = y;
|
||
|
|
stack->buffer_vertex_origin[stack->buffer_vertex_size + 2] = z;
|
||
|
|
|
||
|
|
stack->buffer_vertex_size += 3;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Writes values to describe a color (r,g,b) into the color buffer
|
||
|
|
*
|
||
|
|
* @param color GLfloat(r,g,b)
|
||
|
|
*
|
||
|
|
* @return void
|
||
|
|
*/
|
||
|
|
void graphics_draw_color (const int stack_id,
|
||
|
|
GLfloat r,
|
||
|
|
GLfloat g,
|
||
|
|
GLfloat b)
|
||
|
|
{
|
||
|
|
struct graphic_stack_t *stack = &graphic_stack[stack_id];
|
||
|
|
|
||
|
|
stack->buffer_colors_origin = g_realloc (stack->buffer_colors_origin,
|
||
|
|
(stack->buffer_colors_size + 3) * sizeof(GLfloat));
|
||
|
|
|
||
|
|
assert (stack->buffer_colors_origin);
|
||
|
|
|
||
|
|
stack->buffer_colors_origin[stack->buffer_colors_size + 0] = r;
|
||
|
|
stack->buffer_colors_origin[stack->buffer_colors_size + 1] = g;
|
||
|
|
stack->buffer_colors_origin[stack->buffer_colors_size + 2] = b;
|
||
|
|
|
||
|
|
stack->buffer_colors_size += 3;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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)
|
||
|
|
{
|
||
|
|
struct graphic_stack_t *stack = &graphic_stack[stack_id];
|
||
|
|
|
||
|
|
stack->buffer_lines_origin = g_realloc (stack->buffer_lines_origin,
|
||
|
|
(stack->buffer_lines_size + 2) * sizeof(GLuint));
|
||
|
|
|
||
|
|
assert (stack->buffer_lines_origin);
|
||
|
|
|
||
|
|
stack->buffer_lines_origin[stack->buffer_lines_size + 0] = a;
|
||
|
|
stack->buffer_lines_origin[stack->buffer_lines_size + 1] = b;
|
||
|
|
|
||
|
|
stack->buffer_lines_size += 2;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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)
|
||
|
|
{
|
||
|
|
struct graphic_stack_t *stack = &graphic_stack[stack_id];
|
||
|
|
|
||
|
|
stack->buffer_plans_origin = g_realloc (stack->buffer_plans_origin,
|
||
|
|
(stack->buffer_plans_size + 3) * sizeof(GLuint));
|
||
|
|
|
||
|
|
assert (stack->buffer_plans_origin);
|
||
|
|
|
||
|
|
stack->buffer_plans_origin[stack->buffer_plans_size + 0] = a;
|
||
|
|
stack->buffer_plans_origin[stack->buffer_plans_size + 1] = b;
|
||
|
|
stack->buffer_plans_origin[stack->buffer_plans_size + 2] = c;
|
||
|
|
|
||
|
|
stack->buffer_plans_size += 3;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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)
|
||
|
|
{
|
||
|
|
struct graphic_stack_t *stack = &graphic_stack[stack_id];
|
||
|
|
|
||
|
|
//g_printerr("[debug] graphics_draw() started\n");
|
||
|
|
|
||
|
|
//print_stack(stack_id);
|
||
|
|
|
||
|
|
GLint cur_viewport[4];
|
||
|
|
glGetIntegerv(GL_VIEWPORT, cur_viewport);
|
||
|
|
|
||
|
|
mat4 m = GLM_MAT4_IDENTITY_INIT;
|
||
|
|
glm_rotate_x(m, glm_rad(stack->rotation_angles[X_AXIS]), m);
|
||
|
|
glm_rotate_y(m, glm_rad(stack->rotation_angles[Y_AXIS]), m);
|
||
|
|
glm_rotate_z(m, glm_rad(stack->rotation_angles[Z_AXIS]), m);
|
||
|
|
|
||
|
|
mat4 v = GLM_MAT4_IDENTITY_INIT; // XXX define zoom and translations here ?
|
||
|
|
|
||
|
|
mat4 p = GLM_MAT4_IDENTITY_INIT;
|
||
|
|
//glm_ortho(-1.0f, +1.0f, -1.0f, +1.0f, -1.0f, +1.0f, p);
|
||
|
|
glm_ortho_default((float)cur_viewport[2] / (float)cur_viewport[3], p);
|
||
|
|
//glm_perspective_default((float)cur_viewport[2] / (float)cur_viewport[3], p);
|
||
|
|
|
||
|
|
/* Use our shaders */
|
||
|
|
glUseProgram(stack->program);
|
||
|
|
|
||
|
|
glClearColor(0, 0, 0, 1);
|
||
|
|
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
||
|
|
|
||
|
|
/* Update the "mvp" matrix we use in the shader */
|
||
|
|
glUniformMatrix4fv(stack->m, 1, GL_FALSE, (float *)m);
|
||
|
|
glUniformMatrix4fv(stack->v, 1, GL_FALSE, (float *)v);
|
||
|
|
glUniformMatrix4fv(stack->p, 1, GL_FALSE, (float *)p);
|
||
|
|
|
||
|
|
/* Use the vertices in our buffer */
|
||
|
|
glEnableVertexAttribArray(0);
|
||
|
|
glBindBuffer(GL_ARRAY_BUFFER, stack->position_buffer);
|
||
|
|
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0,(void*)0);
|
||
|
|
|
||
|
|
// couleurs
|
||
|
|
glEnableVertexAttribArray(1);
|
||
|
|
glBindBuffer(GL_ARRAY_BUFFER, stack->color_buffer);
|
||
|
|
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0,(void*)0);
|
||
|
|
|
||
|
|
//glEnable(GL_DEPTH_TEST);
|
||
|
|
|
||
|
|
glDrawElements(GL_LINES, stack->buffer_lines_size, GL_UNSIGNED_INT, stack->buffer_lines_origin);
|
||
|
|
glDrawElements(GL_TRIANGLES, stack->buffer_plans_size, GL_UNSIGNED_INT, stack->buffer_plans_origin);
|
||
|
|
|
||
|
|
/* We finished using the buffers and program */
|
||
|
|
glDisableVertexAttribArray(0);
|
||
|
|
glDisableVertexAttribArray(1);
|
||
|
|
glBindBuffer(GL_ARRAY_BUFFER, 0);
|
||
|
|
glUseProgram(0);
|
||
|
|
|
||
|
|
glFlush();
|
||
|
|
//g_printerr("[debug] graphics_draw() ended\n");
|
||
|
|
}
|