[libpicofe.git] / gl.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>

#include <EGL/egl.h>
#include <GLES/gl.h>
#include "gl_loader.h"
#include "gl_platform.h"
#include "gl.h"

static EGLDisplay edpy = EGL_NO_DISPLAY;
static EGLSurface esfc = EGL_NO_SURFACE;
static EGLContext ectxt = EGL_NO_CONTEXT;

static GLuint texture_name;

/* for external flips */
void *gl_es_display;
void *gl_es_surface;

static int tex_w, tex_h;
static void *tex_mem;
static int flip_old_w, flip_old_h;

static int gl_have_error(const char *name)
{
	GLenum e = glGetError();
	if (e != GL_NO_ERROR) {
		fprintf(stderr, "GL error: %s %x\n", name, e);
		return 1;
	}
	return 0;
}

static int gles_have_error(const char *name)
{
	EGLint e = eglGetError();
	if (e != EGL_SUCCESS) {
		fprintf(stderr, "%s %x\n", name, e);
		return 1;
	}
	return 0;
}

int gl_init(void *display, int *quirks)
{
	int retval = -1;
	int ret;

	ret = gl_platform_init(&display, quirks);
	if (ret != 0) {
		fprintf(stderr, "gl_platform_init failed with %d\n", ret);
		return retval;
	}

	edpy = eglGetDisplay((EGLNativeDisplayType)display);
	if (edpy == EGL_NO_DISPLAY) {
		fprintf(stderr, "Failed to get EGL display\n");
		goto out;
	}

	if (!eglInitialize(edpy, NULL, NULL)) {
		fprintf(stderr, "Failed to initialize EGL\n");
		goto out;
	}
	retval = 0;

out:
	if (retval && edpy != EGL_NO_DISPLAY)
		gl_shutdown();
	return retval;
}

int gl_create(void *window, int *quirks, int w, int h)
{
	EGLConfig ecfg = NULL;
	EGLint num_config;
	int retval = -1;
	int ret;
	EGLint config_attr[] =
	{
		EGL_NONE
	};

	ret = gl_platform_create(&window, quirks);
	if (ret != 0) {
		fprintf(stderr, "gl_platform_init failed with %d\n", ret);
		return retval;
	}

	flip_old_w = flip_old_h = 0;
	for (tex_w = 1; tex_w < w; tex_w *= 2)
		;
	for (tex_h = 1; tex_h < h; tex_h *= 2)
		;
	tex_mem = realloc(tex_mem, tex_w * tex_h * 2);
	if (tex_mem == NULL) {
		fprintf(stderr, "OOM\n");
		goto out;
	}
	memset(tex_mem, 0, tex_w * tex_h * 2);

	if (!eglChooseConfig(edpy, config_attr, &ecfg, 1, &num_config)) {
		fprintf(stderr, "Failed to choose config (%x)\n", eglGetError());
		goto out;
	}

	if (ecfg == NULL || num_config == 0) {
		fprintf(stderr, "No EGL configs available\n");
		goto out;
	}

	esfc = eglCreateWindowSurface(edpy, ecfg,
		(EGLNativeWindowType)window, NULL);
	if (esfc == EGL_NO_SURFACE) {
		fprintf(stderr, "Unable to create EGL surface (%x)\n",
			eglGetError());
		goto out;
	}

	ectxt = eglCreateContext(edpy, ecfg, EGL_NO_CONTEXT, NULL);
	if (ectxt == EGL_NO_CONTEXT) {
		fprintf(stderr, "Unable to create EGL context (%x)\n",
			eglGetError());
		// on mesa, some distros disable ES1.x but compat GL still works
		ret = eglBindAPI(EGL_OPENGL_API);
		if (!ret) {
			fprintf(stderr, "eglBindAPI: %x\n", eglGetError());
			goto out;
		}
		ectxt = eglCreateContext(edpy, ecfg, EGL_NO_CONTEXT, NULL);
		if (ectxt == EGL_NO_CONTEXT) {
			fprintf(stderr, "giving up on EGL context (%x)\n",
				eglGetError());
			goto out;
		}
	}

	ret = eglMakeCurrent(edpy, esfc, esfc, ectxt);
	if (!ret) {
		fprintf(stderr, "eglMakeCurrent: %x\n", eglGetError());
		goto out;
	}
	
	ret = *quirks & GL_QUIRK_VSYNC_ON ? 1 : 0;
	eglSwapInterval(edpy, ret);

