diff options
Diffstat (limited to 'mesalib/src/glsl/glsl_parser_extras.cpp')
| -rw-r--r-- | mesalib/src/glsl/glsl_parser_extras.cpp | 327 |
1 files changed, 218 insertions, 109 deletions
diff --git a/mesalib/src/glsl/glsl_parser_extras.cpp b/mesalib/src/glsl/glsl_parser_extras.cpp index 809e6d174..72acc2e38 100644 --- a/mesalib/src/glsl/glsl_parser_extras.cpp +++ b/mesalib/src/glsl/glsl_parser_extras.cpp @@ -165,133 +165,242 @@ _mesa_glsl_warning(const YYLTYPE *locp, _mesa_glsl_parse_state *state, }
+/**
+ * Enum representing the possible behaviors that can be specified in
+ * an #extension directive.
+ */
+enum ext_behavior {
+ extension_disable,
+ extension_enable,
+ extension_require,
+ extension_warn
+};
+
+/**
+ * Element type for _mesa_glsl_supported_extensions
+ */
+struct _mesa_glsl_extension {
+ /**
+ * Name of the extension when referred to in a GLSL extension
+ * statement
+ */
+ const char *name;
+
+ /** True if this extension is available to vertex shaders */
+ bool avail_in_VS;
+
+ /** True if this extension is available to geometry shaders */
+ bool avail_in_GS;
+
+ /** True if this extension is available to fragment shaders */
+ bool avail_in_FS;
+
+ /** True if this extension is available to desktop GL shaders */
+ bool avail_in_GL;
+
+ /** True if this extension is available to GLES shaders */
+ bool avail_in_ES;
+
+ /**
+ * Flag in the gl_extensions struct indicating whether this
+ * extension is supported by the driver, or
+ * &gl_extensions::dummy_true if supported by all drivers.
+ *
+ * Note: the type (GLboolean gl_extensions::*) is a "pointer to
+ * member" type, the type-safe alternative to the "offsetof" macro.
+ * In a nutshell:
+ *
+ * - foo bar::* p declares p to be an "offset" to a field of type
+ * foo that exists within struct bar
+ * - &bar::baz computes the "offset" of field baz within struct bar
+ * - x.*p accesses the field of x that exists at "offset" p
+ * - x->*p is equivalent to (*x).*p
+ */
+ const GLboolean gl_extensions::* supported_flag;
+
+ /**
+ * Flag in the _mesa_glsl_parse_state struct that should be set
+ * when this extension is enabled.
+ *
+ * See note in _mesa_glsl_extension::supported_flag about "pointer
+ * to member" types.
+ */
+ bool _mesa_glsl_parse_state::* enable_flag;
+
+ /**
+ * Flag in the _mesa_glsl_parse_state struct that should be set
+ * when the shader requests "warn" behavior for this extension.
+ *
+ * See note in _mesa_glsl_extension::supported_flag about "pointer
+ * to member" types.
+ */
+ bool _mesa_glsl_parse_state::* warn_flag;
+
+
+ bool compatible_with_state(const _mesa_glsl_parse_state *state) const;
+ void set_flags(_mesa_glsl_parse_state *state, ext_behavior behavior) const;
+};
+
+#define EXT(NAME, VS, GS, FS, GL, ES, SUPPORTED_FLAG) \
+ { "GL_" #NAME, VS, GS, FS, GL, ES, &gl_extensions::SUPPORTED_FLAG, \
+ &_mesa_glsl_parse_state::NAME##_enable, \
+ &_mesa_glsl_parse_state::NAME##_warn }
+
+/**
+ * Table of extensions that can be enabled/disabled within a shader,
+ * and the conditions under which they are supported.
+ */
+static const _mesa_glsl_extension _mesa_glsl_supported_extensions[] = {
+ /* target availability API availability */
+ /* name VS GS FS GL ES supported flag */
+ EXT(ARB_draw_buffers, false, false, true, true, false, dummy_true),
+ EXT(ARB_draw_instanced, true, false, false, true, false, ARB_draw_instanced),
+ EXT(ARB_explicit_attrib_location, true, false, true, true, false, ARB_explicit_attrib_location),
+ EXT(ARB_fragment_coord_conventions, true, false, true, true, false, ARB_fragment_coord_conventions),
+ EXT(ARB_texture_rectangle, true, false, true, true, false, dummy_true),
+ EXT(EXT_texture_array, true, false, true, true, false, EXT_texture_array),
+ EXT(ARB_shader_texture_lod, true, false, true, true, false, ARB_shader_texture_lod),
+ EXT(ARB_shader_stencil_export, false, false, true, true, false, ARB_shader_stencil_export),
+ EXT(AMD_conservative_depth, true, false, true, true, false, AMD_conservative_depth),
+ EXT(AMD_shader_stencil_export, false, false, true, true, false, ARB_shader_stencil_export),
+ EXT(OES_texture_3D, true, false, true, false, true, EXT_texture3D),
+};
+
+#undef EXT
+
+
+/**
+ * Determine whether a given extension is compatible with the target,
+ * API, and extension information in the current parser state.
