aboutsummaryrefslogtreecommitdiff
path: root/render/gles2/renderer.c
blob: ad739cf8f18840d4e9b84972373793c531493505 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
#include <assert.h>
#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#include <stdint.h>
#include <stdlib.h>
#include <wayland-server-protocol.h>
#include <wayland-util.h>
#include <wlr/backend.h>
#include <wlr/render.h>
#include <wlr/render/egl.h>
#include <wlr/render/interface.h>
#include <wlr/render/matrix.h>
#include <wlr/util/log.h>
#include "render/gles2.h"
#include "glapi.h"

struct shaders shaders;

static bool compile_shader(GLuint type, const GLchar *src, GLuint *shader) {
	*shader = GL_CALL(glCreateShader(type));
	int len = strlen(src);
	GL_CALL(glShaderSource(*shader, 1, &src, &len));
	GL_CALL(glCompileShader(*shader));
	GLint success;
	GL_CALL(glGetShaderiv(*shader, GL_COMPILE_STATUS, &success));
	if (success == GL_FALSE) {
		GLint loglen;
		GL_CALL(glGetShaderiv(*shader, GL_INFO_LOG_LENGTH, &loglen));
		GLchar msg[loglen];
		GL_CALL(glGetShaderInfoLog(*shader, loglen, &loglen, msg));
		wlr_log(L_ERROR, "Shader compilation failed");
		wlr_log(L_ERROR, "%s", msg);
		glDeleteShader(*shader);
		return false;
	}
	return true;
}

static bool compile_program(const GLchar *vert_src,
		const GLchar *frag_src, GLuint *program) {
	GLuint vertex, fragment;
	if (!compile_shader(GL_VERTEX_SHADER, vert_src, &vertex)) {
		return false;
	}
	if (!compile_shader(GL_FRAGMENT_SHADER, frag_src, &fragment)) {
		glDeleteShader(vertex);
		return false;
	}
	*program = GL_CALL(glCreateProgram());
	GL_CALL(glAttachShader(*program, vertex));
	GL_CALL(glAttachShader(*program, fragment));
	GL_CALL(glLinkProgram(*program));
	GLint success;
	GL_CALL(glGetProgramiv(*program, GL_LINK_STATUS, &success));
	if (success == GL_FALSE) {
		GLint loglen;
		GL_CALL(glGetProgramiv(*program, GL_INFO_LOG_LENGTH, &loglen));
		GLchar msg[loglen];
		GL_CALL(glGetProgramInfoLog(*program, loglen, &loglen, msg));
		wlr_log(L_ERROR, "Program link failed");
		wlr_log(L_ERROR, "%s", msg);
		glDeleteProgram(*program);
		glDeleteShader(vertex);
		glDeleteShader(fragment);
		return false;
	}
	glDetachShader(*program, vertex);
	glDetachShader(*program, fragment);
	glDeleteShader(vertex);
	glDeleteShader(fragment);

	return true;
}

static void init_default_shaders() {
	if (shaders.initialized) {
		return;
	}
	if (!compile_program(vertex_src, fragment_src_rgba, &shaders.rgba)) {
		goto error;
	}
	if (!compile_program(vertex_src, fragment_src_rgbx, &shaders.rgbx)) {
		goto error;
	}
	if (!compile_program(quad_vertex_src, quad_fragment_src, &shaders.quad)) {
		goto error;
	}
	if (!compile_program(quad_vertex_src, ellipse_fragment_src, &shaders.ellipse)) {
		goto error;
	}
	if (glEGLImageTargetTexture2DOES) {
		if (!compile_program(quad_vertex_src, fragment_src_external, &shaders.external)) {
			goto error;
		}
	}

	wlr_log(L_DEBUG, "Compiled default shaders");
	shaders.initialized = true;
	return;
error:
	wlr_log(L_ERROR, "Failed to set up default shaders!");
}

static void init_globals() {
	init_default_shaders();
}

static void wlr_gles2_begin(struct wlr_renderer *wlr_renderer,
		struct wlr_output *output) {
	GL_CALL(glViewport(0, 0, output->width, output->height));

	// enable transparency
	GL_CALL(glEnable(GL_BLEND));
	GL_CALL(glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA));

	// Note: maybe we should save output projection and remove some of the need
	// for users to sling matricies themselves
}

static void wlr_gles2_end(struct wlr_renderer *wlr_renderer) {
	// no-op
}

static void wlr_gles2_clear(struct wlr_renderer *wlr_renderer,
		const float (*color)[4]) {
	glClearColor((*color)[0], (*color)[1], (*color)[2], (*color)[3]);
	glClear(GL_COLOR_BUFFER_BIT);
}

static void wlr_gles2_scissor(struct wlr_renderer *wlr_renderer,
		struct wlr_box *box) {
	if (box != NULL) {
		glScissor(box->x, box->y, box->width, box->height);
		glEnable(GL_SCISSOR_TEST);
	} else {
		glDisable(GL_SCISSOR_TEST);
	}
}

static struct wlr_texture *wlr_gles2_texture_create(
		struct wlr_renderer *wlr_renderer) {
	struct wlr_gles2_renderer *renderer =
		(struct wlr_gles2_renderer *)wlr_renderer;
	return gles2_texture_create(renderer->egl);
}

static void draw_quad() {
	GLfloat verts[] = {
		1, 0, // top right
		0, 0, // top left
		1, 1, // bottom right
		0, 1, // bottom left
	};
	GLfloat texcoord[] = {
		1, 0, // top right
		0, 0, // top left
		1, 1, // bottom right
		0, 1, // bottom left
	};

