[Mesa-dev] [PATCH 12/18] mesa: add ARB_draw_indirect support to compat profile

[Marek Olšák]

On Thu, Jun 28, 2018 at 2:46 AM, Timothy Arceri <tarceri at itsqueeze.com> wrote:
> ---
>  src/mesa/main/bufferobj.c        |  3 +-
>  src/mesa/main/extensions_table.h |  2 +-
>  src/mesa/vbo/vbo_exec_array.c    | 66 +++++++++++++++++++++++++++++++-
>  3 files changed, 67 insertions(+), 4 deletions(-)
>
> diff --git a/src/mesa/main/bufferobj.c b/src/mesa/main/bufferobj.c
> index 67f9cd0a902..1d1e51bc015 100644
> --- a/src/mesa/main/bufferobj.c
> +++ b/src/mesa/main/bufferobj.c
> @@ -129,8 +129,7 @@ get_buffer_target(struct gl_context *ctx, GLenum target)
>           return &ctx->QueryBuffer;
>        break;
>     case GL_DRAW_INDIRECT_BUFFER:
> -      if ((ctx->API == API_OPENGL_CORE &&
> -           ctx->Extensions.ARB_draw_indirect) ||
> +      if ((_mesa_is_desktop_gl(ctx) && ctx->Extensions.ARB_draw_indirect) ||
>             _mesa_is_gles31(ctx)) {
>           return &ctx->DrawIndirectBuffer;
>        }
> diff --git a/src/mesa/main/extensions_table.h b/src/mesa/main/extensions_table.h
> index f79a52cee8c..1446a4bd421 100644
> --- a/src/mesa/main/extensions_table.h
> +++ b/src/mesa/main/extensions_table.h
> @@ -58,7 +58,7 @@ EXT(ARB_direct_state_access                 , dummy_true
>  EXT(ARB_draw_buffers                        , dummy_true                             , GLL, GLC,  x ,  x , 2002)
>  EXT(ARB_draw_buffers_blend                  , ARB_draw_buffers_blend                 , GLL, GLC,  x ,  x , 2009)
>  EXT(ARB_draw_elements_base_vertex           , ARB_draw_elements_base_vertex          , GLL, GLC,  x ,  x , 2009)
> -EXT(ARB_draw_indirect                       , ARB_draw_indirect                      ,  x , GLC,  x ,  x , 2010)
> +EXT(ARB_draw_indirect                       , ARB_draw_indirect                      , GLL, GLC,  x ,  x , 2010)
>  EXT(ARB_draw_instanced                      , ARB_draw_instanced                     , GLL, GLC,  x ,  x , 2008)
>  EXT(ARB_enhanced_layouts                    , ARB_enhanced_layouts                   , GLL, GLC,  x ,  x , 2013)
>  EXT(ARB_explicit_attrib_location            , ARB_explicit_attrib_location           , GLL, GLC,  x ,  x , 2009)
> diff --git a/src/mesa/vbo/vbo_exec_array.c b/src/mesa/vbo/vbo_exec_array.c
> index 792907ac044..0d92de2e3ad 100644
> --- a/src/mesa/vbo/vbo_exec_array.c
> +++ b/src/mesa/vbo/vbo_exec_array.c
> @@ -39,6 +39,21 @@
>  #include "main/macros.h"
>  #include "main/transformfeedback.h"
>
> +typedef struct {
> +   GLuint count;
> +   GLuint primCount;
> +   GLuint first;
> +   GLuint reservedMustBeZero;
> +} DrawArraysIndirectCommand;
> +
> +typedef struct {
> +   GLuint count;
> +   GLuint primCount;
> +   GLuint firstIndex;
> +   GLint  baseVertex;
> +   GLuint reservedMustBeZero;
> +} DrawElementsIndirectCommand;
> +

reservedMustBeZero is redefined by ARB_base_instance. I'm sure you'll
find out what needs to be changed here. :)

