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Nuklear/demo/linuxgl/linuxgl.c
vurtun 4a49bfe64f updated opengl demos
2016-01-14 15:25:35 +01:00

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/*
Copyright (c) 2016 Micha Mettke
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <math.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <GL/gl.h>
#include <GL/glx.h>
#include <GL/glext.h>
#include <GL/glxext.h>
#ifndef FALSE
#define FALSE 0
#endif
#ifndef TRUE
#define TRUE 1
#endif
#include "../../zahnrad.h"
#include "../demo.c"
/* prefered OpenGL version */
#define OGL_MAJOR_VERSION 3
#define OGL_MINOR_VERSION 0
#define MAX_VERTEX_MEMORY 512 * 1024
#define MAX_ELEMENT_MEMORY 128 * 1024
#define UNUSED(a) ((void)(a))
typedef GLXContext(*glxCreateContext)(Display*, GLXFBConfig, GLXContext, Bool, const int*);
/* GL_ARB_vertex_buffer_object */
typedef void(*qglGenBuffers)(GLsizei, GLuint*);
typedef void(*qglBindBuffer)(GLenum, GLuint);
typedef void(*qglBufferData)(GLenum, GLsizeiptr, const GLvoid*, GLenum);
typedef void(*qglBufferSubData)(GLenum, GLintptr, GLsizeiptr, const GLvoid*);
typedef void*(*qglMapBuffer)(GLenum, GLenum);
typedef GLboolean(*qglUnmapBuffer)(GLenum);
typedef void(*qglDeleteBuffers)(GLsizei, GLuint*);
/* GL_ARB_vertex_array_object */
typedef void (*qglGenVertexArrays)(GLsizei, GLuint*);
typedef void (*qglBindVertexArray)(GLuint);
typedef void (*qglDeleteVertexArrays)(GLsizei, const GLuint*);
/* GL_ARB_vertex_program / GL_ARB_fragment_program */
typedef void(*qglVertexAttribPointer)(GLuint, GLint, GLenum, GLboolean, GLsizei, const GLvoid*);
typedef void(*qglEnableVertexAttribArray)(GLuint);
typedef void(*qglDisableVertexAttribArray)(GLuint);
/* GLSL/OpenGL 2.0 core */
typedef GLuint(*qglCreateShader)(GLenum);
typedef void(*qglShaderSource)(GLuint, GLsizei, const GLchar**, const GLint*);
typedef void(*qglCompileShader)(GLuint);
typedef void(*qglGetShaderiv)(GLuint, GLenum, GLint*);
typedef void(*qglGetShaderInfoLog)(GLuint, GLsizei, GLsizei*, GLchar*);
typedef void(*qglDeleteShader)(GLuint);
typedef GLuint(*qglCreateProgram)(void);
typedef void(*qglAttachShader)(GLuint, GLuint);
typedef void(*qglDetachShader)(GLuint, GLuint);
typedef void(*qglLinkProgram)(GLuint);
typedef void(*qglUseProgram)(GLuint);
typedef void(*qglGetProgramiv)(GLuint, GLenum, GLint*);
typedef void(*qglGetProgramInfoLog)(GLuint, GLsizei, GLsizei*, GLchar*);
typedef void(*qglDeleteProgram)(GLuint);
typedef GLint(*qglGetUniformLocation)(GLuint, const GLchar*);
typedef GLint(*qglGetAttribLocation)(GLuint, const GLchar*);
typedef void(*qglUniform1i)(GLint, GLint);
typedef void(*qglUniform1f)(GLint, GLfloat);
typedef void(*qglUniformMatrix3fv)(GLint, GLsizei, GLboolean, const GLfloat*);
typedef void(*qglUniformMatrix4fv)(GLint, GLsizei, GLboolean, const GLfloat*);
static qglGenBuffers glGenBuffers;
static qglBindBuffer glBindBuffer;
static qglBufferData glBufferData;
static qglBufferSubData glBufferSubData;
static qglMapBuffer glMapBuffer;
static qglUnmapBuffer glUnmapBuffer;
static qglDeleteBuffers glDeleteBuffers;
static qglGenVertexArrays glGenVertexArrays;
static qglBindVertexArray glBindVertexArray;
static qglDeleteVertexArrays glDeleteVertexArrays;
static qglVertexAttribPointer glVertexAttribPointer;
static qglEnableVertexAttribArray glEnableVertexAttribArray;
static qglDisableVertexAttribArray glDisableVertexAttribArray;
static qglCreateShader glCreateShader;
static qglShaderSource glShaderSource;
static qglCompileShader glCompileShader;
static qglGetShaderiv glGetShaderiv;
static qglGetShaderInfoLog glGetShaderInfoLog;
static qglDeleteShader glDeleteShader;