	GL_CALL(glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, verts));
	GL_CALL(glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0, texcoord));

	GL_CALL(glEnableVertexAttribArray(0));
	GL_CALL(glEnableVertexAttribArray(1));

	GL_CALL(glDrawArrays(GL_TRIANGLE_STRIP, 0, 4));

	GL_CALL(glDisableVertexAttribArray(0));
	GL_CALL(glDisableVertexAttribArray(1));
}

static bool wlr_gles2_render_texture(struct wlr_renderer *wlr_renderer,
		struct wlr_texture *texture, const float (*matrix)[16], float alpha) {
	if (!texture || !texture->valid) {
		wlr_log(L_ERROR, "attempt to render invalid texture");
		return false;
	}

	wlr_texture_bind(texture);
	GL_CALL(glUniformMatrix4fv(0, 1, GL_FALSE, *matrix));
	GL_CALL(glUniform1f(2, alpha));
	draw_quad();
	return true;
}


static void wlr_gles2_render_quad(struct wlr_renderer *wlr_renderer,
		const float (*color)[4], const float (*matrix)[16]) {
	GL_CALL(glUseProgram(shaders.quad));
	GL_CALL(glUniformMatrix4fv(0, 1, GL_FALSE, *matrix));
	GL_CALL(glUniform4f(1, (*color)[0], (*color)[1], (*color)[2], (*color)[3]));
	draw_quad();
}

static void wlr_gles2_render_ellipse(struct wlr_renderer *wlr_renderer,
		const float (*color)[4], const float (*matrix)[16]) {
	GL_CALL(glUseProgram(shaders.ellipse));
	GL_CALL(glUniformMatrix4fv(0, 1, GL_TRUE, *matrix));
	GL_CALL(glUniform4f(1, (*color)[0], (*color)[1], (*color)[2], (*color)[3]));
	draw_quad();
}

static const enum wl_shm_format *wlr_gles2_formats(
		struct wlr_renderer *renderer, size_t *len) {
	static enum wl_shm_format formats[] = {
		WL_SHM_FORMAT_ARGB8888,
		WL_SHM_FORMAT_XRGB8888,
		WL_SHM_FORMAT_ABGR8888,
		WL_SHM_FORMAT_XBGR8888,
	};
	*len = sizeof(formats) / sizeof(formats[0]);
	return formats;
}

static bool wlr_gles2_buffer_is_drm(struct wlr_renderer *wlr_renderer,
		struct wl_resource *buffer) {
	struct wlr_gles2_renderer *renderer =
		(struct wlr_gles2_renderer *)wlr_renderer;
	EGLint format;
	return wlr_egl_query_buffer(renderer->egl, buffer,
		EGL_TEXTURE_FORMAT, &format);
}

static bool wlr_gles2_read_pixels(struct wlr_renderer *renderer,
		enum wl_shm_format wl_fmt, uint32_t stride, uint32_t width,
		uint32_t height, uint32_t src_x, uint32_t src_y, uint32_t dst_x,
		uint32_t dst_y, void *data) {
	const struct pixel_format *fmt = gl_format_for_wl_format(wl_fmt);
	if (fmt == NULL) {
		wlr_log(L_ERROR, "Cannot read pixels: unsupported pixel format");
		return false;
	}

	// Make sure any pending drawing is finished before we try to read it
	glFinish();

	// Unfortunately GLES2 doesn't support GL_PACK_*, so we have to read
	// the lines out row by row
	unsigned char *p = data + dst_y * stride;
	for (size_t i = src_y; i < src_y + height; ++i) {
		glReadPixels(src_x, src_y + height - i - 1, width, 1, fmt->gl_format,
			fmt->gl_type, p + i * stride + dst_x * fmt->bpp / 8);
	}

	return true;
}

static bool wlr_gles2_format_supported(struct wlr_renderer *r,
		enum wl_shm_format wl_fmt) {
	return gl_format_for_wl_format(wl_fmt);
}

static struct wlr_renderer_impl wlr_renderer_impl = {
	.begin = wlr_gles2_begin,
	.end = wlr_gles2_end,
	.clear = wlr_gles2_clear,
	.scissor = wlr_gles2_scissor,
	.texture_create = wlr_gles2_texture_create,
	.render_with_matrix = wlr_gles2_render_texture,
	.render_quad = wlr_gles2_render_quad,
	.render_ellipse = wlr_gles2_render_ellipse,
	.formats = wlr_gles2_formats,
	.buffer_is_drm = wlr_gles2_buffer_is_drm,
	.read_pixels = wlr_gles2_read_pixels,
	.format_supported = wlr_gles2_format_supported,
};

struct wlr_renderer *wlr_gles2_renderer_create(struct wlr_backend *backend) {
	init_globals();
	struct wlr_gles2_renderer *renderer;
	if (!(renderer = calloc(1, sizeof(struct wlr_gles2_renderer)))) {
		return NULL;
	}
	wlr_renderer_init(&renderer->wlr_renderer, &wlr_renderer_impl);

	renderer->egl = wlr_backend_get_egl(backend);

	return &renderer->wlr_renderer;
}