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/*
* Copyright © 2020 Google, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sub license,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#define _GNU_SOURCE
#include <assert.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <GLES3/gl3.h>
#include "common.h"
#include "esUtil.h"
static struct {
struct egl egl;
const struct gbm *gbm;
/* Shadertoy rendering (to FBO): */
GLuint stoy_program;
GLuint stoy_fbo, stoy_fbotex;
GLint stoy_time_loc;
GLuint stoy_vbo;
/* Cube rendering (textures from FBO): */
GLfloat aspect;
GLuint program;
/* uniform handles: */
GLint modelviewmatrix, modelviewprojectionmatrix, normalmatrix;
GLint texture;
GLuint vbo;
GLuint positionsoffset, texcoordsoffset, normalsoffset;
GLuint tex[2];
} gl;
static const GLfloat vVertices[] = {
// front
-1.0f, -1.0f, +1.0f,
+1.0f, -1.0f, +1.0f,
-1.0f, +1.0f, +1.0f,
+1.0f, +1.0f, +1.0f,
// back
+1.0f, -1.0f, -1.0f,
-1.0f, -1.0f, -1.0f,
+1.0f, +1.0f, -1.0f,
-1.0f, +1.0f, -1.0f,
// right
+1.0f, -1.0f, +1.0f,
+1.0f, -1.0f, -1.0f,
+1.0f, +1.0f, +1.0f,
+1.0f, +1.0f, -1.0f,
// left
-1.0f, -1.0f, -1.0f,
-1.0f, -1.0f, +1.0f,
-1.0f, +1.0f, -1.0f,
-1.0f, +1.0f, +1.0f,
// top
-1.0f, +1.0f, +1.0f,
+1.0f, +1.0f, +1.0f,
-1.0f, +1.0f, -1.0f,
+1.0f, +1.0f, -1.0f,
// bottom
-1.0f, -1.0f, -1.0f,
+1.0f, -1.0f, -1.0f,
-1.0f, -1.0f, +1.0f,
+1.0f, -1.0f, +1.0f,
};
static const GLfloat vTexCoords[] = {
//front
1.0f, 1.0f,
0.0f, 1.0f,
1.0f, 0.0f,
0.0f, 0.0f,
//back
1.0f, 1.0f,
0.0f, 1.0f,
1.0f, 0.0f,
0.0f, 0.0f,
//right
1.0f, 1.0f,
0.0f, 1.0f,
1.0f, 0.0f,
0.0f, 0.0f,
//left
1.0f, 1.0f,
0.0f, 1.0f,
1.0f, 0.0f,
0.0f, 0.0f,
//top
1.0f, 1.0f,
0.0f, 1.0f,
1.0f, 0.0f,
0.0f, 0.0f,
//bottom
1.0f, 0.0f,
0.0f, 0.0f,
1.0f, 1.0f,
0.0f, 1.0f,
};
static const GLfloat vNormals[] = {
// front
+0.0f, +0.0f, +1.0f, // forward
+0.0f, +0.0f, +1.0f, // forward
+0.0f, +0.0f, +1.0f, // forward
+0.0f, +0.0f, +1.0f, // forward
// back
+0.0f, +0.0f, -1.0f, // backward
+0.0f, +0.0f, -1.0f, // backward
+0.0f, +0.0f, -1.0f, // backward
+0.0f, +0.0f, -1.0f, // backward
// right
+1.0f, +0.0f, +0.0f, // right
+1.0f, +0.0f, +0.0f, // right
+1.0f, +0.0f, +0.0f, // right
+1.0f, +0.0f, +0.0f, // right
// left
-1.0f, +0.0f, +0.0f, // left
-1.0f, +0.0f, +0.0f, // left
-1.0f, +0.0f, +0.0f, // left
-1.0f, +0.0f, +0.0f, // left
// top
+0.0f, +1.0f, +0.0f, // up
+0.0f, +1.0f, +0.0f, // up
+0.0f, +1.0f, +0.0f, // up
+0.0f, +1.0f, +0.0f, // up
// bottom
+0.0f, -1.0f, +0.0f, // down
+0.0f, -1.0f, +0.0f, // down
+0.0f, -1.0f, +0.0f, // down
+0.0f, -1.0f, +0.0f // down
};
static const char *cube_vs =
"uniform mat4 modelviewMatrix; \n"
"uniform mat4 modelviewprojectionMatrix;\n"
"uniform mat3 normalMatrix; \n"
" \n"
"attribute vec4 in_position; \n"
"attribute vec3 in_normal; \n"
"attribute vec2 in_TexCoord; \n"
" \n"
"vec4 lightSource = vec4(2.0, 2.0, 20.0, 0.0);\n"
" \n"
"varying vec4 vVaryingColor; \n"
"varying vec2 vTexCoord; \n"
" \n"
"void main() \n"
"{ \n"
" gl_Position = modelviewprojectionMatrix * in_position;\n"
" vec3 vEyeNormal = normalMatrix * in_normal;\n"
" vec4 vPosition4 = modelviewMatrix * in_position;\n"
" vec3 vPosition3 = vPosition4.xyz / vPosition4.w;\n"
" vec3 vLightDir = normalize(lightSource.xyz - vPosition3);\n"
" float diff = max(0.0, dot(vEyeNormal, vLightDir));\n"
" vVaryingColor = vec4(diff * vec3(1.0, 1.0, 1.0), 1.0);\n"
" vTexCoord = in_TexCoord; \n"
"} \n";
static const char *cube_fs =
"precision mediump float; \n"
" \n"
"uniform sampler2D uTex; \n"
" \n"
"varying vec4 vVaryingColor; \n"
"varying vec2 vTexCoord; \n"
" \n"
"void main() \n"
"{ \n"
" gl_FragColor = vVaryingColor * texture2D(uTex, vTexCoord);\n"
"} \n";
static const char *shadertoy_vs =