	// 1.x (fixed-function) only
	glEnable(GL_TEXTURE_2D);
	glGetError();

	assert(!texture_name);

	glGenTextures(1, &texture_name);
	if (gl_have_error("glGenTextures"))
		goto out;

	glBindTexture(GL_TEXTURE_2D, texture_name);
	if (gl_have_error("glBindTexture"))
		goto out;

	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, tex_w, tex_h, 0, GL_RGB,
		GL_UNSIGNED_SHORT_5_6_5, tex_mem);
	if (gl_have_error("glTexImage2D"))
		goto out;

	// no mipmaps
	ret = *quirks & GL_QUIRK_SCALING_NEAREST ? GL_NEAREST : GL_LINEAR;
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, ret);
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, ret);

	//glViewport(0, 0, 512, 512);
	glLoadIdentity();
	glFrontFace(GL_CW);
	glEnable(GL_CULL_FACE);

	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
	glEnableClientState(GL_VERTEX_ARRAY);

	if (gl_have_error("init"))
		goto out;

	gl_es_display = (void *)edpy;
	gl_es_surface = (void *)esfc;
	retval = 0;
out:
	if (retval && edpy != EGL_NO_DISPLAY)
		gl_destroy();
	return retval;
}

void gl_announce(void)
{
	printf("GL_RENDERER: %s\n", (char *)glGetString(GL_RENDERER));
	printf("GL_VERSION: %s\n", (char *)glGetString(GL_VERSION));
}

static const float default_vertices[] = {
	-1.0f,  1.0f,  0.0f, // 0    0  1
	 1.0f,  1.0f,  0.0f, // 1  ^
	-1.0f, -1.0f,  0.0f, // 2  | 2  3
	 1.0f, -1.0f,  0.0f, // 3  +-->
};

static float texture[] = {
	0.0f, 0.0f, // we flip this:
	1.0f, 0.0f, // v^
	0.0f, 1.0f, //  |  u
	1.0f, 1.0f, //  +-->
};

int gl_flip_v(const void *fb, int w, int h, const float *vertices)
{
	gl_have_error("pre-flip unknown");

	glBindTexture(GL_TEXTURE_2D, texture_name);
	if (gl_have_error("glBindTexture"))
		return -1;

	if (fb != NULL) {
		if (w != flip_old_w || h != flip_old_h) {
			float f_w = (float)w / tex_w;
			float f_h = (float)h / tex_h;
			texture[1*2 + 0] = f_w;
			texture[2*2 + 1] = f_h;
			texture[3*2 + 0] = f_w;
			texture[3*2 + 1] = f_h;
			flip_old_w = w;
			flip_old_h = h;
		}

		glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, w, h,
			GL_RGB, GL_UNSIGNED_SHORT_5_6_5, fb);
		if (gl_have_error("glTexSubImage2D")) {
			fprintf(stderr, "  %dx%d t: %dx%d %p\n", w, h, tex_w, tex_h, fb);
			return -1;
		}
	}

	glVertexPointer(3, GL_FLOAT, 0, vertices ? vertices : default_vertices);
	glTexCoordPointer(2, GL_FLOAT, 0, texture);
	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
	if (gl_have_error("glDrawArrays"))
		return -1;

	eglSwapBuffers(edpy, esfc);
	if (gles_have_error("eglSwapBuffers"))
		return -1;

	return 0;
}

int gl_flip(const void *fb, int w, int h)
{
	return gl_flip_v(fb, w, h, NULL);
}

// to be used once after exiting menu, etc
void gl_clear(void)
{
	glClearColor(0, 0, 0, 0);
	glClear(GL_COLOR_BUFFER_BIT);
	eglSwapBuffers(edpy, esfc);
	glClear(GL_COLOR_BUFFER_BIT);
	eglSwapBuffers(edpy, esfc);
	glClear(GL_COLOR_BUFFER_BIT);
	gl_have_error("glClear");
}

