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/*
* demoscene-eo, an ASCII art demoscene written as a gift for Emmanuel Otton retirement
* Copyright (C) 2019 XXXXXX XXXXXXX <xxxxxx@xxxxxx.fr>
*
* This file is part of demoscene-eo.
*
* demoscene-eo is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* demoscene-eo 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with demoscene-eo. If not, see <http://www.gnu.org/licenses/>
*/
#include "scene01.h"
#include "utils.h"
// Mostly inspired by CC0 https://gist.github.com/koute/7391344
typedef enum t_attrib_id
{
attrib_position,
attrib_color
} t_attrib_id;
int scene01_init_gl(graphical_env_t *ge, scene01_env_t *se) {
GLuint vs, fs, program, vbo, renderedTexture, depthrenderbuffer;
GLint status;
GLenum DrawBuffers[1] = {GL_COLOR_ATTACHMENT0};
TRACE("call");
vs = glCreateShader(GL_VERTEX_SHADER);
status = gl_compile_shader_from_file(vs, "res/scene01_vs_basic.glsl"); if (status) return 40+status;
fs = glCreateShader(GL_FRAGMENT_SHADER);
status = gl_compile_shader_from_file(fs, "res/scene01_fs_colorfultest.glsl"); if (status) return 50+status;
program = glCreateProgram();
glAttachShader(program, vs);
glAttachShader(program, fs);
glBindAttribLocation(program, attrib_position, "i_position");
glBindAttribLocation(program, attrib_color, "i_color");
glLinkProgram(program);
glGetProgramiv(program, GL_LINK_STATUS, &status);
glDetachShader(program, vs);
glDetachShader(program, fs);
glDeleteShader(vs);
glDeleteShader(fs);
if(status == GL_FALSE) {
gl_trace_shader_or_program_log(program);
return 60;
}
glUseProgram(program);
// http://www.opengl-tutorial.org/intermediate-tutorials/tutorial-14-render-to-texture/
// The framebuffer, which regroups 0, 1, or more textures, and 0 or 1 depth buffer.
glGenFramebuffers(1, &ge->gl_fbo);
// The texture we're going to render to
glGenTextures(1, &renderedTexture);
// "Bind" the newly created texture : all future texture functions will modify this texture
glBindTexture(GL_TEXTURE_2D, renderedTexture);
// Give an empty image to OpenGL ( the last "0" )
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, FBUF_W, FBUF_H, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
// Poor filtering. Needed !
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
// The depth buffer
glGenRenderbuffers(1, &depthrenderbuffer);
glBindRenderbuffer(GL_RENDERBUFFER, depthrenderbuffer);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, FBUF_W, FBUF_H);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depthrenderbuffer);
// Set "renderedTexture" as our colour attachement #0
glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, renderedTexture, 0);
// Set the list of draw buffers.
glDrawBuffers(1, DrawBuffers); // "1" is the size of DrawBuffers
// Always check that our framebuffer is ok
if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
return 1;
}
glDisable(GL_DEPTH_TEST);
//glClearColor(0.5, 0.0, 0.0, 0.0);
glViewport(0, 0, FBUF_W, FBUF_H);
glGenVertexArrays(1, &(se->vao));
glGenBuffers(1, &vbo);
glBindVertexArray(se->vao);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glEnableVertexAttribArray(attrib_position);
glEnableVertexAttribArray(attrib_color);
glVertexAttribPointer(attrib_color, 4, GL_FLOAT, GL_FALSE, sizeof(float)*6, 0);
glVertexAttribPointer(attrib_position, 2, GL_FLOAT, GL_FALSE, sizeof(float)*6, (void *)(4*sizeof(float)));
const GLfloat g_vertex_buffer_data[] = {
/* R, G, B, A, X, Y */
1, 0, 0, 1, 0, 0,
0, 1, 0, 1, FBUF_W, 0,
0, 0, 1, 1, FBUF_W, FBUF_H,
1, 0, 0, 1, 0, 0,
0, 0, 1, 1, FBUF_W, FBUF_H,
1, 1, 1, 1, 0, FBUF_H
};
glBufferData(GL_ARRAY_BUFFER, sizeof(g_vertex_buffer_data), g_vertex_buffer_data, GL_STATIC_DRAW);
t_mat4x4 projection_matrix;
gl_mat4x4_ortho(projection_matrix, 0.0f, (float)FBUF_W, (float)FBUF_H, 0.0f, 0.0f, 100.0f);
glUniformMatrix4fv(glGetUniformLocation(program, "u_projection_matrix"), 1, GL_FALSE, projection_matrix);
return 0;
}
int scene01_init_sdl(graphical_env_t *ge, scene01_env_t *se) {
TRACE("call");
return 0;
}
int scene01_init_caca(graphical_env_t *ge, scene01_env_t *se) {
TRACE("call");
return 0;
}
void scene01_free_gl(graphical_env_t *ge, scene01_env_t *se) {
TRACE("call");
//TODO
}
void scene01_free_sdl(graphical_env_t *ge, scene01_env_t *se) {
TRACE("call");
}
void scene01_free_caca(graphical_env_t *ge, scene01_env_t *se) {
TRACE("call");
}
int scene01_next_gl(graphical_env_t *ge, scene01_env_t *se) {
TRACE_CALL_ONCE;
// Render to the in-VRAM Framebuffer Object
glBindFramebuffer(GL_FRAMEBUFFER, ge->gl_fbo);
glClear(GL_COLOR_BUFFER_BIT);
glBindVertexArray(se->vao);
glDrawArrays(GL_TRIANGLES, 0, 6);
// [...]
// Render to the screen
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glClear(GL_COLOR_BUFFER_BIT);
glBindVertexArray(se->vao);
glDrawArrays(GL_TRIANGLES, 0, 6);
SDL_GL_SwapWindow(ge->gl_win);
// Download the rendered texture from videocard to main memory
//SDL_RenderReadPixels(r, NULL, 0, ge->raw_target, FBUF_W*4);
return 0;
}
int scene01_next_sdl(graphical_env_t *ge, scene01_env_t *se) {
TRACE_CALL_ONCE;
return 0;
}
int scene01_next_caca(graphical_env_t *ge, scene01_env_t *se) {
// Shorthands
caca_canvas_t *cv = ge->cv;
int w = ge->w, h = ge->h;
Uint32 frame = ge->sc_framecount;
TRACE_CALL_ONCE;
// "convert" the raw pixel stream from SDL to ASCII art on caca canevas
caca_set_dither_gamma(ge->d, 1.0);
caca_dither_bitmap(cv, 0, 0, w, h, ge->d, ge->raw_target);
// Add things on top of caca canvas
caca_set_color_ansi(cv, CACA_WHITE, CACA_BLACK);
caca_put_str(cv, (w-17)/2, h/2, "This is a message");
if (frame >= 300) {
return 1;
}
return 0;
}
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