"attribute vec3 position; \n"
"void main() \n"
"{ \n"
" gl_Position = vec4(position, 1.0);\n"
"} \n";
static const char *shadertoy_fs_tmpl =
"precision mediump float; \n"
"uniform vec3 iResolution; // viewport resolution (in pixels) \n"
"uniform float iGlobalTime; // shader playback time (in seconds) \n"
"uniform vec4 iMouse; // mouse pixel coords \n"
"uniform vec4 iDate; // (year, month, day, time in seconds) \n"
"uniform float iSampleRate; // sound sample rate (i.e., 44100) \n"
"uniform vec3 iChannelResolution[4]; // channel resolution (in pixels) \n"
"uniform float iChannelTime[4]; // channel playback time (in sec) \n"
"uniform float iTime; \n"
" \n"
"%s \n"
" \n"
"void main() \n"
"{ \n"
" mainImage(gl_FragColor, gl_FragCoord.xy); \n"
"} \n";
static const uint32_t texw = 512, texh = 512;
static int load_shader(const char *file)
{
struct stat statbuf;
char *frag;
int fd, ret;
/* load src file: */
fd = open(file, 0);
if (fd < 0) {
err(fd, "could not open '%s'", file);
}
ret = fstat(fd, &statbuf);
if (ret < 0) {
err(ret, "could not stat '%s'", file);
}
const char *text =
mmap(NULL, statbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
asprintf(&frag, shadertoy_fs_tmpl, text);
return create_program(shadertoy_vs, frag);
}
static int init_shadertoy(const char *file)
{
int ret = load_shader(file);
gl.stoy_program = ret;
glBindAttribLocation(gl.program, 0, "position");
ret = link_program(gl.stoy_program);
glUseProgram(gl.stoy_program);
gl.stoy_time_loc = glGetUniformLocation(gl.stoy_program, "iTime");
/* we can set iResolution a single time, it doesn't change: */
GLint resolution_location = glGetUniformLocation(gl.stoy_program, "iResolution");
glUniform3f(resolution_location, texw, texh, 0);
glGenFramebuffers(1, &gl.stoy_fbo);
glGenTextures(1, &gl.stoy_fbotex);
glBindFramebuffer(GL_FRAMEBUFFER, gl.stoy_fbo);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, gl.stoy_fbotex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, texw, texh, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
gl.stoy_fbotex, 0);
const GLfloat vertices[] = {
-1.0f, -1.0f, 0.0f,
1.0f, -1.0f, 0.0f,
-1.0f, 1.0f, 0.0f,
1.0f, 1.0f, 0.0f,
};
glGenBuffers(1, &gl.stoy_vbo);
glBindBuffer(GL_ARRAY_BUFFER, gl.stoy_vbo);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), 0, GL_STATIC_DRAW);
glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertices), &vertices[0]);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (const GLvoid *)(intptr_t)0);
return 0;
}
static void draw_shadertoy(unsigned i)
{
GLenum mrt_bufs[] = {GL_COLOR_ATTACHMENT0};
glBindFramebuffer(GL_FRAMEBUFFER, gl.stoy_fbo);
glViewport(0, 0, texw, texh);
glUseProgram(gl.stoy_program);
glUniform1f(gl.stoy_time_loc, (float)i / 60.0f);
glBindBuffer(GL_ARRAY_BUFFER, gl.stoy_vbo);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (const GLvoid *)(intptr_t)0);
glEnableVertexAttribArray(0);
glDrawBuffers(1, mrt_bufs);
start_perfcntrs();
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
end_perfcntrs();
glDisableVertexAttribArray(0);
/* switch back to back buffer: */
glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
static void draw_cube_shadertoy(unsigned i)
{
ESMatrix modelview;
draw_shadertoy(i);
glViewport(0, 0, gl.gbm->width, gl.gbm->height);
glEnable(GL_CULL_FACE);
/* clear the color buffer */
glClearColor(0.5, 0.5, 0.5, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
glUseProgram(gl.program);
esMatrixLoadIdentity(&modelview);
esTranslate(&modelview, 0.0f, 0.0f, -8.0f);
esRotate(&modelview, 45.0f + (0.25f * i), 1.0f, 0.0f, 0.0f);
esRotate(&modelview, 45.0f - (0.5f * i), 0.0f, 1.0f, 0.0f);
esRotate(&modelview, 10.0f + (0.15f * i), 0.0f, 0.0f, 1.0f);
ESMatrix projection;
