[egl] added basic shaders and use dma to xfer buffer to the gpu

client/renderers/egl.c

@@ -25,13 +25,16 @@ Place, Suite 330, Boston, MA 02111-1307 USA
 
 #include "egl_model.h"
 #include "egl_shader.h"
+#include "egl_shader_progs.h"
 
 struct Options
 {
+  bool vsync;
 };
 
 static struct Options defaultOptions =
 {
+  .vsync = true
 };
 
 struct Models
@@ -226,14 +229,22 @@ bool egl_render_startup(void * opaque, SDL_Window * window)
     1.0f, 0.0f
   };
 
-  if (!egl_shader_init(&this->shaders.desktop)                     ) return false;
-  if (!egl_shader_load(this->shaders.desktop, "test.vs", "test.fs")) return false;
-  if (!egl_model_init(&this->models.desktop)                       ) return false;
+  if (!egl_shader_init(&this->shaders.desktop))
+    return false;
 
+  if (!egl_shader_compile(this->shaders.desktop,
+        egl_vertex_shader_basic, sizeof(egl_vertex_shader_basic),
+        egl_fragment_shader_bgra, sizeof(egl_fragment_shader_bgra)
+      ))
+    return false;
+
+  if (!egl_model_init(&this->models.desktop))
+    return false;
   egl_model_set_verticies(this->models.desktop, desktop, sizeof(desktop) / sizeof(GLfloat));
   egl_model_set_uvs      (this->models.desktop, uvs    , sizeof(uvs    ) / sizeof(GLfloat));
   egl_model_set_shader   (this->models.desktop, this->shaders.desktop);
 
+  eglSwapInterval(this->display, this->opt.vsync ? 1 : 0);
   return true;
 }
 
@@ -269,8 +280,23 @@ bool egl_render(void * opaque, SDL_Window * window)
   return true;
 }
 
+static void handle_opt_vsync(void * opaque, const char *value)
+{
+  struct Inst * this = (struct Inst *)opaque;
+  if (!this)
+    return;
+
+  this->opt.vsync = LG_RendererValueToBool(value);
+}
+
 static LG_RendererOpt egl_options[] =
 {
+  {
+    .name      = "vsync",
+    .desc      ="Enable or disable vsync [default: enabled]",
+    .validator = LG_RendererValidatorBool,
+    .handler   = handle_opt_vsync
+  }
 };
 
 struct LG_Renderer LGR_EGL =

client/renderers/egl_model.c

@@ -42,7 +42,7 @@ struct EGL_Model
   bool   hasTexture;
   GLuint texture;
 
-  bool   hasPBO, pboUpdate;
+  bool   hasPBO;
   GLuint pbo[2];
   int    pboIndex;
   size_t pboWidth, pboHeight;
@@ -105,7 +105,7 @@ bool egl_model_init_streaming(EGL_Model * model, size_t width, size_t height, si
       GL_PIXEL_UNPACK_BUFFER,
       bufferSize,
       NULL,
-      GL_STREAM_DRAW
+      GL_DYNAMIC_DRAW
     );
     glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
   }
@@ -124,24 +124,14 @@ bool egl_model_stream_buffer(EGL_Model * model, const uint8_t * buffer, size_t b
   if (++model->pboIndex == 2)
     model->pboIndex = 0;
 
+  glBindTexture(GL_TEXTURE_2D, egl_model_get_texture_id(model));
     glBindBuffer(GL_PIXEL_UNPACK_BUFFER, model->pbo[model->pboIndex]);
-  glBufferData(GL_PIXEL_UNPACK_BUFFER, bufferSize, 0, GL_STREAM_DRAW);
-  GLubyte * ptr = glMapBuffer(GL_PIXEL_UNPACK_BUFFER, GL_WRITE_ONLY);
-  if (!ptr)
-  {
-    DEBUG_ERROR("Failed to map the buffer");
-    glBindTexture(GL_TEXTURE_2D, 0);
+      glBufferData(GL_PIXEL_UNPACK_BUFFER, bufferSize, 0, GL_DYNAMIC_DRAW);
+      glBufferSubData(GL_PIXEL_UNPACK_BUFFER, 0, bufferSize, buffer);
+      glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, model->pboWidth, model->pboHeight, GL_RGBA, GL_UNSIGNED_BYTE, 0);
     glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
-    return false;
-  }
-
-  memcpy(ptr, buffer, bufferSize);
-
-  glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
   glBindTexture(GL_TEXTURE_2D, 0);
-  glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
 
-  model->pboUpdate = true;
   return true;
 }
 
@@ -210,14 +200,6 @@ void egl_model_render(EGL_Model * model)
 
   if (model->shader)
     glUseProgram(0);
-
-  if (model->pboUpdate)
-  {
-    glBindTexture(GL_TEXTURE_2D, egl_model_get_texture_id(model));
-    glBindBuffer(GL_PIXEL_UNPACK_BUFFER, model->pbo[model->pboIndex]);
-    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, model->pboWidth, model->pboHeight, GL_RGBA, GL_UNSIGNED_BYTE, 0);
-    model->pboUpdate = false;
-  }
 }
 
 void egl_model_set_shader(EGL_Model * model, EGL_Shader * shader)

client/renderers/egl_shader_progs.h

@@ -0,0 +1,71 @@
+/*
+Looking Glass - KVM FrameRelay (KVMFR) Client
+Copyright (C) 2017 Geoffrey McRae <geoff@hostfission.com>
+https://looking-glass.hostfission.com
+
+This program is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free Software
+Foundation; either version 2 of the License, or (at your option) any later
+version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#ifndef _EGL_SHADER_PROGS_H
+#define _EGL_SHADER_PROGS_H
+
+static const char egl_vertex_shader_basic[] = "\
+#version 300 es\n\
+\
+layout(location = 0) in vec3 vertexPosition_modelspace;\
+layout(location = 1) in vec2 vertexUV;\
+\
+out highp vec2 uv;\
+\
+void main()\
+{\
+  gl_Position.xyz = vertexPosition_modelspace;\
+  gl_Position.w   = 1.0;\
+\
+  uv = vertexUV;\
+}\
+";
+
+static const char egl_fragment_shader_rgba[] = "\
+#version 300 es\
+\
+in  highp vec2 uv;\
+out highp vec3 color;\
+\
+uniform sampler2D sampler;\
+ \
+void main()\
+{\
+  color = texture(sampler, uv).rgb;\
+}\
+";
+
+static const char egl_fragment_shader_bgra[] = "\
+#version 300 es\n\
+\
+in  highp vec2 uv;\
+out highp vec3 color;\
+\
+uniform sampler2D sampler;\
+\
+void main()\
+{\
+  highp vec3 tmp = texture(sampler, uv).rgb;\
+  color.r = tmp.b;\
+  color.g = tmp.g;\
+  color.b = tmp.r;\
+}\
+";
+
+#endif