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#include <SDL2/SDL.h>
#include <SDL2/SDL_opengl.h>
#include <assert.h>
#include "renderer.h"
#include "atlas.inl"
#define BUFFER_SIZE 16384
static GLfloat tex_buf[BUFFER_SIZE * 8];
static GLfloat vert_buf[BUFFER_SIZE * 8];
static GLubyte color_buf[BUFFER_SIZE * 16];
static GLuint index_buf[BUFFER_SIZE * 6];
static int width = 800;
static int height = 600;
static int buf_idx;
static SDL_Window *window;
static const char button_map[256] = {
[ SDL_BUTTON_LEFT & 0xff ] = MU_MOUSE_LEFT,
[ SDL_BUTTON_RIGHT & 0xff ] = MU_MOUSE_RIGHT,
[ SDL_BUTTON_MIDDLE & 0xff ] = MU_MOUSE_MIDDLE,
};
static const char key_map[256] = {
[ SDLK_LSHIFT & 0xff ] = MU_KEY_SHIFT,
[ SDLK_RSHIFT & 0xff ] = MU_KEY_SHIFT,
[ SDLK_LCTRL & 0xff ] = MU_KEY_CTRL,
[ SDLK_RCTRL & 0xff ] = MU_KEY_CTRL,
[ SDLK_LALT & 0xff ] = MU_KEY_ALT,
[ SDLK_RALT & 0xff ] = MU_KEY_ALT,
[ SDLK_RETURN & 0xff ] = MU_KEY_RETURN,
[ SDLK_BACKSPACE & 0xff ] = MU_KEY_BACKSPACE,
};
void r_init(void) {
/* init SDL window */
SDL_Init(SDL_INIT_EVERYTHING);
window = SDL_CreateWindow(
NULL, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
width, height, SDL_WINDOW_OPENGL);
SDL_GL_CreateContext(window);
/* init gl */
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glDisable(GL_CULL_FACE);
glDisable(GL_DEPTH_TEST);
glEnable(GL_SCISSOR_TEST);
glEnable(GL_TEXTURE_2D);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
/* init texture */
GLuint id;
glGenTextures(1, &id);
glBindTexture(GL_TEXTURE_2D, id);
glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, ATLAS_WIDTH, ATLAS_HEIGHT, 0,
GL_ALPHA, GL_UNSIGNED_BYTE, atlas_texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
assert(glGetError() == 0);
}
static void
handle_event(SDL_Event e, mu_Context *ctx) {
switch (e.type) {
case SDL_QUIT: {
exit(EXIT_SUCCESS);
}
break; case SDL_MOUSEMOTION: {
mu_input_mousemove(ctx, e.motion.x, e.motion.y);
}
break; case SDL_MOUSEWHEEL: {
mu_input_scroll(ctx, 0, e.wheel.y * -30);
}
break; case SDL_TEXTINPUT: {
mu_input_text(ctx, e.text.text);
}
break; case SDL_MOUSEBUTTONDOWN: case SDL_MOUSEBUTTONUP: {
int b = button_map[e.button.button & 0xff];
if (b && e.type == SDL_MOUSEBUTTONDOWN) {
mu_input_mousedown(ctx, e.button.x, e.button.y, b);
}
if (b && e.type == SDL_MOUSEBUTTONUP) {
mu_input_mouseup(ctx, e.button.x, e.button.y, b);
}
}
break; case SDL_KEYDOWN: case SDL_KEYUP: {
int c = key_map[e.key.keysym.sym & 0xff];
if (c && e.type == SDL_KEYDOWN) {
mu_input_keydown(ctx, c);
}
if (c && e.type == SDL_KEYUP) {
mu_input_keyup(ctx, c);
}
}
}
}
void
r_handle_input(mu_Context *ctx) {
SDL_Event e;
while (SDL_PollEvent(&e)) {
handle_event(e, ctx);
}
}
static void flush(void) {
if (buf_idx == 0) { return; }
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glOrtho(0.0f, width, height, 0.0f, -1.0f, +1.0f);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
glTexCoordPointer(2, GL_FLOAT, 0, tex_buf);
glVertexPointer(2, GL_FLOAT, 0, vert_buf);
glColorPointer(4, GL_UNSIGNED_BYTE, 0, color_buf);