Marek

>
>  /**
>   * Check that element 'j' of the array has reasonable data.
> @@ -1616,6 +1631,20 @@ vbo_exec_DrawArraysIndirect(GLenum mode, const GLvoid *indirect)
>        _mesa_debug(ctx, "glDrawArraysIndirect(%s, %p)\n",
>                    _mesa_enum_to_string(mode), indirect);
>
> +   /* From the ARB_draw_indirect spec:
> +    *
> +    *    "Initially zero is bound to DRAW_INDIRECT_BUFFER. In the
> +    *    compatibility profile, this indicates that DrawArraysIndirect and
> +    *    DrawElementsIndirect are to source their arguments directly from the
> +    *    pointer passed as their <indirect> parameters."
> +    */
> +   if (ctx->API == API_OPENGL_COMPAT &&
> +       !_mesa_is_bufferobj(ctx->DrawIndirectBuffer)) {
> +      DrawArraysIndirectCommand *cmd = (DrawArraysIndirectCommand *) indirect;
> +      _mesa_DrawArraysInstanced(mode, cmd->first, cmd->count, cmd->primCount);
> +      return;
> +   }
> +
>     FLUSH_FOR_DRAW(ctx);
>
>     if (_mesa_is_no_error_enabled(ctx)) {
> @@ -1647,6 +1676,41 @@ vbo_exec_DrawElementsIndirect(GLenum mode, GLenum type, const GLvoid *indirect)
>                    _mesa_enum_to_string(mode),
>                    _mesa_enum_to_string(type), indirect);
>
> +   /* From the ARB_draw_indirect spec:
> +    *
> +    *    "Initially zero is bound to DRAW_INDIRECT_BUFFER. In the
> +    *    compatibility profile, this indicates that DrawArraysIndirect and
> +    *    DrawElementsIndirect are to source their arguments directly from the
> +    *    pointer passed as their <indirect> parameters."
> +    */
> +   if (ctx->API == API_OPENGL_COMPAT &&
> +       !_mesa_is_bufferobj(ctx->DrawIndirectBuffer)) {
> +      /*
> +       * Unlike regular DrawElementsInstancedBaseVertex commands, the indices
> +       * may not come from a client array and must come from an index buffer.
> +       * If no element array buffer is bound, an INVALID_OPERATION error is
> +       * generated.
> +       */
> +      if (!_mesa_is_bufferobj(ctx->Array.VAO->IndexBufferObj)) {
> +         _mesa_error(ctx, GL_INVALID_OPERATION,
> +                     "glDrawElementsIndirect(no buffer bound "
> +                     "to GL_ELEMENT_ARRAY_BUFFER)");
> +      } else {
> +         DrawElementsIndirectCommand *cmd =
> +            (DrawElementsIndirectCommand *) indirect;
> +
> +         /* Convert offset to pointer */
> +         void *offset = (void *)
> +            ((cmd->firstIndex * _mesa_sizeof_type(type)) & 0xffffffffUL);
> +
> +         vbo_exec_DrawElementsInstancedBaseVertex(mode, cmd->count, type,
> +                                                  offset, cmd->primCount,
> +                                                  cmd->baseVertex);
> +      }
> +
> +      return;
> +   }
> +
>     FLUSH_FOR_DRAW(ctx);
>
>     if (_mesa_is_no_error_enabled(ctx)) {
> @@ -1933,7 +1997,7 @@ vbo_initialize_exec_dispatch(const struct gl_context *ctx,
>                                                        vbo_exec_DrawElementsInstancedBaseVertexBaseInstance);
>     }
>
> -   if (ctx->API == API_OPENGL_CORE || _mesa_is_gles31(ctx)) {
> +   if (_mesa_is_desktop_gl(ctx) || _mesa_is_gles31(ctx)) {
>        SET_DrawArraysIndirect(exec, vbo_exec_DrawArraysIndirect);
>        SET_DrawElementsIndirect(exec, vbo_exec_DrawElementsIndirect);
>     }
> --
> 2.17.1
>
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