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authorBrian Paul <brianp@vmware.com>2010-05-27 09:24:43 -0600
committerBrian Paul <brianp@vmware.com>2010-05-27 09:40:33 -0600
commitb6187057be07a9652e807e2cfab872eb410c1fa7 (patch)
treecdf28c73579565900eefa55d2bb9b210ee56e96b /src/mesa/vbo
parentf49a65628f2df9a4de052e9d204419aa5e9812c9 (diff)
vbo: update/add comments
Diffstat (limited to 'src/mesa/vbo')
-rw-r--r--src/mesa/vbo/vbo_exec_array.c77
1 files changed, 62 insertions, 15 deletions
diff --git a/src/mesa/vbo/vbo_exec_array.c b/src/mesa/vbo/vbo_exec_array.c
index d4dbc8d256..775645ffee 100644
--- a/src/mesa/vbo/vbo_exec_array.c
+++ b/src/mesa/vbo/vbo_exec_array.c
@@ -40,7 +40,8 @@
/**
- * Compute min and max elements for glDraw[Range]Elements() calls.
+ * Compute min and max elements by scanning the index buffer for
+ * glDraw[Range]Elements() calls.
*/
void
vbo_get_minmax_index(GLcontext *ctx,
@@ -112,6 +113,7 @@ vbo_get_minmax_index(GLcontext *ctx,
/**
* Check that element 'j' of the array has reasonable data.
* Map VBO if needed.
+ * For debugging purposes; not normally used.
*/
static void
check_array_data(GLcontext *ctx, struct gl_client_array *array,
@@ -172,6 +174,7 @@ unmap_array_buffer(GLcontext *ctx, struct gl_client_array *array)
/**
* Examine the array's data for NaNs, etc.
+ * For debug purposes; not normally used.
*/
static void
check_draw_elements_data(GLcontext *ctx, GLsizei count, GLenum elemType,
@@ -249,7 +252,7 @@ check_draw_arrays_data(GLcontext *ctx, GLint start, GLsizei count)
/**
- * Print info/data for glDrawArrays().
+ * Print info/data for glDrawArrays(), for debugging.
*/
static void
print_draw_arrays(GLcontext *ctx, struct vbo_exec_context *exec,
@@ -295,6 +298,9 @@ print_draw_arrays(GLcontext *ctx, struct vbo_exec_context *exec,
/**
+ * Bind the VBO executor to the current vertex array object prior
+ * to drawing.
+ *
* Just translate the arrayobj into a sane layout.
*/
static void
@@ -334,6 +340,14 @@ bind_array_obj(GLcontext *ctx)
}
+/**
+ * Set the vbo->exec->inputs[] pointers to point to the enabled
+ * vertex arrays. This depends on the current vertex program/shader
+ * being executed because of whether or not generic vertex arrays
+ * alias the conventional vertex arrays.
+ * For arrays that aren't enabled, we set the input[attrib] pointer
+ * to point at a zero-stride current value "array".
+ */
static void
recalculate_input_bindings(GLcontext *ctx)
{
@@ -470,10 +484,9 @@ bind_arrays(GLcontext *ctx)
-/***********************************************************************
- * API functions.
+/**
+ * Called from glDrawArrays when in immediate mode (not display list mode).
*/
-
static void GLAPIENTRY
vbo_exec_DrawArrays(GLenum mode, GLint start, GLsizei count)
{
@@ -533,6 +546,10 @@ vbo_exec_DrawArrays(GLenum mode, GLint start, GLsizei count)
}
+/**
+ * Called from glDrawArraysInstanced when in immediate mode (not
+ * display list mode).
+ */
static void GLAPIENTRY
vbo_exec_DrawArraysInstanced(GLenum mode, GLint start, GLsizei count,
GLsizei primcount)
@@ -591,6 +608,7 @@ vbo_exec_DrawArraysInstanced(GLenum mode, GLint start, GLsizei count,
/**
* Map GL_ELEMENT_ARRAY_BUFFER and print contents.
+ * For debugging.
*/
static void
dump_element_buffer(GLcontext *ctx, GLenum type)
@@ -645,7 +663,11 @@ dump_element_buffer(GLcontext *ctx, GLenum type)
}
-/* Inner support for both _mesa_DrawElements and _mesa_DrawRangeElements */
+/**
+ * Inner support for both _mesa_DrawElements and _mesa_DrawRangeElements.
+ * Do the rendering for a glDrawElements or glDrawRangeElements call after
+ * we've validated buffer bounds, etc.
+ */
static void
vbo_validated_drawrangeelements(GLcontext *ctx, GLenum mode,
GLboolean index_bounds_valid,
@@ -722,6 +744,10 @@ vbo_validated_drawrangeelements(GLcontext *ctx, GLenum mode,
index_bounds_valid, start, end );
}
+
+/**
+ * Called by glDrawRangeElementsBaseVertex() in immediate mode.
