First attempt at getting egl support up on dumb framebuffer.

Seems to be mostly working. Not all of egl API is implemented.

1 files changed, 318 insertions, 13 deletions

diff --git a/src/egl/main/eglconfig.c b/src/egl/main/eglconfig.c
index 0fb7e260723..ff9a647a8fc 100644
--- a/src/egl/main/eglconfig.c
+++ b/src/egl/main/eglconfig.c
@@ -1,4 +1,5 @@
 #include <stdlib.h>
+#include <stdio.h>
 #include <string.h>
 #include <assert.h>
 #include "eglconfig.h"
@@ -19,19 +20,19 @@ _eglInitConfig(_EGLConfig *config, EGLint id)
 {
    memset(config, 0, sizeof(*config));
    config->Handle = id;
-   SET_CONFIG_ATTRIB(config, EGL_CONFIG_ID,               id);
-   SET_CONFIG_ATTRIB(config, EGL_BIND_TO_TEXTURE_RGB,     EGL_DONT_CARE);
-   SET_CONFIG_ATTRIB(config, EGL_BIND_TO_TEXTURE_RGBA,    EGL_DONT_CARE);
-   SET_CONFIG_ATTRIB(config, EGL_CONFIG_CAVEAT,           EGL_DONT_CARE);
-   SET_CONFIG_ATTRIB(config, EGL_NATIVE_RENDERABLE,       EGL_DONT_CARE);
-   SET_CONFIG_ATTRIB(config, EGL_NATIVE_VISUAL_TYPE,      EGL_DONT_CARE);
-   SET_CONFIG_ATTRIB(config, EGL_MIN_SWAP_INTERVAL,       EGL_DONT_CARE);
-   SET_CONFIG_ATTRIB(config, EGL_MAX_SWAP_INTERVAL,       EGL_DONT_CARE);
-   SET_CONFIG_ATTRIB(config, EGL_SURFACE_TYPE,            EGL_WINDOW_BIT);
-   SET_CONFIG_ATTRIB(config, EGL_TRANSPARENT_TYPE,        EGL_NONE);
-   SET_CONFIG_ATTRIB(config, EGL_TRANSPARENT_RED_VALUE,   EGL_DONT_CARE);
-   SET_CONFIG_ATTRIB(config, EGL_TRANSPARENT_GREEN_VALUE, EGL_DONT_CARE);
-   SET_CONFIG_ATTRIB(config, EGL_TRANSPARENT_BLUE_VALUE,  EGL_DONT_CARE);
+   _eglSetConfigAtrib(config, EGL_CONFIG_ID,               id);
+   _eglSetConfigAtrib(config, EGL_BIND_TO_TEXTURE_RGB,     EGL_DONT_CARE);
+   _eglSetConfigAtrib(config, EGL_BIND_TO_TEXTURE_RGBA,    EGL_DONT_CARE);
+   _eglSetConfigAtrib(config, EGL_CONFIG_CAVEAT,           EGL_DONT_CARE);
+   _eglSetConfigAtrib(config, EGL_NATIVE_RENDERABLE,       EGL_DONT_CARE);
+   _eglSetConfigAtrib(config, EGL_NATIVE_VISUAL_TYPE,      EGL_DONT_CARE);
+   _eglSetConfigAtrib(config, EGL_MIN_SWAP_INTERVAL,       EGL_DONT_CARE);
+   _eglSetConfigAtrib(config, EGL_MAX_SWAP_INTERVAL,       EGL_DONT_CARE);
+   _eglSetConfigAtrib(config, EGL_SURFACE_TYPE,            EGL_WINDOW_BIT);
+   _eglSetConfigAtrib(config, EGL_TRANSPARENT_TYPE,        EGL_NONE);
+   _eglSetConfigAtrib(config, EGL_TRANSPARENT_RED_VALUE,   EGL_DONT_CARE);
+   _eglSetConfigAtrib(config, EGL_TRANSPARENT_GREEN_VALUE, EGL_DONT_CARE);
+   _eglSetConfigAtrib(config, EGL_TRANSPARENT_BLUE_VALUE,  EGL_DONT_CARE);
 }
 
 
@@ -77,6 +78,79 @@ _eglAddConfig(_EGLDisplay *display, const _EGLConfig *config)
 }
 
 
+extern void
+_eglSetConfigAtrib(_EGLConfig *config, EGLint attr, EGLint val)
+{
+   config->Attrib[attr - FIRST_ATTRIB] = val;
+   
+   switch (attr) {