void gl_destroy(void)
{
	if (edpy == EGL_NO_DISPLAY)
		return; // nothing to do

	// sometimes there is an error... from somewhere?
	//gl_have_error("finish");
	glGetError();

	if (texture_name)
	{
		glDeleteTextures(1, &texture_name);
		gl_have_error("glDeleteTextures");
		texture_name = 0;
	}

	eglMakeCurrent(edpy, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
	if (ectxt != EGL_NO_CONTEXT) {
		eglDestroyContext(edpy, ectxt);
		ectxt = EGL_NO_CONTEXT;
	}
	if (esfc != EGL_NO_SURFACE) {
		eglDestroySurface(edpy, esfc);
		esfc = EGL_NO_SURFACE;
	}

	gl_es_surface = (void *)esfc;

	if (tex_mem) free(tex_mem);
	tex_mem = NULL;

	gl_platform_destroy();
}

void gl_shutdown(void)
{
	if (edpy != EGL_NO_DISPLAY) {
		eglTerminate(edpy);
		edpy = EGL_NO_DISPLAY;
	}

	gl_es_display = (void *)edpy;

	gl_platform_shutdown();
}
Commit	Line	Data
	1	#include <stdio.h>
	2	#include <stdlib.h>
	3	#include <string.h>
	4	#include <assert.h>
	5
	6	#include <EGL/egl.h>
	7	#include <GLES/gl.h>
	8	#include "gl_loader.h"
	9	#include "gl_platform.h"
	10	#include "gl.h"
	11
	12	static EGLDisplay edpy = EGL_NO_DISPLAY;
	13	static EGLSurface esfc = EGL_NO_SURFACE;
	14	static EGLContext ectxt = EGL_NO_CONTEXT;
	15
	16	static GLuint texture_name;
	17
	18	/* for external flips */
	19	void *gl_es_display;
	20	void *gl_es_surface;
	21
	22	static int tex_w, tex_h;
	23	static void *tex_mem;
	24	static int flip_old_w, flip_old_h;
	25
	26	static int gl_have_error(const char *name)
	27	{
	28	GLenum e = glGetError();
	29	if (e != GL_NO_ERROR) {
	30	fprintf(stderr, "GL error: %s %x\n", name, e);
	31	return 1;
	32	}
	33	return 0;
	34	}
	35
	36	static int gles_have_error(const char *name)
	37	{
	38	EGLint e = eglGetError();
	39	if (e != EGL_SUCCESS) {
	40	fprintf(stderr, "%s %x\n", name, e);
	41	return 1;
	42	}
	43	return 0;
	44	}
	45
	46	int gl_init(void display, int quirks)
	47	{
	48	int retval = -1;
	49	int ret;
	50
	51	ret = gl_platform_init(&display, quirks);
	52	if (ret != 0) {
	53	fprintf(stderr, "gl_platform_init failed with %d\n", ret);
	54	return retval;
	55	}
	56
	57	edpy = eglGetDisplay((EGLNativeDisplayType)display);
	58	if (edpy == EGL_NO_DISPLAY) {
	59	fprintf(stderr, "Failed to get EGL display\n");
	60	goto out;
	61	}
	62
	63	if (!eglInitialize(edpy, NULL, NULL)) {
	64	fprintf(stderr, "Failed to initialize EGL\n");
	65	goto out;
	66	}
	67	retval = 0;
	68
	69	out:
	70	if (retval && edpy != EGL_NO_DISPLAY)
	71	gl_shutdown();
	72	return retval;
	73	}
	74
	75	int gl_create(void window, int quirks, int w, int h)
	76	{
	77	EGLConfig ecfg = NULL;
	78	EGLint num_config;
	79	int retval = -1;
	80	int ret;
	81	EGLint config_attr[] =
	82	{
	83	EGL_NONE
	84	};
	85
	86	ret = gl_platform_create(&window, quirks);
	87	if (ret != 0) {
	88	fprintf(stderr, "gl_platform_init failed with %d\n", ret);
	89	return retval;
	90	}
	91
	92	flip_old_w = flip_old_h = 0;
	93	for (tex_w = 1; tex_w < w; tex_w *= 2)
	94	;
	95	for (tex_h = 1; tex_h < h; tex_h *= 2)
