nuclear@0: #include <stdio.h>
nuclear@0: #include <stdlib.h>
nuclear@0: #include <math.h>
nuclear@11: #include <assert.h>
nuclear@0: #include "opengl.h"
nuclear@0: #include "game.h"
nuclear@7: #include "camera.h"
nuclear@10: #include "sdr.h"
nuclear@11: #include "sanegl.h"
nuclear@7: 
nuclear@8: static void draw_quad(float hsz, float vsz);
nuclear@0: 
nuclear@0: static int win_width, win_height;
nuclear@9: static float win_aspect;
nuclear@9: static int video_width, video_height;
nuclear@9: static float video_aspect;
nuclear@10: static unsigned int sdrprog;
nuclear@11: static int aloc_vertex, aloc_texcoord, uloc_tex;
nuclear@10: 
nuclear@10: static const char *vsdr_source =
nuclear@11: 	"attribute vec4 attr_vertex, attr_texcoord;\n"
nuclear@11: 	"uniform mat4 matrix_modelview, matrix_projection, matrix_texture;\n"
nuclear@10: 	"varying vec4 tex_coords;\n"
nuclear@10: 	"void main()\n"
nuclear@10: 	"{\n"
nuclear@11: 	"\tmat4 mvp = matrix_projection * matrix_modelview;\n"
nuclear@11: 	"\tgl_Position = mvp * attr_vertex;\n"
nuclear@11: 	"\ttex_coords = matrix_texture * attr_texcoord;\n"
nuclear@10: 	"}\n";
nuclear@10: 
nuclear@10: static const char *psdr_source =
nuclear@10: 	"#extension GL_OES_EGL_image_external : require\n"
nuclear@11: 	"precision mediump float;\n"
nuclear@10: 	"uniform samplerExternalOES tex;\n"
nuclear@10: 	"varying vec4 tex_coords;\n"
nuclear@10: 	"void main()\n"
nuclear@10: 	"{\n"
nuclear@10: 	"\tvec4 texel = texture2D(tex, tex_coords.xy);\n"
nuclear@10: 	"\tgl_FragColor = vec4(texel.xyz, 1.0);\n"
nuclear@10: 	"}\n";
nuclear@0: 
nuclear@0: 
nuclear@0: int game_init(void)
nuclear@0: {
nuclear@10: 	unsigned int vsdr, psdr;
nuclear@10: 
nuclear@0: 	glEnable(GL_DEPTH_TEST);
nuclear@0: 	glEnable(GL_CULL_FACE);
nuclear@0: 
nuclear@0: 	glClearColor(0.4, 0.4, 0.4, 1);
nuclear@8: 
nuclear@10: 	if(!(vsdr = create_vertex_shader(vsdr_source)))
nuclear@10: 		return -1;
nuclear@11: 	assert(glGetError() == GL_NO_ERROR);
nuclear@10: 	if(!(psdr = create_pixel_shader(psdr_source)))
nuclear@10: 		return -1;
nuclear@11: 	assert(glGetError() == GL_NO_ERROR);
nuclear@10: 	if(!(sdrprog = create_program_link(vsdr, psdr))) {
nuclear@10: 		fprintf(stderr, "failed to create shader program\n");
nuclear@10: 		return -1;
nuclear@10: 	}
nuclear@10: 	glUseProgram(sdrprog);
nuclear@11: 	aloc_vertex = glGetAttribLocation(sdrprog, "attr_vertex");
nuclear@11: 	aloc_texcoord = glGetAttribLocation(sdrprog, "attr_texcoord");
nuclear@11: 	uloc_tex = glGetUniformLocation(sdrprog, "tex");
nuclear@10: 
nuclear@8: 	cam_start_video();
nuclear@9: 	cam_video_size(&video_width, &video_height);
nuclear@9: 	if(video_height) {
nuclear@9: 		video_aspect = (float)video_width / (float)video_height;
nuclear@9: 	} else {
nuclear@9: 		video_aspect = 1.0;
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	printf("started video %dx%d (aspect: %g)\n", video_width, video_height, video_aspect);
nuclear@0: 	return 0;
nuclear@0: }
nuclear@0: 
nuclear@0: void game_shutdown(void)
nuclear@0: {
nuclear@8: 	cam_shutdown();
nuclear@10: 	free_program(sdrprog);
nuclear@0: }
nuclear@0: 
nuclear@0: void game_display(unsigned long msec)
nuclear@0: {
nuclear@9: 	unsigned int tex;
nuclear@9: 	const float *tex_matrix;
nuclear@9: 	float xscale, yscale;
nuclear@9: 
nuclear@8: 	cam_update();
nuclear@9: 	tex = cam_texture();
nuclear@9: 	tex_matrix = cam_texture_matrix();
nuclear@7: 
nuclear@4: 	//float tsec = (float)msec / 1000.0f;
nuclear@0: 
nuclear@4: 	//glClearColor(sin(tsec * 10.0), cos(tsec * 10.0), -sin(tsec * 10.0), 1.0);
nuclear@0: 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
nuclear@0: 
nuclear@11: 	gl_matrix_mode(GL_MODELVIEW);
nuclear@11: 	gl_load_identity();
nuclear@11: 	gl_matrix_mode(GL_TEXTURE);