+   case EGL_BUFFER_SIZE:
+      config->glmode.rgbBits = val;
+      break;
+   case EGL_ALPHA_SIZE:
+      config->glmode.alphaBits = val;
+      break;
+   case EGL_BLUE_SIZE:
+      config->glmode.blueBits = val;
+      break;
+   case EGL_GREEN_SIZE:
+      config->glmode.greenBits = val;
+      break;
+   case EGL_RED_SIZE:
+      config->glmode.redBits = val;
+      break;
+   case EGL_DEPTH_SIZE:
+      config->glmode.depthBits = val;
+      break;
+   case EGL_STENCIL_SIZE:
+      config->glmode.stencilBits = val;
+      break;
+   case EGL_CONFIG_CAVEAT:
+      break;
+   case EGL_CONFIG_ID:
+      break;
+   case EGL_LEVEL:
+      break;
+   case EGL_MAX_PBUFFER_HEIGHT:
+      break;
+   case EGL_MAX_PBUFFER_PIXELS:
+      break;
+   case EGL_MAX_PBUFFER_WIDTH:
+      break;
+   case EGL_NATIVE_RENDERABLE:
+      break;
+   case EGL_NATIVE_VISUAL_ID:
+      break;
+   case EGL_NATIVE_VISUAL_TYPE:
+      break;
+   case EGL_SAMPLES:
+      break;
+   case EGL_SAMPLE_BUFFERS:
+      break;
+   case EGL_SURFACE_TYPE:
+      break;
+   case EGL_TRANSPARENT_TYPE:
+      break;
+   case EGL_TRANSPARENT_BLUE_VALUE:
+      break;
+   case EGL_TRANSPARENT_GREEN_VALUE:
+      break;
+   case EGL_TRANSPARENT_RED_VALUE:
+      break;
+   case EGL_NONE:
+      break;
+   case EGL_BIND_TO_TEXTURE_RGB:
+      break;
+   case EGL_BIND_TO_TEXTURE_RGBA:
+      break;
+   case EGL_MIN_SWAP_INTERVAL:
+      break;
+   case EGL_MAX_SWAP_INTERVAL:
+      break;
+   default:
+      break;
+   }
+}
 
 /**
  * Parse the attrib_list to fill in the fields of the given _egl_config
@@ -310,3 +384,234 @@ _eglGetConfigs(_EGLDriver *drv, EGLDisplay dpy, EGLConfig *configs, EGLint confi
    }
    return EGL_TRUE;
 }
+
+
+/**
+ * Creates a set of \c __GLcontextModes that a driver will expose.
+ * 
+ * A set of \c __GLcontextModes will be created based on the supplied
+ * parameters.  The number of modes processed will be 2 *
+ * \c num_depth_stencil_bits * \c num_db_modes.
+ * 
+ * For the most part, data is just copied from \c depth_bits, \c stencil_bits,
+ * \c db_modes, and \c visType into each \c __GLcontextModes element.
+ * However, the meanings of \c fb_format and \c fb_type require further
+ * explanation.  The \c fb_format specifies which color components are in
+ * each pixel and what the default order is.  For example, \c GL_RGB specifies
+ * that red, green, blue are available and red is in the "most significant"
+ * position and blue is in the "least significant".  The \c fb_type specifies
+ * the bit sizes of each component and the actual ordering.  For example, if
+ * \c GL_UNSIGNED_SHORT_5_6_5_REV is specified with \c GL_RGB, bits [15:11]
+ * are the blue value, bits [10:5] are the green value, and bits [4:0] are
+ * the red value.
