Move some config-related utility functions into new eglconfigutil.c file.

1 files changed, 260 insertions, 0 deletions

diff --git a/src/egl/main/eglconfigutil.c b/src/egl/main/eglconfigutil.c
new file mode 100644
index 0000000000..b6585619a5
--- /dev/null
+++ b/src/egl/main/eglconfigutil.c
@@ -0,0 +1,260 @@
+/**
+ * Extra utility functions related to EGL configs.
+ */
+
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include "eglconfigutil.h"
+#include "egllog.h"
+
+
+/**
+ * Convert an _EGLConfig to a __GLcontextModes object.
+ * NOTE: This routine may be incomplete - we're only making sure that
+ * the fields needed by Mesa (for _mesa_create_context/framebuffer) are
+ * set correctly.
+ */
+void
+_eglConfigToContextModesRec(const _EGLConfig *config, __GLcontextModes *mode)
+{
+   memset(mode, 0, sizeof(*mode));
+
+   mode->rgbMode = GL_TRUE; /* no color index */
+   mode->colorIndexMode = GL_FALSE;
+   mode->doubleBufferMode = GL_TRUE;  /* always DB for now */
+   mode->stereoMode = GL_FALSE;
+
+   mode->redBits = GET_CONFIG_ATTRIB(config, EGL_RED_SIZE);
+   mode->greenBits = GET_CONFIG_ATTRIB(config, EGL_GREEN_SIZE);
+   mode->blueBits = GET_CONFIG_ATTRIB(config, EGL_BLUE_SIZE);
+   mode->alphaBits = GET_CONFIG_ATTRIB(config, EGL_ALPHA_SIZE);
+   mode->rgbBits = GET_CONFIG_ATTRIB(config, EGL_BUFFER_SIZE);
+
+   /* no rgba masks - fix? */
+
+   mode->depthBits = GET_CONFIG_ATTRIB(config, EGL_DEPTH_SIZE);
+   mode->haveDepthBuffer = mode->depthBits > 0;
+
+   mode->stencilBits = GET_CONFIG_ATTRIB(config, EGL_STENCIL_SIZE);
+   mode->haveStencilBuffer = mode->stencilBits > 0;
+
+   /* no accum */
+
+   mode->level = GET_CONFIG_ATTRIB(config, EGL_LEVEL);
+   mode->samples = GET_CONFIG_ATTRIB(config, EGL_SAMPLES);
+   mode->sampleBuffers = GET_CONFIG_ATTRIB(config, EGL_SAMPLE_BUFFERS);
+
+   /* surface type - not really needed */
+   mode->visualType = GLX_TRUE_COLOR;
+   mode->renderType = GLX_RGBA_BIT;
+}
+
+
+
+/**
+ * Creates a set of \c _EGLConfigs 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 configs       the array of configs generated
+ * \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.
+ */
+EGLBoolean
+_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)
+{
+#if 0
+   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 ) {
+      _eglLog(_EGL_INFO,
+              "[%s:%u] Framebuffer type 0x%04x has 0 bytes per pixel.",
+              __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:
+      _eglLog(_EGL_WARNING,
+              "[%s:%u] Framebuffer format 0x%04x is not GL_RGB, GL_RGBA, GL_BGR, or GL_BGRA.",
+              __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++) {
+            _eglSetConfigAttrib(config, EGL_RED_SIZE, bits[0]);
+            _eglSetConfigAttrib(config, EGL_GREEN_SIZE, bits[1]);
+            _eglSetConfigAttrib(config, EGL_BLUE_SIZE, bits[2]);
+            _eglSetConfigAttrib(config, EGL_ALPHA_SIZE, bits[3]);
+            _eglSetConfigAttrib(config, EGL_BUFFER_SIZE,
+                                bits[0] + bits[1] + bits[2] + bits[3]);
+
+            _eglSetConfigAttrib(config, EGL_STENCIL_SIZE, stencil_bits[k]);
+            _eglSetConfigAttrib(config, EGL_DEPTH_SIZE, depth_bits[i]);
+
+            _eglSetConfigAttrib(config, EGL_SURFACE_TYPE, EGL_SCREEN_BIT_MESA |
+                         EGL_PBUFFER_BIT | EGL_PIXMAP_BIT | EGL_WINDOW_BIT);
+
+            config++;
+         }
+      }
+   }
+   return GL_TRUE;
+#else
+   return GL_FALSE;
+#endif
+}
+