glDrawElements(GL_TRIANGLES, buf_idx * 6, GL_UNSIGNED_INT, index_buf);
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
buf_idx = 0;
}
static void push_quad(mu_Rect dst, mu_Rect src, mu_Color color) {
if (buf_idx == BUFFER_SIZE) { flush(); }
int texvert_idx = buf_idx * 8;
int color_idx = buf_idx * 16;
int element_idx = buf_idx * 4;
int index_idx = buf_idx * 6;
buf_idx++;
/* update texture buffer */
float x = src.x / (float) ATLAS_WIDTH;
float y = src.y / (float) ATLAS_HEIGHT;
float w = src.w / (float) ATLAS_WIDTH;
float h = src.h / (float) ATLAS_HEIGHT;
tex_buf[texvert_idx + 0] = x;
tex_buf[texvert_idx + 1] = y;
tex_buf[texvert_idx + 2] = x + w;
tex_buf[texvert_idx + 3] = y;
tex_buf[texvert_idx + 4] = x;
tex_buf[texvert_idx + 5] = y + h;
tex_buf[texvert_idx + 6] = x + w;
tex_buf[texvert_idx + 7] = y + h;
/* update vertex buffer */
vert_buf[texvert_idx + 0] = dst.x;
vert_buf[texvert_idx + 1] = dst.y;
vert_buf[texvert_idx + 2] = dst.x + dst.w;
vert_buf[texvert_idx + 3] = dst.y;
vert_buf[texvert_idx + 4] = dst.x;
vert_buf[texvert_idx + 5] = dst.y + dst.h;
vert_buf[texvert_idx + 6] = dst.x + dst.w;
vert_buf[texvert_idx + 7] = dst.y + dst.h;
/* update color buffer */
memcpy(color_buf + color_idx + 0, &color, 4);
memcpy(color_buf + color_idx + 4, &color, 4);
memcpy(color_buf + color_idx + 8, &color, 4);
memcpy(color_buf + color_idx + 12, &color, 4);
/* update index buffer */
index_buf[index_idx + 0] = element_idx + 0;
index_buf[index_idx + 1] = element_idx + 1;
index_buf[index_idx + 2] = element_idx + 2;
index_buf[index_idx + 3] = element_idx + 2;
index_buf[index_idx + 4] = element_idx + 3;
index_buf[index_idx + 5] = element_idx + 1;
}
void r_draw_rect(mu_Rect rect, mu_Color color) {
push_quad(rect, atlas[ATLAS_WHITE], color);
}
void r_draw_text(const char *text, mu_Vec2 pos, mu_Color color) {
mu_Rect dst = { pos.x, pos.y, 0, 0 };
for (const char *p = text; *p; p++) {
if ((*p & 0xc0) == 0x80) { continue; }
int chr = mu_min((unsigned char) *p, 127);
mu_Rect src = atlas[ATLAS_FONT + chr];
dst.w = src.w;
dst.h = src.h;
push_quad(dst, src, color);
dst.x += dst.w;
}
}
void r_draw_icon(int id, mu_Rect rect, mu_Color color) {
mu_Rect src = atlas[id];
int x = rect.x + (rect.w - src.w) / 2;
int y = rect.y + (rect.h - src.h) / 2;
push_quad(mu_rect(x, y, src.w, src.h), src, color);
}
int r_get_text_width(const char *text, int len) {
int res = 0;
for (const char *p = text; *p && len--; p++) {
if ((*p & 0xc0) == 0x80) { continue; }
int chr = mu_min((unsigned char) *p, 127);
res += atlas[ATLAS_FONT + chr].w;
}
return res;
}
int r_get_text_height(void) {
return 18;
}
void r_get_window_size(int *w, int *h) {
SDL_GetWindowSize(window, w, h);
}
void r_set_clip_rect(mu_Rect rect) {
flush();
glScissor(rect.x, height - (rect.y + rect.h), rect.w, rect.h);
}
void r_clear(mu_Color clr) {
flush();
glClearColor(clr.r / 255., clr.g / 255., clr.b / 255., clr.a / 255.);
glClear(GL_COLOR_BUFFER_BIT);
}
void r_present(void) {
flush();
SDL_GL_SwapWindow(window);
}
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