static qglCreateProgram glCreateProgram;
static qglAttachShader glAttachShader;
static qglDetachShader glDetachShader;
static qglLinkProgram glLinkProgram;
static qglUseProgram glUseProgram;
static qglGetProgramiv glGetProgramiv;
static qglGetProgramInfoLog glGetProgramInfoLog;
static qglDeleteProgram glDeleteProgram;
static qglGetUniformLocation glGetUniformLocation;
static qglGetAttribLocation glGetAttribLocation;
static qglUniform1i glUniform1i;
static qglUniform1f glUniform1f;
static qglUniformMatrix3fv glUniformMatrix3fv;
static qglUniformMatrix4fv glUniformMatrix4fv;
enum graphics_card_vendors {
VENDOR_UNKNOWN,
VENDOR_NVIDIA,
VENDOR_AMD,
VENDOR_INTEL
};
struct opengl {
/* context */
GLXContext ctx;
glxCreateContext create_context;
/* info */
const char *vendor_str;
const char *version_str;
const char *extensions_str;
const char *renderer_str;
const char *glsl_version_str;
enum graphics_card_vendors vendor;
/* version */
float version;
int major_version;
int minor_version;
/* extensions */
int glsl_available;
int vertex_buffer_obj_available;
int vertex_array_obj_available;
int map_buffer_range_available;
int fragment_program_available;
};
struct device {
GLuint vbo, vao, ebo;
GLuint prog;
GLuint vert_shdr;
GLuint frag_shdr;
GLint attrib_pos;
GLint attrib_uv;
GLint attrib_col;
GLint uniform_tex;
GLint uniform_proj;
GLuint font_tex;
struct zr_draw_null_texture null;
struct zr_buffer cmds;
};
struct XWindow {
Display *dpy;
Window win;
XVisualInfo *vis;
Colormap cmap;
XSetWindowAttributes swa;
XWindowAttributes attr;
GLXFBConfig fbc;
int width, height;
};
static int gl_err = FALSE;
static void
die(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fputs("\n", stderr);
exit(EXIT_FAILURE);
}
static char*
file_load(const char* path, size_t* siz)
{
char *buf;
FILE *fd = fopen(path, "rb");
if (!fd) die("Failed to open file: %s\n", path);
fseek(fd, 0, SEEK_END);
*siz = (size_t)ftell(fd);
fseek(fd, 0, SEEK_SET);
buf = (char*)calloc(*siz, 1);
fread(buf, *siz, 1, fd);
fclose(fd);
return buf;
}
static int
gl_check_extension(struct opengl *GL, const char *ext)
{
const char *start, *where, *term;
where = strchr(ext, ' ');
if (where || *ext == '\0')
return FALSE;
for (start = GL->extensions_str;;) {
where = strstr((const char*)start, ext);
if (!where) break;
term = where + strlen(ext);
if (where == start || *(where - 1) == ' ') {
if (*term == ' ' || *term == '\0')
return TRUE;
}
start = term;
}
return FALSE;
}
#define GL_EXT(name) (q##name)gl_ext(#name)
static __GLXextFuncPtr
gl_ext(const char *name)
{
__GLXextFuncPtr func;
func = glXGetProcAddress((const GLubyte*)name);
if (!func) {
fprintf(stdout, "[GL]: failed to load extension: %s", name);
return NULL;
}
return func;
}
static int
gl_error_handler(Display *dpy, XErrorEvent *ev)
{
UNUSED((dpy, ev));
gl_err = TRUE;
return 0;
}
static int
stricmpn(const char *a, const char *b, int len)
{
int i = 0;
for (i = 0; i < len && a[i] && b[i]; ++i)
if (a[i] != b[i]) return 1;
if (i != len) return 1;
return 0;
}
static void
device_init(struct device *dev)
{
GLint status;
static const GLchar *vertex_shader =
"#version 300 es\n"
"uniform mat4 ProjMtx;\n"
"in vec2 Position;\n"
"in vec2 TexCoord;\n"
"in vec4 Color;\n"
"out vec2 Frag_UV;\n"
"out vec4 Frag_Color;\n"
"void main() {\n"
" Frag_UV = TexCoord;\n"
" Frag_Color = Color;\n"
" gl_Position = ProjMtx * vec4(Position.xy, 0, 1);\n"
"}\n";
static const GLchar *fragment_shader =
"#version 300 es\n"
"precision mediump float;\n"
"uniform sampler2D Texture;\n"
"in vec2 Frag_UV;\n"
"in vec4 Frag_Color;\n"
"out vec4 Out_Color;\n"
"void main(){\n"
" Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
"}\n";
dev->prog = glCreateProgram();
dev->vert_shdr = glCreateShader(GL_VERTEX_SHADER);
dev->frag_shdr = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(dev->vert_shdr, 1, &vertex_shader, 0);
glShaderSource(dev->frag_shdr, 1, &fragment_shader, 0);
glCompileShader(dev->vert_shdr);
glCompileShader(dev->frag_shdr);
glGetShaderiv(dev->vert_shdr, GL_COMPILE_STATUS, &status);
assert(status == GL_TRUE);
glGetShaderiv(dev->frag_shdr, GL_COMPILE_STATUS, &status);
assert(status == GL_TRUE);
glAttachShader(dev->prog, dev->vert_shdr);
glAttachShader(dev->prog, dev->frag_shdr);
glLinkProgram(dev->prog);
glGetProgramiv(dev->prog, GL_LINK_STATUS, &status);
assert(status == GL_TRUE);
dev->uniform_tex = glGetUniformLocation(dev->prog, "Texture");
dev->uniform_proj = glGetUniformLocation(dev->prog, "ProjMtx");
dev->attrib_pos = glGetAttribLocation(dev->prog, "Position");
dev->attrib_uv = glGetAttribLocation(dev->prog, "TexCoord");
dev->attrib_col = glGetAttribLocation(dev->prog, "Color");
{
/* buffer setup */
GLsizei vs = sizeof(struct zr_draw_vertex);
size_t vp = offsetof(struct zr_draw_vertex, position);
size_t vt = offsetof(struct zr_draw_vertex, uv);
size_t vc = offsetof(struct zr_draw_vertex, col);
glGenBuffers(1, &dev->vbo);
glGenBuffers(1, &dev->ebo);
glGenVertexArrays(1, &dev->vao);
glBindVertexArray(dev->vao);
glBindBuffer(GL_ARRAY_BUFFER, dev->vbo);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, dev->ebo);
glEnableVertexAttribArray((GLuint)dev->attrib_pos);
glEnableVertexAttribArray((GLuint)dev->attrib_uv);
glEnableVertexAttribArray((GLuint)dev->attrib_col);
glVertexAttribPointer((GLuint)dev->attrib_pos, 2, GL_FLOAT, GL_FALSE, vs, (void*)vp);
glVertexAttribPointer((GLuint)dev->attrib_uv, 2, GL_FLOAT, GL_FALSE, vs, (void*)vt);
glVertexAttribPointer((GLuint)dev->attrib_col, 4, GL_UNSIGNED_BYTE, GL_TRUE, vs, (void*)vc);
}
glBindTexture(GL_TEXTURE_2D, 0);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glBindVertexArray(0);
}
static struct zr_user_font
font_bake_and_upload(struct device *dev, struct zr_font *font,
const char *path, unsigned int font_height, const zr_rune *range)
{
int glyph_count;
int img_width, img_height;
struct zr_font_glyph *glyphes;
struct zr_baked_font baked_font;
struct zr_user_font user_font;
struct zr_recti custom;
memset(&baked_font, 0, sizeof(baked_font));
memset(&user_font, 0, sizeof(user_font));
memset(&custom, 0, sizeof(custom));
{
/* bake and upload font texture */
void *img, *tmp;
size_t ttf_size;
size_t tmp_size, img_size;
const char *custom_data = "....";
struct zr_font_config config;
char *ttf_blob = file_load(path, &ttf_size);
if (!ttf_blob)
die("[Font]: %s is not a file or cannot be found!\n", path);
/* setup font configuration */
memset(&config, 0, sizeof(config));
config.ttf_blob = ttf_blob;
config.ttf_size = ttf_size;
config.font = &baked_font;
config.coord_type = ZR_COORD_UV;
config.range = range;
config.pixel_snap = zr_false;
config.size = (float)font_height;
config.spacing = zr_vec2(0,0);
config.oversample_h = 1;
config.oversample_v = 1;
/* query needed amount of memory for the font baking process */
zr_font_bake_memory(&tmp_size, &glyph_count, &config, 1);
glyphes = (struct zr_font_glyph*)calloc(sizeof(struct zr_font_glyph), (size_t)glyph_count);
tmp = calloc(1, tmp_size);
/* pack all glyphes and return needed image width, height and memory size*/
custom.w = 2; custom.h = 2;
if (!zr_font_bake_pack(&img_size, &img_width,&img_height,&custom,tmp,tmp_size,&config, 1))
die("[Font]: failed to load font!\n");
/* bake all glyphes and custom white pixel into image */
img = calloc(1, img_size);
zr_font_bake(img, img_width, img_height, tmp, tmp_size, glyphes, glyph_count, &config, 1);
zr_font_bake_custom_data(img, img_width, img_height, custom, custom_data, 2, 2, '.', 'X');
{
/* convert alpha8 image into rgba8 image */
void *img_rgba = calloc(4, (size_t)(img_height * img_width));
zr_font_bake_convert(img_rgba, img_width, img_height, img);
free(img);
img = img_rgba;
}
{
/* upload baked font image */
glGenTextures(1, &dev->font_tex);
glBindTexture(GL_TEXTURE_2D, dev->font_tex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, (GLsizei)img_width, (GLsizei)img_height, 0,
GL_RGBA, GL_UNSIGNED_BYTE, img);
}
free(ttf_blob);
free(tmp);
free(img);
}
/* default white pixel in a texture which is needed to draw primitives */
dev->null.texture.id = (int)dev->font_tex;
dev->null.uv = zr_vec2((custom.x + 0.5f)/(float)img_width,
(custom.y + 0.5f)/(float)img_height);
/* setup font with glyphes. IMPORTANT: the font only references the glyphes
this was done to have the possibility to have multible fonts with one
total glyph array. Not quite sure if it is a good thing since the
glyphes have to be freed as well. */
zr_font_init(font, (float)font_height, '?', glyphes, &baked_font, dev->null.texture);
user_font = zr_font_ref(font);
return user_font;
}
static void
device_shutdown(struct device *dev)
{
glDetachShader(dev->prog, dev->vert_shdr);
glDetachShader(dev->prog, dev->frag_shdr);
glDeleteShader(dev->vert_shdr);
glDeleteShader(dev->frag_shdr);
glDeleteProgram(dev->prog);
glDeleteTextures(1, &dev->font_tex);
glDeleteBuffers(1, &dev->vbo);
glDeleteBuffers(1, &dev->ebo);
glDeleteVertexArrays(1, &dev->vao);
}
static void
device_draw(struct device *dev, struct zr_context *ctx, int width, int height,
enum zr_anti_aliasing AA)
{
GLint last_prog, last_tex;
GLint last_ebo, last_vbo, last_vao;
GLfloat ortho[4][4] = {
{2.0f, 0.0f, 0.0f, 0.0f},
{0.0f,-2.0f, 0.0f, 0.0f},
{0.0f, 0.0f,-1.0f, 0.0f},
{-1.0f,1.0f, 0.0f, 1.0f},
};
ortho[0][0] /= (GLfloat)width;
ortho[1][1] /= (GLfloat)height;
/* save previous opengl state */
glGetIntegerv(GL_CURRENT_PROGRAM, &last_prog);
glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_tex);
glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_vao);
glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &last_ebo);
glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vbo);
/* setup global state */
glEnable(GL_BLEND);
glBlendEquation(GL_FUNC_ADD);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glDisable(GL_CULL_FACE);
glDisable(GL_DEPTH_TEST);
glEnable(GL_SCISSOR_TEST);
glActiveTexture(GL_TEXTURE0);
/* setup program */
glUseProgram(dev->prog);
glUniform1i(dev->uniform_tex, 0);
glUniformMatrix4fv(dev->uniform_proj, 1, GL_FALSE, &ortho[0][0]);
{
/* convert from command queue into draw list and draw to screen */
void *vertexes, *elements;
const struct zr_draw_command *cmd;
const zr_draw_index *offset = NULL;
/* allocate vertex and element buffer */
glBindVertexArray(dev->vao);
glBindBuffer(GL_ARRAY_BUFFER, dev->vbo);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, dev->ebo);
glBufferData(GL_ARRAY_BUFFER, MAX_VERTEX_MEMORY, NULL, GL_STREAM_DRAW);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, MAX_ELEMENT_MEMORY, NULL, GL_STREAM_DRAW);
/* load draw vertexes & elements directly into vertex + element buffer */
vertexes = glMapBuffer(GL_ARRAY_BUFFER, GL_WRITE_ONLY);
elements = glMapBuffer(GL_ELEMENT_ARRAY_BUFFER, GL_WRITE_ONLY);
{
struct zr_buffer vbuf, ebuf;
/* fill converting configuration */
struct zr_convert_config config;
memset(&config, 0, sizeof(config));
config.shape_AA = AA;
config.line_AA = AA;
config.circle_segment_count = 22;
config.line_thickness = 1.0f;
config.null = dev->null;
/* setup buffers to load vertexes and elements */
zr_buffer_init_fixed(&vbuf, vertexes, MAX_VERTEX_MEMORY);
zr_buffer_init_fixed(&ebuf, elements, MAX_ELEMENT_MEMORY);
zr_convert(ctx, &dev->cmds, &vbuf, &ebuf, &config);
}
glUnmapBuffer(GL_ARRAY_BUFFER);
glUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER);
/* iterate over and execute each draw command */
zr_draw_foreach(cmd, ctx, &dev->cmds) {
if (!cmd->elem_count) continue;
glBindTexture(GL_TEXTURE_2D, (GLuint)cmd->texture.id);
glScissor((GLint)cmd->clip_rect.x,
height - (GLint)(cmd->clip_rect.y + cmd->clip_rect.h),
(GLint)cmd->clip_rect.w, (GLint)cmd->clip_rect.h);
glDrawElements(GL_TRIANGLES, (GLsizei)cmd->elem_count, GL_UNSIGNED_SHORT, offset);
offset += cmd->elem_count;
}
zr_clear(ctx);
}
/* restore old state */
glUseProgram((GLuint)last_prog);
glBindTexture(GL_TEXTURE_2D, (GLuint)last_tex);
glBindBuffer(GL_ARRAY_BUFFER, (GLuint)last_vbo);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, (GLuint)last_ebo);
glBindVertexArray((GLuint)last_vao);
glDisable(GL_SCISSOR_TEST);
}
static void
input_key(struct XWindow *xw, struct zr_context *ctx, XEvent *evt, int down)
{
int ret;
KeySym *code = XGetKeyboardMapping(xw->dpy, (KeyCode)evt->xkey.keycode, 1, &ret);
if (*code == XK_Shift_L || *code == XK_Shift_R)
zr_input_key(ctx, ZR_KEY_SHIFT, down);
else if (*code == XK_Delete)
zr_input_key(ctx, ZR_KEY_DEL, down);
else if (*code == XK_Return)
zr_input_key(ctx, ZR_KEY_ENTER, down);
else if (*code == XK_Tab)
zr_input_key(ctx, ZR_KEY_TAB, down);
else if (*code == XK_space && !down)
zr_input_char(ctx, ' ');
else if (*code == XK_Left)
zr_input_key(ctx, ZR_KEY_LEFT, down);
else if (*code == XK_Right)
zr_input_key(ctx, ZR_KEY_RIGHT, down);
else if (*code == XK_BackSpace)
zr_input_key(ctx, ZR_KEY_BACKSPACE, down);
else if (*code > 32 && *code < 128) {
if (*code == 'c')
zr_input_key(ctx, ZR_KEY_COPY, down && (evt->xkey.state & ControlMask));
else if (*code == 'v')
zr_input_key(ctx, ZR_KEY_PASTE, down && (evt->xkey.state & ControlMask));
else if (*code == 'x')
zr_input_key(ctx, ZR_KEY_CUT, down && (evt->xkey.state & ControlMask));
if (!down)
zr_input_unicode(ctx, (zr_rune)*code);
}
XFree(code);
}
static void
input_motion(struct zr_context *ctx, XEvent *evt)
{
const int x = evt->xmotion.x;
const int y = evt->xmotion.y;
zr_input_motion(ctx, x, y);
}
static void
input_button(struct zr_context *ctx, XEvent *evt, int down)
{
const int x = evt->xbutton.x;
const int y = evt->xbutton.y;
if (evt->xbutton.button == Button1)
zr_input_button(ctx, ZR_BUTTON_LEFT, x, y, down);
else if (evt->xbutton.button == Button3)
zr_input_button(ctx, ZR_BUTTON_RIGHT, x, y, down);
else if (evt->xbutton.button == Button4)
zr_input_scroll(ctx, 1.0f);
else if (evt->xbutton.button == Button5)
zr_input_scroll(ctx, -1.0f);
}
static void* mem_alloc(zr_handle unused, size_t size)
{UNUSED(unused); return calloc(1, size);}
static void mem_free(zr_handle unused, void *ptr)
{UNUSED(unused); free(ptr);}
int main(int argc, char **argv)
{
int running = 1;
const char *font_path;
struct opengl gl;
struct device device;
struct demo gui;
struct zr_font font;
struct XWindow win;
memset(&gl, 0, sizeof(gl));
memset(&win, 0, sizeof(win));
memset(&gui, 0, sizeof(gui));
font_path = argv[1];
if (argc < 2)
die("Missing TTF Font file argument!");
win.dpy = XOpenDisplay(NULL);
if (!win.dpy) die("Failed to open X display\n");
{
/* check glx version */
int glx_major, glx_minor;
if (!glXQueryVersion(win.dpy, &glx_major, &glx_minor))