+ */
+bool _mesa_glsl_extension::compatible_with_state(const _mesa_glsl_parse_state *
+ state) const
+{
+ /* Check that this extension matches the type of shader we are
+ * compiling to.
+ */
+ switch (state->target) {
+ case vertex_shader:
+ if (!this->avail_in_VS) {
+ return false;
+ }
+ break;
+ case geometry_shader:
+ if (!this->avail_in_GS) {
+ return false;
+ }
+ break;
+ case fragment_shader:
+ if (!this->avail_in_FS) {
+ return false;
+ }
+ break;
+ default:
+ assert (!"Unrecognized shader target");
+ return false;
+ }
+
+ /* Check that this extension matches whether we are compiling
+ * for desktop GL or GLES.
+ */
+ if (state->es_shader) {
+ if (!this->avail_in_ES) return false;
+ } else {
+ if (!this->avail_in_GL) return false;
+ }
+
+ /* Check that this extension is supported by the OpenGL
+ * implementation.
+ *
+ * Note: the ->* operator indexes into state->extensions by the
+ * offset this->supported_flag. See
+ * _mesa_glsl_extension::supported_flag for more info.
+ */
+ return state->extensions->*(this->supported_flag);
+}
+
+/**
+ * Set the appropriate flags in the parser state to establish the
+ * given behavior for this extension.
+ */
+void _mesa_glsl_extension::set_flags(_mesa_glsl_parse_state *state,
+ ext_behavior behavior) const
+{
+ /* Note: the ->* operator indexes into state by the
+ * offsets this->enable_flag and this->warn_flag. See
+ * _mesa_glsl_extension::supported_flag for more info.
+ */
+ state->*(this->enable_flag) = (behavior != extension_disable);
+ state->*(this->warn_flag) = (behavior == extension_warn);
+}
+
+/**
+ * Find an extension by name in _mesa_glsl_supported_extensions. If
+ * the name is not found, return NULL.
+ */
+static const _mesa_glsl_extension *find_extension(const char *name)
+{
+ for (unsigned i = 0; i < Elements(_mesa_glsl_supported_extensions); ++i) {
+ if (strcmp(name, _mesa_glsl_supported_extensions[i].name) == 0) {
+ return &_mesa_glsl_supported_extensions[i];
+ }
+ }
+ return NULL;
+}
+
+
bool
_mesa_glsl_process_extension(const char *name, YYLTYPE *name_locp,
- const char *behavior, YYLTYPE *behavior_locp,
+ const char *behavior_string, YYLTYPE *behavior_locp,
_mesa_glsl_parse_state *state)
{
- enum {
- extension_disable,
- extension_enable,
- extension_require,
- extension_warn
- } ext_mode;
-
- if (strcmp(behavior, "warn") == 0) {
- ext_mode = extension_warn;
- } else if (strcmp(behavior, "require") == 0) {
- ext_mode = extension_require;
- } else if (strcmp(behavior, "enable") == 0) {
- ext_mode = extension_enable;
- } else if (strcmp(behavior, "disable") == 0) {
- ext_mode = extension_disable;
+ ext_behavior behavior;
+ if (strcmp(behavior_string, "warn") == 0) {
+ behavior = extension_warn;
+ } else if (strcmp(behavior_string, "require") == 0) {
+ behavior = extension_require;
+ } else if (strcmp(behavior_string, "enable") == 0) {
+ behavior = extension_enable;
+ } else if (strcmp(behavior_string, "disable") == 0) {
+ behavior = extension_disable;
} else {
_mesa_glsl_error(behavior_locp, state,
"Unknown extension behavior `%s'",
- behavior);
+ behavior_string);
return false;
}
- bool unsupported = false;
-
if (strcmp(name, "all") == 0) {
- if ((ext_mode == extension_enable) || (ext_mode == extension_require)) {
+ if ((behavior == extension_enable) || (behavior == extension_require)) {
_mesa_glsl_error(name_locp, state, "Cannot %s all extensions",
- (ext_mode == extension_enable)
+ (behavior == extension_enable)
? "enable" : "require");
return false;
- }
- } else if (strcmp(name, "GL_ARB_draw_buffers") == 0) {
- /* This extension is only supported in fragment shaders.
- */
- if (state->target != fragment_shader) {
- unsupported = true;
} else {
- state->ARB_draw_buffers_enable = (ext_mode != extension_disable);
- state->ARB_draw_buffers_warn = (ext_mode == extension_warn);
+ for (unsigned i = 0;
+ i < Elements(_mesa_glsl_supported_extensions); ++i) {
+ const _mesa_glsl_extension *extension
+ = &_mesa_glsl_supported_extensions[i];
+ if (extension->compatible_with_state(state)) {
+ _mesa_glsl_supported_extensions[i].set_flags(state, behavior);
+ }
+ }
}
- } else if (strcmp(name, "GL_ARB_draw_instanced") == 0) {
- state->ARB_draw_instanced_enable = (ext_mode != extension_disable);
- state->ARB_draw_instanced_warn = (ext_mode == extension_warn);
-
- /* This extension is only supported in vertex shaders.