	96	;
	97	tex_mem = realloc(tex_mem, tex_w * tex_h * 2);
	98	if (tex_mem == NULL) {
	99	fprintf(stderr, "OOM\n");
	100	goto out;
	101	}
	102	memset(tex_mem, 0, tex_w * tex_h * 2);
	103
	104	if (!eglChooseConfig(edpy, config_attr, &ecfg, 1, &num_config)) {
	105	fprintf(stderr, "Failed to choose config (%x)\n", eglGetError());
	106	goto out;
	107	}
	108
	109	if (ecfg == NULL \|\| num_config == 0) {
	110	fprintf(stderr, "No EGL configs available\n");
	111	goto out;
	112	}
	113
	114	esfc = eglCreateWindowSurface(edpy, ecfg,
	115	(EGLNativeWindowType)window, NULL);
	116	if (esfc == EGL_NO_SURFACE) {
	117	fprintf(stderr, "Unable to create EGL surface (%x)\n",
	118	eglGetError());
	119	goto out;
	120	}
	121
	122	ectxt = eglCreateContext(edpy, ecfg, EGL_NO_CONTEXT, NULL);
	123	if (ectxt == EGL_NO_CONTEXT) {
	124	fprintf(stderr, "Unable to create EGL context (%x)\n",
	125	eglGetError());
	126	// on mesa, some distros disable ES1.x but compat GL still works
	127	ret = eglBindAPI(EGL_OPENGL_API);
	128	if (!ret) {
	129	fprintf(stderr, "eglBindAPI: %x\n", eglGetError());
	130	goto out;
	131	}
	132	ectxt = eglCreateContext(edpy, ecfg, EGL_NO_CONTEXT, NULL);
	133	if (ectxt == EGL_NO_CONTEXT) {
	134	fprintf(stderr, "giving up on EGL context (%x)\n",
	135	eglGetError());
	136	goto out;
	137	}
	138	}
	139
	140	ret = eglMakeCurrent(edpy, esfc, esfc, ectxt);
	141	if (!ret) {
	142	fprintf(stderr, "eglMakeCurrent: %x\n", eglGetError());
	143	goto out;
	144	}
	145
	146	ret = *quirks & GL_QUIRK_VSYNC_ON ? 1 : 0;
	147	eglSwapInterval(edpy, ret);
	148
	149	// 1.x (fixed-function) only
	150	glEnable(GL_TEXTURE_2D);
	151	glGetError();
	152
	153	assert(!texture_name);
	154
	155	glGenTextures(1, &texture_name);
	156	if (gl_have_error("glGenTextures"))
	157	goto out;
	158
	159	glBindTexture(GL_TEXTURE_2D, texture_name);
	160	if (gl_have_error("glBindTexture"))
	161	goto out;
	162
	163	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, tex_w, tex_h, 0, GL_RGB,
	164	GL_UNSIGNED_SHORT_5_6_5, tex_mem);
	165	if (gl_have_error("glTexImage2D"))
	166	goto out;
	167
	168	// no mipmaps
	169	ret = *quirks & GL_QUIRK_SCALING_NEAREST ? GL_NEAREST : GL_LINEAR;
	170	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, ret);
	171	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, ret);
	172
	173	//glViewport(0, 0, 512, 512);
	174	glLoadIdentity();
	175	glFrontFace(GL_CW);
	176	glEnable(GL_CULL_FACE);
	177
	178	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
	179	glEnableClientState(GL_VERTEX_ARRAY);
	180
	181	if (gl_have_error("init"))
	182	goto out;
	183
	184	gl_es_display = (void *)edpy;
	185	gl_es_surface = (void *)esfc;
	186	retval = 0;
	187	out:
	188	if (retval && edpy != EGL_NO_DISPLAY)
	189	gl_destroy();
	190	return retval;
	191	}
	192
	193	void gl_announce(void)
	194	{
	195	printf("GL_RENDERER: %s\n", (char *)glGetString(GL_RENDERER));
	196	printf("GL_VERSION: %s\n", (char *)glGetString(GL_VERSION));
	197	}
	198