nuclear@11: 	gl_load_matrixf(tex_matrix);
nuclear@11: 
nuclear@10: 	glUseProgram(sdrprog);
nuclear@10: 	glBindTexture(GL_TEXTURE_EXTERNAL_OES, tex);
nuclear@11: 	if(uloc_tex >= 0) {
nuclear@11: 		glUniform1i(uloc_tex, 0);
nuclear@11: 	}
nuclear@7: 
nuclear@9: 	if(video_aspect > win_aspect) {
nuclear@9: 		xscale = 1.0;
nuclear@9: 		yscale = 1.0 / video_aspect;
nuclear@9: 	} else {
nuclear@9: 		xscale = video_aspect;
nuclear@9: 		yscale = 1.0;
nuclear@9: 	}
nuclear@9: 	draw_quad(xscale, yscale);
nuclear@7: }
nuclear@7: 
nuclear@8: static void draw_quad(float hsz, float vsz)
nuclear@7: {
nuclear@7: 	static const float varr[] = {-1, -1, 1, -1, 1, 1, -1, 1};
nuclear@9: 	static const float tcarr[] = {0, 0, 1, 0, 1, 1, 0, 1};
nuclear@7: 
nuclear@10: 	if(aloc_vertex == -1) {
nuclear@10: 		return;
nuclear@10: 	}
nuclear@7: 
nuclear@11: 	gl_matrix_mode(GL_MODELVIEW);
nuclear@11: 	gl_push_matrix();
nuclear@11: 	gl_scalef(hsz, vsz, 1);
nuclear@11: 
nuclear@11: 	gl_apply_xform(sdrprog);
nuclear@7: 
nuclear@10: 	glEnableVertexAttribArray(aloc_vertex);
nuclear@10: 	glVertexAttribPointer(aloc_vertex, 2, GL_FLOAT, 0, 0, varr);
nuclear@11: 	if(aloc_texcoord != -1) {
nuclear@10: 		glEnableVertexAttribArray(aloc_texcoord);
nuclear@10: 		glVertexAttribPointer(aloc_texcoord, 2, GL_FLOAT, 0, 0, tcarr);
nuclear@10: 	}
nuclear@7: 
nuclear@8: 	glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
nuclear@7: 
nuclear@10: 	glDisableVertexAttribArray(aloc_vertex);
nuclear@11: 	if(aloc_texcoord != -1) {
nuclear@10: 		glDisableVertexAttribArray(aloc_texcoord);
nuclear@10: 	}
nuclear@11: 
nuclear@11: 	gl_pop_matrix();
nuclear@0: }
nuclear@0: 
nuclear@0: void game_reshape(int x, int y)
nuclear@0: {
nuclear@0: 	win_width = x;
nuclear@0: 	win_height = y;
nuclear@9: 	win_aspect = y ? (float)x / (float)y : 1.0;
nuclear@0: 	glViewport(0, 0, x, y);
nuclear@0: 
nuclear@11: 	gl_matrix_mode(GL_PROJECTION);
nuclear@11: 	gl_load_identity();
nuclear@11: 	gl_scalef((float)win_height / (float)win_width, 1, 1);
nuclear@0: }
nuclear@0: 
nuclear@0: void game_keyboard(int key, int pressed)
nuclear@0: {
nuclear@0: 	if(!pressed) return;
nuclear@0: 
nuclear@0: 	switch(key) {
nuclear@0: 	case 27:
nuclear@0: 		exit(0);
nuclear@0: 
nuclear@0: 	default:
nuclear@0: 		break;
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: #define MAX_TOUCH_IDS	16
nuclear@0: static struct {
nuclear@0: 	int bnstate[8];
nuclear@0: 	int prev_x, prev_y;
nuclear@0: } mstate[MAX_TOUCH_IDS];
nuclear@0: 
nuclear@0: void game_mouse_button(int id, int bn, int pressed, int x, int y)
nuclear@0: {
nuclear@0: 	if(id >= MAX_TOUCH_IDS) return;
nuclear@0: 
nuclear@0: 	mstate[id].prev_x = x;
nuclear@0: 	mstate[id].prev_y = y;
nuclear@0: 	mstate[id].bnstate[bn] = pressed;
nuclear@0: }
nuclear@0: 
nuclear@0: void game_mouse_motion(int id, int x, int y)
nuclear@0: {
nuclear@0: 	/*
nuclear@0: 	int dx, dy, cx, cy;
nuclear@0: 
nuclear@0: 	if(id >= MAX_TOUCH_IDS) return;
nuclear@0: 
nuclear@0: 	cx = win_width / 2;
nuclear@0: 	cy = win_height / 2;
nuclear@0: 
nuclear@0: 	dx = x - mstate[id].prev_x;
nuclear@0: 	dy = y - mstate[id].prev_y;
nuclear@0: 	mstate[id].prev_x = x;
nuclear@0: 	mstate[id].prev_y = y;
nuclear@0: 
nuclear@0: 	if(!dx && !dy) return;
nuclear@0: 
nuclear@0: 	if(mouselook || mstate[id].bnstate[0]) {
nuclear@0: 		player_turn(&player, dx * 0.5, dy * 0.5);
nuclear@0: 	}
nuclear@0: 	if(mstate[id].bnstate[2]) {
nuclear@0: 		dbg_cam_dist += 0.1 * dy;
nuclear@0: 		if(dbg_cam_dist < 0.0) dbg_cam_dist = 0.0;
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	if(mouselook) {
nuclear@0: 		warping_mouse = 1;
nuclear@0: 		set_mouse_pos(cx, cy);
nuclear@0: 		mstate[id].prev_x = cx;
nuclear@0: 		mstate[id].prev_y = cy;
nuclear@0: 	}
nuclear@0: 	*/
nuclear@0: }
nuclear@0: