clients/simple-dmabuf-egl: Render a moving square
Render a moving square instead of just clearing the buffer, to help uncover rendering issues (e.g. modifier-related issues) which may not be visible with a simple glClear. Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
This commit is contained in:
Alexandros Frantzis
+2
-1
@@ -61,7 +61,8 @@ simple_clients = [
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],
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'dep_objs': [
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dep_wayland_client,
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dep_libdrm
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dep_libdrm,
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dep_libm
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],
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'deps': [ 'egl', 'glesv2', 'gbm' ]
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},
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+185
-37
@@ -37,6 +37,7 @@
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include <drm_fourcc.h>
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#include <xf86drm.h>
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@@ -125,6 +126,12 @@ struct window {
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struct wl_callback *callback;
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bool initialized;
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bool wait_for_configure;
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struct {
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GLuint program;
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GLuint pos;
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GLuint color;
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GLuint offset_uniform;
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} gl;
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};
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static sig_atomic_t running = 1;
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@@ -426,6 +433,117 @@ static const struct zxdg_toplevel_v6_listener xdg_toplevel_listener = {
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xdg_toplevel_handle_close,
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};
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static const char *vert_shader_text =
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"uniform float offset;\n"
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"attribute vec4 pos;\n"
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"attribute vec4 color;\n"
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"varying vec4 v_color;\n"
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"void main() {\n"
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" gl_Position = pos + vec4(offset, offset, 0.0, 0.0);\n"
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" v_color = color;\n"
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"}\n";
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static const char *frag_shader_text =
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"precision mediump float;\n"
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"varying vec4 v_color;\n"
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"void main() {\n"
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" gl_FragColor = v_color;\n"
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"}\n";
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static GLuint
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create_shader(const char *source, GLenum shader_type)
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{
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GLuint shader;
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GLint status;
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shader = glCreateShader(shader_type);
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assert(shader != 0);
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glShaderSource(shader, 1, (const char **) &source, NULL);
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glCompileShader(shader);
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glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
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if (!status) {
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char log[1000];
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GLsizei len;
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glGetShaderInfoLog(shader, 1000, &len, log);
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fprintf(stderr, "Error: compiling %s: %*s\n",
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shader_type == GL_VERTEX_SHADER ? "vertex" : "fragment",
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len, log);
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return 0;
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}
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return shader;
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}
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static GLuint
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create_and_link_program(GLuint vert, GLuint frag)
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{
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GLint status;
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GLuint program = glCreateProgram();
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glAttachShader(program, vert);
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glAttachShader(program, frag);
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glLinkProgram(program);
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glGetProgramiv(program, GL_LINK_STATUS, &status);
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if (!status) {
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char log[1000];
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GLsizei len;
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glGetProgramInfoLog(program, 1000, &len, log);
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fprintf(stderr, "Error: linking:\n%*s\n", len, log);
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return 0;
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}
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return program;
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}
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static bool
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window_set_up_gl(struct window *window)
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{
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GLuint vert = create_shader(vert_shader_text, GL_VERTEX_SHADER);
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GLuint frag = create_shader(frag_shader_text, GL_FRAGMENT_SHADER);
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window->gl.program = create_and_link_program(vert, frag);
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glDeleteShader(vert);
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glDeleteShader(frag);
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window->gl.pos = glGetAttribLocation(window->gl.program, "pos");
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window->gl.color = glGetAttribLocation(window->gl.program, "color");
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glUseProgram(window->gl.program);
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window->gl.offset_uniform =
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glGetUniformLocation(window->gl.program, "offset");
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return window->gl.program != 0;
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}
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static void
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destroy_window(struct window *window)
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{
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int i;
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if (window->gl.program)
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glDeleteProgram(window->gl.program);
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if (window->callback)
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wl_callback_destroy(window->callback);
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for (i = 0; i < NUM_BUFFERS; i++) {
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if (window->buffers[i].buffer)
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buffer_free(&window->buffers[i]);
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}
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if (window->xdg_toplevel)
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zxdg_toplevel_v6_destroy(window->xdg_toplevel);
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if (window->xdg_surface)
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zxdg_surface_v6_destroy(window->xdg_surface);
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wl_surface_destroy(window->surface);
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free(window);
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}
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static struct window *
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create_window(struct display *display, int width, int height)
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{
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@@ -486,31 +604,19 @@ create_window(struct display *display, int width, int height)
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width, height);
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if (ret < 0)
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return NULL;
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goto error;
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}
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if (!window_set_up_gl(window))
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goto error;
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return window;
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}
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static void
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destroy_window(struct window *window)
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{
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int i;
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error:
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if (window)
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destroy_window(window);
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if (window->callback)
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wl_callback_destroy(window->callback);
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for (i = 0; i < NUM_BUFFERS; i++) {
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if (window->buffers[i].buffer)
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buffer_free(&window->buffers[i]);
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}
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if (window->xdg_toplevel)
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zxdg_toplevel_v6_destroy(window->xdg_toplevel);
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if (window->xdg_surface)
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zxdg_surface_v6_destroy(window->xdg_surface);
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wl_surface_destroy(window->surface);
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free(window);
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return NULL;
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}
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static struct buffer *
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@@ -527,13 +633,67 @@ window_next_buffer(struct window *window)
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static const struct wl_callback_listener frame_listener;
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/* Renders a square moving from the lower left corner to the
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* upper right corner of the window. The square's vertices have
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* the following colors:
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*
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* green +-----+ yellow
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* | |
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* | |
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* red +-----+ blue
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*/
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static void
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render(struct window *window, struct buffer *buffer)
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{
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/* Complete a movement iteration in 5000 ms. */
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static const uint64_t iteration_ms = 5000;
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static const GLfloat verts[4][2] = {
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{ -0.5, -0.5 },
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{ -0.5, 0.5 },
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{ 0.5, -0.5 },
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{ 0.5, 0.5 }
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};
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static const GLfloat colors[4][3] = {
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{ 1, 0, 0 },
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{ 0, 1, 0 },
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{ 0, 0, 1 },
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{ 1, 1, 0 }
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};
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GLfloat offset;
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struct timeval tv;
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uint64_t time_ms;
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gettimeofday(&tv, NULL);
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time_ms = tv.tv_sec * 1000 + tv.tv_usec / 1000;
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/* Split time_ms in repeating windows of [0, iteration_ms) and map them
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* to offsets in the [-0.5, 0.5) range. */
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offset = (time_ms % iteration_ms) / (float) iteration_ms - 0.5;
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/* Direct all GL draws to the buffer through the FBO */
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glBindFramebuffer(GL_FRAMEBUFFER, buffer->gl_fbo);
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glViewport(0, 0, window->width, window->height);
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glUniform1f(window->gl.offset_uniform, offset);
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glClearColor(0.0,0.0, 0.0, 1.0);
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glClear(GL_COLOR_BUFFER_BIT);
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glVertexAttribPointer(window->gl.pos, 2, GL_FLOAT, GL_FALSE, 0, verts);
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glVertexAttribPointer(window->gl.color, 3, GL_FLOAT, GL_FALSE, 0, colors);
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glEnableVertexAttribArray(window->gl.pos);
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glEnableVertexAttribArray(window->gl.color);
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glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
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glDisableVertexAttribArray(window->gl.pos);
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glDisableVertexAttribArray(window->gl.color);
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}
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static void
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redraw(void *data, struct wl_callback *callback, uint32_t time)
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{
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/* With a 60Hz redraw rate this completes a cycle in 3 seconds */
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static const int MAX_STEP = 180;
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static int step = 0;
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static int step_dir = 1;
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struct window *window = data;
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struct buffer *buffer;
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@@ -545,19 +705,7 @@ redraw(void *data, struct wl_callback *callback, uint32_t time)
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abort();
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}
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/* Direct all GL draws to the buffer through the FBO */
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glBindFramebuffer(GL_FRAMEBUFFER, buffer->gl_fbo);
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/* Cycle between 0 and MAX_STEP */
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step += step_dir;
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if (step == 0 || step == MAX_STEP)
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step_dir = -step_dir;
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glClearColor(0.0,
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(float) step / MAX_STEP,
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1.0 - (float) step / MAX_STEP,
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1.0);
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glClear(GL_COLOR_BUFFER_BIT);
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render(window, buffer);
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glFinish();
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wl_surface_attach(window->surface, buffer->buffer, 0, 0);
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