	199	static const float default_vertices[] = {
	200	-1.0f, 1.0f, 0.0f, // 0 0 1
	201	1.0f, 1.0f, 0.0f, // 1 ^
	202	-1.0f, -1.0f, 0.0f, // 2 \| 2 3
	203	1.0f, -1.0f, 0.0f, // 3 +-->
	204	};
	205
	206	static float texture[] = {
	207	0.0f, 0.0f, // we flip this:
	208	1.0f, 0.0f, // v^
	209	0.0f, 1.0f, // \| u
	210	1.0f, 1.0f, // +-->
	211	};
	212
	213	int gl_flip_v(const void fb, int w, int h, const float vertices)
	214	{
	215	gl_have_error("pre-flip unknown");
	216
	217	glBindTexture(GL_TEXTURE_2D, texture_name);
	218	if (gl_have_error("glBindTexture"))
	219	return -1;
	220
	221	if (fb != NULL) {
	222	if (w != flip_old_w \|\| h != flip_old_h) {
	223	float f_w = (float)w / tex_w;
	224	float f_h = (float)h / tex_h;
	225	texture[1*2 + 0] = f_w;
	226	texture[2*2 + 1] = f_h;
	227	texture[3*2 + 0] = f_w;
	228	texture[3*2 + 1] = f_h;
	229	flip_old_w = w;
	230	flip_old_h = h;
	231	}
	232
	233	glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, w, h,
	234	GL_RGB, GL_UNSIGNED_SHORT_5_6_5, fb);
	235	if (gl_have_error("glTexSubImage2D")) {
	236	fprintf(stderr, " %dx%d t: %dx%d %p\n", w, h, tex_w, tex_h, fb);
	237	return -1;
	238	}
	239	}
	240
	241	glVertexPointer(3, GL_FLOAT, 0, vertices ? vertices : default_vertices);
	242	glTexCoordPointer(2, GL_FLOAT, 0, texture);
	243	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
	244	if (gl_have_error("glDrawArrays"))
	245	return -1;
	246
	247	eglSwapBuffers(edpy, esfc);
	248	if (gles_have_error("eglSwapBuffers"))
	249	return -1;
	250
	251	return 0;
	252	}
	253
	254	int gl_flip(const void *fb, int w, int h)
	255	{
	256	return gl_flip_v(fb, w, h, NULL);
	257	}
	258
	259	// to be used once after exiting menu, etc
	260	void gl_clear(void)
	261	{
	262	glClearColor(0, 0, 0, 0);
	263	glClear(GL_COLOR_BUFFER_BIT);
	264	eglSwapBuffers(edpy, esfc);
	265	glClear(GL_COLOR_BUFFER_BIT);
	266	eglSwapBuffers(edpy, esfc);
	267	glClear(GL_COLOR_BUFFER_BIT);
	268	gl_have_error("glClear");
	269	}
	270
	271	void gl_destroy(void)
	272	{
	273	if (edpy == EGL_NO_DISPLAY)
	274	return; // nothing to do
	275
	276	// sometimes there is an error... from somewhere?
	277	//gl_have_error("finish");
	278	glGetError();
	279
	280	if (texture_name)
	281	{
	282	glDeleteTextures(1, &texture_name);
	283	gl_have_error("glDeleteTextures");
	284	texture_name = 0;
	285	}
	286
	287	eglMakeCurrent(edpy, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
	288	if (ectxt != EGL_NO_CONTEXT) {
	289	eglDestroyContext(edpy, ectxt);
	290	ectxt = EGL_NO_CONTEXT;
	291	}
	292	if (esfc != EGL_NO_SURFACE) {
	293	eglDestroySurface(edpy, esfc);
	294	esfc = EGL_NO_SURFACE;
	295	}
	296
	297	gl_es_surface = (void *)esfc;
	298
	299	if (tex_mem) free(tex_mem);
	300	tex_mem = NULL;
	301
	302	gl_platform_destroy();
	303	}
	304
	305	void gl_shutdown(void)
	306	{
	307	if (edpy != EGL_NO_DISPLAY) {
	308	eglTerminate(edpy);
	309	edpy = EGL_NO_DISPLAY;
	310	}
	311
	312	gl_es_display = (void *)edpy;
	313
	314	gl_platform_shutdown();
	315	}