- */
- unsupported = (state->target != vertex_shader)
- || !state->extensions->ARB_draw_instanced;
- } else if (strcmp(name, "GL_ARB_explicit_attrib_location") == 0) {
- state->ARB_explicit_attrib_location_enable =
- (ext_mode != extension_disable);
- state->ARB_explicit_attrib_location_warn =
- (ext_mode == extension_warn);
-
- unsupported = !state->extensions->ARB_explicit_attrib_location;
- } else if (strcmp(name, "GL_ARB_fragment_coord_conventions") == 0) {
- state->ARB_fragment_coord_conventions_enable =
- (ext_mode != extension_disable);
- state->ARB_fragment_coord_conventions_warn =
- (ext_mode == extension_warn);
-
- unsupported = !state->extensions->ARB_fragment_coord_conventions;
- } else if (strcmp(name, "GL_ARB_texture_rectangle") == 0) {
- state->ARB_texture_rectangle_enable = (ext_mode != extension_disable);
- state->ARB_texture_rectangle_warn = (ext_mode == extension_warn);
- } else if (strcmp(name, "GL_EXT_texture_array") == 0) {
- state->EXT_texture_array_enable = (ext_mode != extension_disable);
- state->EXT_texture_array_warn = (ext_mode == extension_warn);
-
- unsupported = !state->extensions->EXT_texture_array;
- } else if (strcmp(name, "GL_ARB_shader_texture_lod") == 0) {
- /* Force ARB_texture_rectangle to be on so sampler2DRects are defined */
- state->ARB_texture_rectangle_enable = true;
-
- state->ARB_shader_texture_lod_enable = (ext_mode != extension_disable);
- state->ARB_shader_texture_lod_warn = (ext_mode == extension_warn);
-
- unsupported = !state->extensions->ARB_shader_texture_lod;
- } else if (strcmp(name, "GL_ARB_shader_stencil_export") == 0) {
- state->ARB_shader_stencil_export_enable = (ext_mode != extension_disable);
- state->ARB_shader_stencil_export_warn = (ext_mode == extension_warn);
-
- /* This extension is only supported in fragment shaders.
- */
- unsupported = (state->target != fragment_shader)
- || !state->extensions->ARB_shader_stencil_export;
- } else if (strcmp(name, "GL_AMD_conservative_depth") == 0) {
- /* The AMD_conservative spec does not forbid requiring the extension in
- * the vertex shader.
- */
- state->AMD_conservative_depth_enable = (ext_mode != extension_disable);
- state->AMD_conservative_depth_warn = (ext_mode == extension_warn);
- unsupported = !state->extensions->AMD_conservative_depth;
- } else if (strcmp(name, "GL_AMD_shader_stencil_export") == 0) {
- state->AMD_shader_stencil_export_enable = (ext_mode != extension_disable);
- state->AMD_shader_stencil_export_warn = (ext_mode == extension_warn);
-
- /* This extension is only supported in fragment shaders.
- * Both the ARB and AMD variants share the same ARB flag
- * in gl_extensions.
- */
- unsupported = (state->target != fragment_shader)
- || !state->extensions->ARB_shader_stencil_export;
- } else if (strcmp(name, "GL_OES_texture_3D") == 0 && state->es_shader) {
- state->OES_texture_3D_enable = (ext_mode != extension_disable);
- state->OES_texture_3D_warn = (ext_mode == extension_warn);
-
- unsupported = !state->extensions->EXT_texture3D;
} else {
- unsupported = true;
- }
-
- if (unsupported) {
- static const char *const fmt = "extension `%s' unsupported in %s shader";
-
- if (ext_mode == extension_require) {
- _mesa_glsl_error(name_locp, state, fmt,
- name, _mesa_glsl_shader_target_name(state->target));
- return false;
+ const _mesa_glsl_extension *extension = find_extension(name);
+ if (extension && extension->compatible_with_state(state)) {
+ extension->set_flags(state, behavior);
} else {
- _mesa_glsl_warning(name_locp, state, fmt,
- name, _mesa_glsl_shader_target_name(state->target));
+ static const char *const fmt = "extension `%s' unsupported in %s shader";
+
+ if (behavior == extension_require) {
+ _mesa_glsl_error(name_locp, state, fmt,
+ name, _mesa_glsl_shader_target_name(state->target));
+ return false;
+ } else {
+ _mesa_glsl_warning(name_locp, state, fmt,
+ name, _mesa_glsl_shader_target_name(state->target));
+ }
}
}
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