+ */
static void GLAPIENTRY
vbo_exec_DrawRangeElementsBaseVertex(GLenum mode,
GLuint start, GLuint end,
@@ -831,6 +857,9 @@ vbo_exec_DrawRangeElementsBaseVertex(GLenum mode,
}
+/**
+ * Called by glDrawRangeElements() in immediate mode.
+ */
static void GLAPIENTRY
vbo_exec_DrawRangeElements(GLenum mode, GLuint start, GLuint end,
GLsizei count, GLenum type, const GLvoid *indices)
@@ -848,6 +877,9 @@ vbo_exec_DrawRangeElements(GLenum mode, GLuint start, GLuint end,
}
+/**
+ * Called by glDrawElements() in immediate mode.
+ */
static void GLAPIENTRY
vbo_exec_DrawElements(GLenum mode, GLsizei count, GLenum type,
const GLvoid *indices)
@@ -867,6 +899,9 @@ vbo_exec_DrawElements(GLenum mode, GLsizei count, GLenum type,
}
+/**
+ * Called by glDrawElementsBaseVertex() in immediate mode.
+ */
static void GLAPIENTRY
vbo_exec_DrawElementsBaseVertex(GLenum mode, GLsizei count, GLenum type,
const GLvoid *indices, GLint basevertex)
@@ -887,6 +922,9 @@ vbo_exec_DrawElementsBaseVertex(GLenum mode, GLsizei count, GLenum type,
}
+/**
+ * Called by glDrawElementsInstanced() in immediate mode.
+ */
static void GLAPIENTRY
vbo_exec_DrawElementsInstanced(GLenum mode, GLsizei count, GLenum type,
const GLvoid *indices, GLsizei primcount)
@@ -907,7 +945,11 @@ vbo_exec_DrawElementsInstanced(GLenum mode, GLsizei count, GLenum type,
}
-/** Inner support for both _mesa_DrawElements and _mesa_DrawRangeElements */
+/**
+ * Inner support for both _mesa_MultiDrawElements() and
+ * _mesa_MultiDrawRangeElements().
+ * This does the actual rendering after we've checked array indexes, etc.
+ */
static void
vbo_validated_multidrawelements(GLcontext *ctx, GLenum mode,
const GLsizei *count, GLenum type,
@@ -939,7 +981,8 @@ vbo_validated_multidrawelements(GLcontext *ctx, GLenum mode,
}
/* Decide if we can do this all as one set of primitives sharing the
- * same index buffer, or if we have to reset the index pointer per primitive.
+ * same index buffer, or if we have to reset the index pointer per
+ * primitive.
*/
bind_arrays( ctx );
@@ -1089,10 +1132,10 @@ vbo_exec_MultiDrawElementsBaseVertex(GLenum mode,
}
-/***********************************************************************
- * Initialization
+/**
+ * Plug in the immediate-mode vertex array drawing commands into the
+ * givven vbo_exec_context object.
*/
-
void
vbo_exec_array_init( struct vbo_exec_context *exec )
{
@@ -1125,7 +1168,13 @@ vbo_exec_array_destroy( struct vbo_exec_context *exec )
}
-/* This API entrypoint is not ordinarily used */
+
+/**
+ * The following functions are only used for OpenGL ES 1/2 support.
+ * And some aren't even supported (yet) in ES 1/2.
+ */
+
+
void GLAPIENTRY
_mesa_DrawArrays(GLenum mode, GLint first, GLsizei count)
{
@@ -1133,7 +1182,6 @@ _mesa_DrawArrays(GLenum mode, GLint first, GLsizei count)
}
-/* This API entrypoint is not ordinarily used */
void GLAPIENTRY
_mesa_DrawElements(GLenum mode, GLsizei count, GLenum type,
const GLvoid *indices)
@@ -1141,6 +1189,7 @@ _mesa_DrawElements(GLenum mode, GLsizei count, GLenum type,
vbo_exec_DrawElements(mode, count, type, indices);
}
+
void GLAPIENTRY
_mesa_DrawElementsBaseVertex(GLenum mode, GLsizei count, GLenum type,
const GLvoid *indices, GLint basevertex)
@@ -1149,7 +1198,6 @@ _mesa_DrawElementsBaseVertex(GLenum mode, GLsizei count, GLenum type,
}
-/* This API entrypoint is not ordinarily used */
void GLAPIENTRY
_mesa_DrawRangeElements(GLenum mode, GLuint start, GLuint end, GLsizei count,
GLenum type, const GLvoid *indices)
@@ -1168,7 +1216,6 @@ _mesa_DrawRangeElementsBaseVertex(GLenum mode, GLuint start, GLuint end,
}
-/* GL_EXT_multi_draw_arrays */
void GLAPIENTRY
_mesa_MultiDrawElementsEXT(GLenum mode, const GLsizei *count, GLenum type,
const GLvoid **indices, GLsizei primcount)