+ * 
+ * One sublte issue is the combination of \c GL_RGB  or \c GL_BGR and either
+ * of the \c GL_UNSIGNED_INT_8_8_8_8 modes.  The resulting mask values in the
+ * \c __GLcontextModes structure is \b identical to the \c GL_RGBA or
+ * \c GL_BGRA case, except the \c alphaMask is zero.  This means that, as
+ * far as this routine is concerned, \c GL_RGB with \c GL_UNSIGNED_INT_8_8_8_8
+ * still uses 32-bits.
+ *
+ * If in doubt, look at the tables used in the function.
+ * 
+ * \param ptr_to_modes  Pointer to a pointer to a linked list of
+ *                      \c __GLcontextModes.  Upon completion, a pointer to
+ *                      the next element to be process will be stored here.
+ *                      If the function fails and returns \c GL_FALSE, this
+ *                      value will be unmodified, but some elements in the
+ *                      linked list may be modified.
+ * \param fb_format     Format of the framebuffer.  Currently only \c GL_RGB,
+ *                      \c GL_RGBA, \c GL_BGR, and \c GL_BGRA are supported.
+ * \param fb_type       Type of the pixels in the framebuffer.  Currently only
+ *                      \c GL_UNSIGNED_SHORT_5_6_5, 
+ *                      \c GL_UNSIGNED_SHORT_5_6_5_REV,
+ *                      \c GL_UNSIGNED_INT_8_8_8_8, and
+ *                      \c GL_UNSIGNED_INT_8_8_8_8_REV are supported.
+ * \param depth_bits    Array of depth buffer sizes to be exposed.
+ * \param stencil_bits  Array of stencil buffer sizes to be exposed.
+ * \param num_depth_stencil_bits  Number of entries in both \c depth_bits and
+ *                      \c stencil_bits.
+ * \param db_modes      Array of buffer swap modes.  If an element has a
+ *                      value of \c GLX_NONE, then it represents a
+ *                      single-buffered mode.  Other valid values are
+ *                      \c GLX_SWAP_EXCHANGE_OML, \c GLX_SWAP_COPY_OML, and
+ *                      \c GLX_SWAP_UNDEFINED_OML.  See the
+ *                      GLX_OML_swap_method extension spec for more details.
+ * \param num_db_modes  Number of entries in \c db_modes.
+ * \param visType       GLX visual type.  Usually either \c GLX_TRUE_COLOR or
+ *                      \c GLX_DIRECT_COLOR.
+ * 
+ * \returns
+ * \c GL_TRUE on success or \c GL_FALSE on failure.  Currently the only
+ * cause of failure is a bad parameter (i.e., unsupported \c fb_format or
+ * \c fb_type).
+ * 
+ * \todo
+ * There is currently no way to support packed RGB modes (i.e., modes with
+ * exactly 3 bytes per pixel) or floating-point modes.  This could probably
+ * be done by creating some new, private enums with clever names likes
+ * \c GL_UNSIGNED_3BYTE_8_8_8, \c GL_4FLOAT_32_32_32_32, 
+ * \c GL_4HALF_16_16_16_16, etc.  We can cross that bridge when we come to it.
+ */
+GLboolean
+_eglFillInConfigs(_EGLConfig * configs,
+                GLenum fb_format, GLenum fb_type,
+                const u_int8_t * depth_bits, const u_int8_t * stencil_bits,
+                unsigned num_depth_stencil_bits,
+                const GLenum * db_modes, unsigned num_db_modes,
+                int visType) {
+   static const u_int8_t bits_table[3][4] = {
+            /* R  G  B  A */
+            { 5, 6, 5, 0 },  /* Any GL_UNSIGNED_SHORT_5_6_5 */
+            { 8, 8, 8, 0 },  /* Any RGB with any GL_UNSIGNED_INT_8_8_8_8 */
+            { 8, 8, 8, 8 }  /* Any RGBA with any GL_UNSIGNED_INT_8_8_8_8 */
+         };
+
+   /* The following arrays are all indexed by the fb_type masked with 0x07.
+    * Given the four supported fb_type values, this results in valid array
+    * indices of 3, 4, 5, and 7.
+    */
+   static const u_int32_t masks_table_rgb[8][4] = {
+            {0x00000000, 0x00000000, 0x00000000, 0x00000000},
+            {0x00000000, 0x00000000, 0x00000000, 0x00000000},
+            {0x00000000, 0x00000000, 0x00000000, 0x00000000},
+            {0x0000F800, 0x000007E0, 0x0000001F, 0x00000000},  /* 5_6_5       */
+            {0x0000001F, 0x000007E0, 0x0000F800, 0x00000000},  /* 5_6_5_REV   */
+            {0xFF000000, 0x00FF0000, 0x0000FF00, 0x00000000},  /* 8_8_8_8     */
+            {0x00000000, 0x00000000, 0x00000000, 0x00000000},
+            {0x000000FF, 0x0000FF00, 0x00FF0000, 0x00000000}  /* 8_8_8_8_REV */
+         };
+
+   static const u_int32_t masks_table_rgba[8][4] = {
+            {0x00000000, 0x00000000, 0x00000000, 0x00000000},
+            {0x00000000, 0x00000000, 0x00000000, 0x00000000},
+            {0x00000000, 0x00000000, 0x00000000, 0x00000000},
+            {0x0000F800, 0x000007E0, 0x0000001F, 0x00000000},  /* 5_6_5       */
+            {0x0000001F, 0x000007E0, 0x0000F800, 0x00000000},  /* 5_6_5_REV   */
+            {0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF},  /* 8_8_8_8     */
+            {0x00000000, 0x00000000, 0x00000000, 0x00000000},
+            {0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000},  /* 8_8_8_8_REV */
+         };
+
+   static const u_int32_t masks_table_bgr[8][4] = {
+            {0x00000000, 0x00000000, 0x00000000, 0x00000000},
+            {0x00000000, 0x00000000, 0x00000000, 0x00000000},
+            {0x00000000, 0x00000000, 0x00000000, 0x00000000},
+            {0x0000001F, 0x000007E0, 0x0000F800, 0x00000000},  /* 5_6_5       */
+            {0x0000F800, 0x000007E0, 0x0000001F, 0x00000000},  /* 5_6_5_REV   */
+            {0x0000FF00, 0x00FF0000, 0xFF000000, 0x00000000},  /* 8_8_8_8     */
+            {0x00000000, 0x00000000, 0x00000000, 0x00000000},
+            {0x00FF0000, 0x0000FF00, 0x000000FF, 0x00000000},  /* 8_8_8_8_REV */
+         };
+
+   static const u_int32_t masks_table_bgra[8][4] = {
+            {0x00000000, 0x00000000, 0x00000000, 0x00000000},
+            {0x00000000, 0x00000000, 0x00000000, 0x00000000},
+            {0x00000000, 0x00000000, 0x00000000, 0x00000000},
+            {0x0000001F, 0x000007E0, 0x0000F800, 0x00000000},  /* 5_6_5       */
+            {0x0000F800, 0x000007E0, 0x0000001F, 0x00000000},  /* 5_6_5_REV   */
+            {0x0000FF00, 0x00FF0000, 0xFF000000, 0x000000FF},  /* 8_8_8_8     */
+            {0x00000000, 0x00000000, 0x00000000, 0x00000000},
+            {0x00FF0000, 0x0000FF00, 0x000000FF, 0xFF000000},  /* 8_8_8_8_REV */
+         };
+
+   static const u_int8_t bytes_per_pixel[8] = {
+            0, 0, 0, 2, 2, 4, 0, 4
+         };
+
+   const u_int8_t * bits;
+   const u_int32_t * masks;
+   const int index = fb_type & 0x07;
+   _EGLConfig *config;
+   unsigned i;
+   unsigned j;
+   unsigned k;
+
+   if ( bytes_per_pixel[index] == 0 ) {
+      fprintf(stderr, "[%s:%u] Framebuffer type 0x%04x has 0 bytes per pixel.\n",
+               __FUNCTION__, __LINE__, fb_type);
+      return GL_FALSE;
+   }
+
+   /* Valid types are GL_UNSIGNED_SHORT_5_6_5 and GL_UNSIGNED_INT_8_8_8_8 and
+    * the _REV versions.