die("[X11]: Error: Failed to query OpenGL version\n");
if ((glx_major == 1 && glx_minor < 3) || (glx_major < 1))
die("[X11]: Error: Invalid GLX version!\n");
fprintf(stdout, "[X11]: OpenGL version %d.%d\n", glx_major, glx_minor);
}
{
/* find and pick matching framebuffer visual */
int fb_count;
static GLint attr[] = {
GLX_X_RENDERABLE, True,
GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
GLX_RENDER_TYPE, GLX_RGBA_BIT,
GLX_X_VISUAL_TYPE, GLX_TRUE_COLOR,
GLX_RED_SIZE, 8,
GLX_GREEN_SIZE, 8,
GLX_BLUE_SIZE, 8,
GLX_ALPHA_SIZE, 8,
GLX_DEPTH_SIZE, 24,
GLX_STENCIL_SIZE, 8,
GLX_DOUBLEBUFFER, True,
None
};
GLXFBConfig *fbc;
fprintf(stdout, "[X11]: Query matching framebuffer configurations\n");
fbc = glXChooseFBConfig(win.dpy, DefaultScreen(win.dpy), attr, &fb_count);
if (!fbc) die("[X11]: Error: failed to retrieve framebuffer configuration\n");
fprintf(stdout, "[X11]: Found %d matching framebuffer configurations\n", fb_count);
{
/* pick framebuffer with most samples per pixel */
int i, fb_best = -1, best_num_samples = -1;
for (i = 0; i < fb_count; ++i) {
XVisualInfo *vi = glXGetVisualFromFBConfig(win.dpy, fbc[i]);
if (vi) {
int sample_buffer, samples;
glXGetFBConfigAttrib(win.dpy, fbc[i], GLX_SAMPLE_BUFFERS, &sample_buffer);
glXGetFBConfigAttrib(win.dpy, fbc[i], GLX_SAMPLES, &samples);
fprintf(stdout, "\tFramebuffer Config %d: Visual ID 0x%2x: "
"(SAMPLE_BUFFER: %d, SAMPLES: %d)\n", i, (unsigned int)vi->visualid,
sample_buffer, samples);
if ((fb_best < 0) || (sample_buffer && samples > best_num_samples))
fb_best = i; best_num_samples = samples;
}
}
win.fbc = fbc[fb_best];
XFree(fbc);
win.vis = glXGetVisualFromFBConfig(win.dpy, win.fbc);
fprintf(stdout, "[X11]: Chosen visual id: 0x%x\n", (unsigned)win.vis->visualid);
}
}
{
/* create window */
fprintf(stdout, "[X11]: Creating colormap\n");
win.cmap = XCreateColormap(win.dpy, RootWindow(win.dpy, win.vis->screen), win.vis->visual, AllocNone);
win.swa.colormap = win.cmap;
win.swa.background_pixmap = None;
win.swa.border_pixel = 0;
win.swa.event_mask =
ExposureMask | KeyPressMask | KeyReleaseMask |
ButtonPress | ButtonReleaseMask| ButtonMotionMask |
Button1MotionMask | Button3MotionMask | Button4MotionMask | Button5MotionMask|
PointerMotionMask| StructureNotifyMask;
fprintf(stdout, "[X11]: Creating window\n");
win.win = XCreateWindow(win.dpy, RootWindow(win.dpy, win.vis->screen), 0, 0,
WINDOW_WIDTH, WINDOW_HEIGHT, 0, win.vis->depth, InputOutput,
win.vis->visual, CWBorderPixel|CWColormap|CWEventMask, &win.swa);
if (!win.win) die("[X11]: Failed to create window\n");
XFree(win.vis);
XStoreName(win.dpy, win.win, "Zahnrad");
fprintf(stdout, "[X11]: Mapping window\n");
XMapWindow(win.dpy, win.win);
}
{
/* create opengl context */
int(*old_handler)(Display*, XErrorEvent*) = XSetErrorHandler(gl_error_handler);
gl.extensions_str = glXQueryExtensionsString(win.dpy, DefaultScreen(win.dpy));
gl.create_context = (glxCreateContext)
glXGetProcAddressARB((const GLubyte*)"glXCreateContextAttribsARB");
gl_err = FALSE;
if (!gl_check_extension(&gl, "GLX_ARB_create_context") || !gl.create_context) {
fprintf(stdout, "[X11]: glXCreateContextAttribARB() not found...\n");
fprintf(stdout, "[X11]: ... using old-style GLX context\n");
gl.ctx = glXCreateNewContext(win.dpy, win.fbc, GLX_RGBA_TYPE, 0, True);
} else {
GLint attr[] = {
GLX_CONTEXT_MAJOR_VERSION_ARB, OGL_MAJOR_VERSION,
GLX_CONTEXT_MINOR_VERSION_ARB, OGL_MINOR_VERSION,
None
};
fprintf(stdout, "[X11]: Creating Context...\n");
gl.ctx = gl.create_context(win.dpy, win.fbc, 0, True, attr);
XSync(win.dpy, False);
if (gl_err || !gl.ctx) {
/* Could not create GL 3.0 context. Fallback to old 2.x context.