esMatrixLoadIdentity(&projection);
esFrustum(&projection, -2.8f, +2.8f, -2.8f * gl.aspect, +2.8f * gl.aspect, 6.0f, 10.0f);
ESMatrix modelviewprojection;
esMatrixLoadIdentity(&modelviewprojection);
esMatrixMultiply(&modelviewprojection, &modelview, &projection);
float normal[9];
normal[0] = modelview.m[0][0];
normal[1] = modelview.m[0][1];
normal[2] = modelview.m[0][2];
normal[3] = modelview.m[1][0];
normal[4] = modelview.m[1][1];
normal[5] = modelview.m[1][2];
normal[6] = modelview.m[2][0];
normal[7] = modelview.m[2][1];
normal[8] = modelview.m[2][2];
glUniformMatrix4fv(gl.modelviewmatrix, 1, GL_FALSE, &modelview.m[0][0]);
glUniformMatrix4fv(gl.modelviewprojectionmatrix, 1, GL_FALSE, &modelviewprojection.m[0][0]);
glUniformMatrix3fv(gl.normalmatrix, 1, GL_FALSE, normal);
glBindBuffer(GL_ARRAY_BUFFER, gl.vbo);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (const GLvoid *)(intptr_t)gl.positionsoffset);
glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0, (const GLvoid *)(intptr_t)gl.normalsoffset);
glEnableVertexAttribArray(1);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 0, (const GLvoid *)(intptr_t)gl.texcoordsoffset);
glEnableVertexAttribArray(2);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, gl.stoy_fbotex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_REPEAT);
glUniform1i(gl.texture, 0); /* '0' refers to texture unit 0. */
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glDrawArrays(GL_TRIANGLE_STRIP, 4, 4);
glDrawArrays(GL_TRIANGLE_STRIP, 8, 4);
glDrawArrays(GL_TRIANGLE_STRIP, 12, 4);
glDrawArrays(GL_TRIANGLE_STRIP, 16, 4);
glDrawArrays(GL_TRIANGLE_STRIP, 20, 4);
glDisableVertexAttribArray(0);
glDisableVertexAttribArray(1);
glDisableVertexAttribArray(2);
}
const struct egl * init_cube_shadertoy(const struct gbm *gbm, const char *file, int samples)
{
int ret;
ret = init_egl(&gl.egl, gbm, samples);
if (ret)
return NULL;
gl.aspect = (GLfloat)(gbm->height) / (GLfloat)(gbm->width);
gl.gbm = gbm;
ret = create_program(cube_vs, cube_fs);
if (ret < 0)
return NULL;
gl.program = ret;
glBindAttribLocation(gl.program, 0, "in_position");
glBindAttribLocation(gl.program, 1, "in_normal");
glBindAttribLocation(gl.program, 2, "in_color");
ret = link_program(gl.program);
if (ret)
return NULL;
glUseProgram(gl.program);
gl.modelviewmatrix = glGetUniformLocation(gl.program, "modelviewMatrix");
gl.modelviewprojectionmatrix = glGetUniformLocation(gl.program, "modelviewprojectionMatrix");
gl.normalmatrix = glGetUniformLocation(gl.program, "normalMatrix");
gl.texture = glGetUniformLocation(gl.program, "uTex");
glViewport(0, 0, gbm->width, gbm->height);
glEnable(GL_CULL_FACE);
gl.positionsoffset = 0;
gl.texcoordsoffset = sizeof(vVertices);
gl.normalsoffset = sizeof(vVertices) + sizeof(vTexCoords);
glGenBuffers(1, &gl.vbo);
glBindBuffer(GL_ARRAY_BUFFER, gl.vbo);
glBufferData(GL_ARRAY_BUFFER, sizeof(vVertices) + sizeof(vTexCoords) + sizeof(vNormals), 0, GL_STATIC_DRAW);
glBufferSubData(GL_ARRAY_BUFFER, gl.positionsoffset, sizeof(vVertices), &vVertices[0]);
glBufferSubData(GL_ARRAY_BUFFER, gl.texcoordsoffset, sizeof(vTexCoords), &vTexCoords[0]);
glBufferSubData(GL_ARRAY_BUFFER, gl.normalsoffset, sizeof(vNormals), &vNormals[0]);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (const GLvoid *)(intptr_t)gl.positionsoffset);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0, (const GLvoid *)(intptr_t)gl.normalsoffset);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 0, (const GLvoid *)(intptr_t)gl.texcoordsoffset);
ret = init_shadertoy(file);
if (ret) {
printf("failed to initialize\n");
return NULL;
}
gl.egl.draw = draw_cube_shadertoy;
return &gl.egl;
}
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