From 50fb1482f6dd3d738ba5fd23dfa6789c0f397c92 Mon Sep 17 00:00:00 2001
From: Leo Tenenbaum <pommicket@gmail.com>
Date: Sat, 5 Dec 2020 14:31:19 -0500
Subject: rotating line

---
 sim.c | 104 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 sim.c

(limited to 'sim.c')

diff --git a/sim.c b/sim.c
new file mode 100644
index 0000000..bbb26d6
--- /dev/null
+++ b/sim.c
@@ -0,0 +1,104 @@
+#include "gui.h"
+#ifdef _WIN32
+#include <windows.h>
+#include "lib/glcorearb.h"
+#endif
+#include <GL/gl.h>
+#include <time.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include <assert.h>
+#include <ctype.h>
+
+#define MATH_GL
+#include "math.c"
+#include "sim.h"
+#include "time.c"
+#include "util.c"
+#include "base.c"
+
+
+static void platforms_render(Platform *platforms, u32 nplatforms) {
+static float t = 0.0f;
+	glColor3f(1,0,1);
+	glBegin(GL_QUADS);
+	for (Platform *platform = platforms, *end = platform + nplatforms; platform != end; ++platform) {
+		platform->angle = t += 0.01f;
+		// calculate endpoints of platform
+		float radius = platform->size * 0.5f;
+		v2 endpoint1 = v2_add(platform->center, v2_polar(radius, platform->angle));
+		v2 endpoint2 = v2_sub(platform->center, v2_polar(radius, platform->angle));
+
+		v2 thickness = v2_polar(0.005f, platform->angle - HALF_PIf);
+		v2_gl_vertex(v2_sub(endpoint1, thickness));
+		v2_gl_vertex(v2_sub(endpoint2, thickness));
+		v2_gl_vertex(v2_add(endpoint2, thickness));
+		v2_gl_vertex(v2_add(endpoint1, thickness));
+	}
+	glEnd();
+}
+
+#ifdef _WIN32
+__declspec(dllexport)
+#endif
+#ifdef __cplusplus
+extern "C"
+#endif
+void sim_frame(Frame *frame) {
+	if (frame->memory_size < sizeof(State)) {
+		printf("Not enough memory (got %lu, require %lu).\n", (ulong)frame->memory_size, (ulong)sizeof(State));
+		frame->close = true;
+		return;
+	}
+	State *state = (State *)frame->memory;
+	i32 width = frame->width, height = frame->height;
+	Input *input = &frame->input;
+	maybe_unused u8 *keys_pressed = input->keys_pressed;
+	maybe_unused bool *keys_down = input->keys_down;
+
+	state->win_width  = width;
+	state->win_height = height;
+	
+	// set up GL
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+	glViewport(0, 0, width, height);
+	glMatrixMode(GL_MODELVIEW);
+	glLoadIdentity();
+	//glOrtho(, -1, +1);
+	glClearColor(0, 0, 0, 1);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+
+	if (!state->initialized) {
+		logln("Initializing...");
+		strcpy(frame->title, "physics");
+			
+
+		state->nplatforms = 1;
+		Platform *p = &state->platforms[0];
+		p->center = V2(0.5f, 0.5f);
+		p->angle  = PIf * 0.3f;
+		p->size   = 0.2f;
+		
+		state->initialized = true;
+	#if DEBUG
+		state->magic_number = MAGIC_NUMBER;
+	#endif
+	}
+	if (input->keys_pressed[KEY_ESCAPE]) {
+		frame->close = true;
+		return;
+	}
+
+	platforms_render(state->platforms, state->nplatforms);
+
+	#if DEBUG
+	GLuint error = glGetError();
+	if (error) {
+		printf("!!! GL ERROR: %u\n", error);
+	}
+	#endif
+}
-- 
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