* If a version below 3.0 is requested, implementations will
* return the newest context version compatible with OpenGL
* version less than version 3.0.*/
attr[1] = 1; attr[3] = 0;
gl_err = FALSE;
fprintf(stdout, "[X11] Failed to create OpenGL 3.0 context\n");
fprintf(stdout, "[X11] ... using old-style GLX context!\n");
gl.ctx = gl.create_context(win.dpy, win.fbc, 0, True, attr);
} else fprintf(stdout, "[X11] OpenGL 3.0 Context created\n");
}
XSync(win.dpy, False);
XSetErrorHandler(old_handler);
if (gl_err || !gl.ctx)
die("[X11]: Failed to create an OpenGL context\n");
if (!glXIsDirect(win.dpy, gl.ctx))
fprintf(stdout, "[X11] Optained indirect GLX rendering context\n");
else fprintf(stdout, "[X11] Optained direct GLX rendering context\n");
glXMakeCurrent(win.dpy, win.win, gl.ctx);
}
{
int failed = FALSE;
gl.version_str = (const char*)glGetString(GL_VERSION);
glGetIntegerv(GL_MAJOR_VERSION, &gl.major_version);
glGetIntegerv(GL_MINOR_VERSION, &gl.minor_version);
if (gl.major_version < 2)
die("[GL]: Graphics card does not fullfill minimum OpenGL 2.0 support\n");
gl.version = (float)gl.major_version + (float)gl.minor_version * 0.1f;
gl.renderer_str = (const char*)glGetString(GL_RENDERER);
gl.extensions_str = (const char*)glGetString(GL_EXTENSIONS);
gl.glsl_version_str = (const char*)glGetString(GL_SHADING_LANGUAGE_VERSION);
gl.vendor_str = (const char*)glGetString(GL_VENDOR);
if (!stricmpn(gl.vendor_str, "ATI", 4) ||
!stricmpn(gl.vendor_str, "AMD", 4))
gl.vendor = VENDOR_AMD;
else if (!stricmpn(gl.vendor_str, "NVIDIA", 6))
gl.vendor = VENDOR_NVIDIA;
else if (!stricmpn(gl.vendor_str, "Intel", 5))
gl.vendor = VENDOR_INTEL;
else gl.vendor = VENDOR_UNKNOWN;
fprintf(stdout, "[GL] OpenGL\n");
fprintf(stdout, "\tVersion: %d.%d\n", gl.major_version, gl.minor_version);
fprintf(stdout, "\tVendor: %s\n", gl.vendor_str);
fprintf(stdout, "\tRenderer: %s\n", gl.renderer_str);
fprintf(stdout, "\tGLSL: %s\n\n", gl.glsl_version_str);
/* Extensions */
fprintf(stdout, "[GL] Loading extensions...\n");
gl.glsl_available = (gl.version >= 2.0f);
if (gl.glsl_available) {
/* GLSL core in OpenGL > 2 */
glCreateShader = GL_EXT(glCreateShader);
glShaderSource = GL_EXT(glShaderSource);
glCompileShader = GL_EXT(glCompileShader);
glGetShaderiv = GL_EXT(glGetShaderiv);
glGetShaderInfoLog = GL_EXT(glGetShaderInfoLog);
glDeleteShader = GL_EXT(glDeleteShader);
glCreateProgram = GL_EXT(glCreateProgram);
glAttachShader = GL_EXT(glAttachShader);
glDetachShader = GL_EXT(glDetachShader);
glLinkProgram = GL_EXT(glLinkProgram);
glUseProgram = GL_EXT(glUseProgram);
glGetProgramiv = GL_EXT(glGetProgramiv);
glGetProgramInfoLog = GL_EXT(glGetProgramInfoLog);
glDeleteProgram = GL_EXT(glDeleteProgram);
glGetUniformLocation = GL_EXT(glGetUniformLocation);
glGetAttribLocation = GL_EXT(glGetAttribLocation);
glUniform1i = GL_EXT(glUniform1i);
glUniform1f = GL_EXT(glUniform1f);
glUniformMatrix3fv = GL_EXT(glUniformMatrix3fv);
glUniformMatrix4fv = GL_EXT(glUniformMatrix4fv);
}
gl.vertex_buffer_obj_available = gl_check_extension(&gl, "GL_ARB_vertex_buffer_object");
if (gl.vertex_buffer_obj_available) {
/* GL_ARB_vertex_buffer_object */
glGenBuffers = GL_EXT(glGenBuffers);
glBindBuffer = GL_EXT(glBindBuffer);