+    *
+    * Valid formats are GL_RGBA, GL_RGB, and GL_BGRA.
+    */
+   switch ( fb_format ) {
+   case GL_RGB:
+      bits = (bytes_per_pixel[index] == 2) ? bits_table[0] : bits_table[1];
+      masks = masks_table_rgb[index];
+      break;
+
+   case GL_RGBA:
+      bits = (bytes_per_pixel[index] == 2) ? bits_table[0] : bits_table[2];
+      masks = masks_table_rgba[index];
+      break;
+
+   case GL_BGR:
+      bits = (bytes_per_pixel[index] == 2) ? bits_table[0] : bits_table[1];
+      masks = masks_table_bgr[index];
+      break;
+
+   case GL_BGRA:
+      bits = (bytes_per_pixel[index] == 2) ? bits_table[0] : bits_table[2];
+      masks = masks_table_bgra[index];
+      break;
+
+   default:
+      fprintf(stderr, "[%s:%u] Framebuffer format 0x%04x is not GL_RGB, GL_RGBA, GL_BGR, or GL_BGRA.\n",
+               __FUNCTION__, __LINE__, fb_format);
+      return GL_FALSE;
+   }
+
+   config = configs;
+   for (k = 0; k < num_depth_stencil_bits; k++) {
+      for (i = 0; i < num_db_modes; i++)  {
+         for (j = 0; j < 2; j++) {
+
+            _eglSetConfigAtrib(config, EGL_RED_SIZE, bits[0]);
+            _eglSetConfigAtrib(config, EGL_GREEN_SIZE, bits[1]);
+            _eglSetConfigAtrib(config, EGL_BLUE_SIZE, bits[2]);
+            _eglSetConfigAtrib(config, EGL_ALPHA_SIZE, bits[3]);
+            config->glmode.redMask = masks[0];
+            config->glmode.greenMask = masks[1];
+            config->glmode.blueMask = masks[2];
+            config->glmode.alphaMask = masks[3];
+            _eglSetConfigAtrib(config, EGL_BUFFER_SIZE, config->glmode.redBits + config->glmode.greenBits
+                                + config->glmode.blueBits + config->glmode.alphaBits);
+
+            config->glmode.accumRedBits = 16 * j;
+            config->glmode.accumGreenBits = 16 * j;
+            config->glmode.accumBlueBits = 16 * j;
+            config->glmode.accumAlphaBits = (masks[3] != 0) ? 16 * j : 0;
+            config->glmode.visualRating = (j == 0) ? GLX_NONE : GLX_SLOW_CONFIG;
+
+            _eglSetConfigAtrib(config, EGL_STENCIL_SIZE, stencil_bits[k]);
+            _eglSetConfigAtrib(config, EGL_DEPTH_SIZE, depth_bits[k]);
+
+            config->glmode.visualType = visType;
+            config->glmode.renderType = GLX_RGBA_BIT;
+            config->glmode.drawableType = GLX_WINDOW_BIT;
+            config->glmode.rgbMode = GL_TRUE;
+
+            if (db_modes[i] == GLX_NONE) {
+               config->glmode.doubleBufferMode = GL_FALSE;
+            } else {
+               config->glmode.doubleBufferMode = GL_TRUE;
+               config->glmode.swapMethod = db_modes[i];
+            }
+
+            config->glmode.haveAccumBuffer = ((config->glmode.accumRedBits +
+                                                 config->glmode.accumGreenBits +
+                                                 config->glmode.accumBlueBits +
+                                                 config->glmode.accumAlphaBits) > 0);
+            config->glmode.haveDepthBuffer = (config->glmode.depthBits > 0);
+            config->glmode.haveStencilBuffer = (config->glmode.stencilBits > 0);
+
+            config++;
+         }
+      }
+   }
+   return GL_TRUE;
+}