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added no dep linux opengl version

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vurtun 2015-12-11 11:58:09 +01:00
parent 36d86df9ab
commit 9c3365e1ab
2 changed files with 927 additions and 0 deletions
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26
demo/linuxgl/Makefile Normal file
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# Install
BIN = zahnrad
# Compiler
CC = clang
DCC = gcc
# Flags
CFLAGS = -std=c89 -pedantic
SRC = linuxgl.c ../../zahnrad.c
OBJ = $(SRC:.c=.o)
# Modes
.PHONY: gcc
gcc: CC = gcc
gcc: $(BIN)
.PHONY: clang
clang: CC = clang
clang: $(BIN)
$(BIN):
@mkdir -p bin
rm -f bin/$(BIN) $(OBJS)
$(CC) $(SRC) $(CFLAGS) -o bin/$(BIN) -lX11 -lm -lGL -lm -lGLU

901
demo/linuxgl/linuxgl.c Normal file
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#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"
#define UNUSED(a) ((void)(a))
static void clipboard_set(const char *text){UNUSED(text);}
static int clipboard_is_filled(void){return zr_false;}
static const char* clipboard_get(void) {return NULL;}
#include "../demo.c"
#define RAD(a) ((a) * (FPI / 180.0f))
#define DEG(a) ((a) * (180.0f / FPI))
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#define MAX(a,b) ((a) < (b) ? (b) : (a))
#define ABS(x) (((a) < 0) ? (-(a)) : (a))
#define SIGN(x) (((x) > 0) - ((x) < 0))
#define CLAMP(i,v,x) (MAX(MIN(v,x), i))
#define LEN(a) (sizeof(a)/sizeof(a)[0])
#define UNUSED(a) ((void)(a))
/* prefered OpenGL version */
#define OGL_MAJOR_VERSION 3
#define OGL_MINOR_VERSION 0
#define MAX_DRAW_COMMAND_MEMORY (4 * 1024)
#define MAX_VERTEX_MEMORY 128 * 1024
#define MAX_ELEMENT_MEMORY 64 * 1024
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;
/* constants */
int max_texture_size;
int max_texture_coords;
int max_texture_image_units;
/* 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);
}
/* this is stupid but needed for C89 since sinf and cosf do not exist */
static float fsin(float f) {return (float)sin(f);}
static float fcos(float f) {return (float)cos(f);}
static void
device_draw(struct device *dev, struct zr_command_queue *queue, 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 */
struct zr_draw_list draw_list;
const struct zr_draw_command *cmd;
void *vertexes, *elements;
const zr_draw_index *offset = NULL;
/* allocate vertex and element buffer */
memset(&draw_list, 0, sizeof(draw_list));
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;
zr_buffer_init_fixed(&vbuf, vertexes, MAX_VERTEX_MEMORY);
zr_buffer_init_fixed(&ebuf, elements, MAX_ELEMENT_MEMORY);
zr_draw_list_init(&draw_list, &dev->cmds, &vbuf, &ebuf,
fsin, fcos, dev->null, AA);
zr_draw_list_load(&draw_list, queue, 1.0f, 22);
}
glUnmapBuffer(GL_ARRAY_BUFFER);
glUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER);
/* iterate over and execute each draw command */
zr_foreach_draw_command(cmd, &draw_list) {
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_command_queue_clear(queue);
zr_draw_list_clear(&draw_list);
}
/* 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_input *in, 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(in, ZR_KEY_SHIFT, down);
else if (*code == XK_Delete)
zr_input_key(in, ZR_KEY_DEL, down);
else if (*code == XK_Return)
zr_input_key(in, ZR_KEY_ENTER, down);
else if (*code == XK_Tab)
zr_input_key(in, ZR_KEY_TAB, down);
else if (*code == XK_space && !down)
zr_input_char(in, ' ');
else if (*code == XK_Left)
zr_input_key(in, ZR_KEY_LEFT, down);
else if (*code == XK_Right)
zr_input_key(in, ZR_KEY_RIGHT, down);
else if (*code == XK_BackSpace)
zr_input_key(in, ZR_KEY_BACKSPACE, down);
else if (*code > 32 && *code < 128) {
if (*code == 'c')
zr_input_key(in, ZR_KEY_COPY, down && (evt->xkey.state & ControlMask));
else if (*code == 'v')
zr_input_key(in, ZR_KEY_PASTE, down && (evt->xkey.state & ControlMask));
else if (*code == 'x')
zr_input_key(in, ZR_KEY_CUT, down && (evt->xkey.state & ControlMask));
if (!down)
zr_input_unicode(in, (zr_rune)*code);
}
XFree(code);
}
static void
input_motion(struct zr_input *in, XEvent *evt)
{
const int x = evt->xmotion.x;
const int y = evt->xmotion.y;
zr_input_motion(in, x, y);
}
static void
input_button(struct zr_input *in, XEvent *evt, int down)
{
const int x = evt->xbutton.x;
const int y = evt->xbutton.y;
if (evt->xbutton.button == Button1)
zr_input_button(in, ZR_BUTTON_LEFT, x, y, down);
else if (evt->xbutton.button == Button3)
zr_input_button(in, ZR_BUTTON_RIGHT, x, y, down);
else if (evt->xbutton.button == Button4)
zr_input_scroll(in, 1.0f);
else if (evt->xbutton.button == Button5)
zr_input_scroll(in, -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)
{
const char *font_path;
struct XWindow win;
struct opengl gl;
struct zr_allocator alloc;
struct device device;
struct demo gui;
struct zr_font font;
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, "QuakEd");
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 */
alloc.userdata.ptr = NULL;
alloc.alloc = mem_alloc;
alloc.free = mem_free;
zr_buffer_init(&device.cmds, &alloc, 1024, 2.0f);
zr_command_queue_init(&gui.queue, &alloc, 1024, 2.0f);
gui.font = font_bake_and_upload(&device, &font, font_path, 14,
zr_font_default_glyph_ranges());
init_demo(&gui);
device_init(&device);
/* main loop */
while (gui.running) {
/* input */
XEvent evt;
zr_input_begin(&gui.input);
while (XCheckWindowEvent(win.dpy, win.win, win.swa.event_mask, &evt)) {
if (evt.type == KeyPress)
input_key(&win, &gui.input, &evt, zr_true);
else if (evt.type == KeyRelease)
input_key(&win, &gui.input, &evt, zr_false);
else if (evt.type == ButtonPress)
input_button(&gui.input, &evt, zr_true);
else if (evt.type == ButtonRelease)
input_button(&gui.input, &evt, zr_false);
else if (evt.type == MotionNotify)
input_motion(&gui.input, &evt);
}
zr_input_end(&gui.input);
/* GUI */
XGetWindowAttributes(win.dpy, win.win, &win.attr);
gui.w = (size_t)win.width, gui.h = (size_t)win.height;
run_demo(&gui);
/* Draw */
glClear(GL_COLOR_BUFFER_BIT);
glClearColor(0.9f, 0.9f, 0.9f, 1.0f);
glViewport(0, 0, win.width, win.height);
device_draw(&device, &gui.queue, win.width, win.height, ZR_ANTI_ALIASING_ON);
glXSwapBuffers(win.dpy, win.win);
}
cleanup:
free(font.glyphs);
zr_command_queue_free(&gui.queue);
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;
}