glBufferData = GL_EXT(glBufferData);
glBufferSubData = GL_EXT(glBufferSubData);
glMapBuffer = GL_EXT(glMapBuffer);
glUnmapBuffer = GL_EXT(glUnmapBuffer);
glDeleteBuffers = GL_EXT(glDeleteBuffers);
}
gl.fragment_program_available = gl_check_extension(&gl, "GL_ARB_fragment_program");
if (gl.fragment_program_available) {
/* GL_ARB_vertex_program / GL_ARB_fragment_program */
glVertexAttribPointer = GL_EXT(glVertexAttribPointer);
glEnableVertexAttribArray = GL_EXT(glEnableVertexAttribArray);
glDisableVertexAttribArray = GL_EXT(glDisableVertexAttribArray);
}
gl.vertex_array_obj_available = gl_check_extension(&gl, "GL_ARB_vertex_array_object");
if (gl.vertex_array_obj_available) {
/* GL_ARB_vertex_array_object */
glGenVertexArrays = GL_EXT(glGenVertexArrays);
glBindVertexArray = GL_EXT(glBindVertexArray);
glDeleteVertexArrays = GL_EXT(glDeleteVertexArrays);
}
if (!gl.vertex_buffer_obj_available) {
fprintf(stdout, "[GL] Error: GL_ARB_vertex_buffer_object is not available!\n");
failed = TRUE;
}
if (!gl.fragment_program_available) {
fprintf(stdout, "[GL] Error: GL_ARB_fragment_program is not available!\n");
failed = TRUE;
}
if (!gl.vertex_array_obj_available) {
fprintf(stdout, "[GL] Error: GL_ARB_vertex_array_object is not available!\n");
failed = TRUE;
}
if (failed) goto cleanup;
fprintf(stdout, "[GL] Extensions successfully loaded\n");
}
/* screen */
XGetWindowAttributes(win.dpy, win.win, &win.attr);
win.width = win.attr.width;
win.height = win.attr.height;
{
/* GUI */
struct zr_user_font usrfnt;
struct zr_allocator alloc;
alloc.userdata.ptr = NULL;
alloc.alloc = mem_alloc;
alloc.free = mem_free;
zr_buffer_init(&device.cmds, &alloc, 4024);
usrfnt = font_bake_and_upload(&device, &font, font_path, 14,
zr_font_default_glyph_ranges());
zr_init(&gui.ctx, &alloc, &usrfnt);
}
device_init(&device);
while (running) {
/* input */
XEvent evt;
zr_input_begin(&gui.ctx);
while (XCheckWindowEvent(win.dpy, win.win, win.swa.event_mask, &evt)) {
if (evt.type == KeyPress)
input_key(&win, &gui.ctx, &evt, zr_true);
else if (evt.type == KeyRelease)
input_key(&win, &gui.ctx, &evt, zr_false);
else if (evt.type == ButtonPress)
input_button(&gui.ctx, &evt, zr_true);
else if (evt.type == ButtonRelease)
input_button(&gui.ctx, &evt, zr_false);
else if (evt.type == MotionNotify)
input_motion(&gui.ctx, &evt);
else if (evt.type == Expose || evt.type == ConfigureNotify) {
XGetWindowAttributes(win.dpy, win.win, &win.attr);
win.width = win.attr.width;
win.height = win.attr.height;
}
}
zr_input_end(&gui.ctx);
/* GUI */
XGetWindowAttributes(win.dpy, win.win, &win.attr);
running = run_demo(&gui);
/* Draw */
glClear(GL_COLOR_BUFFER_BIT);
glClearColor(0.2f, 0.2f, 0.2f, 1.0f);
glViewport(0, 0, win.width, win.height);
device_draw(&device, &gui.ctx, win.width, win.height, ZR_ANTI_ALIASING_ON);
glXSwapBuffers(win.dpy, win.win);
}
cleanup:
free(font.glyphs);
zr_free(&gui.ctx);
zr_buffer_free(&device.cmds);
device_shutdown(&device);
glXMakeCurrent(win.dpy, 0, 0);
glXDestroyContext(win.dpy, gl.ctx);
XUnmapWindow(win.dpy, win.win);
XFreeColormap(win.dpy, win.cmap);
XDestroyWindow(win.dpy, win.win);
XCloseDisplay(win.dpy);
return 0;
}
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