diff options
Diffstat (limited to 'src/mesa')
| -rw-r--r-- | src/mesa/main/shader_query.cpp | 71 |
1 files changed, 66 insertions, 5 deletions
diff --git a/src/mesa/main/shader_query.cpp b/src/mesa/main/shader_query.cpp index f66c117338c..36d1d9cc025 100644 --- a/src/mesa/main/shader_query.cpp +++ b/src/mesa/main/shader_query.cpp @@ -153,6 +153,63 @@ _mesa_GetActiveAttrib(GLhandleARB program, GLuint desired_index, _mesa_error(ctx, GL_INVALID_VALUE, "glGetActiveAttrib(index)"); } +/* Locations associated with shader variables (array or non-array) can be + * queried using its base name or using the base name appended with the + * valid array index. For example, in case of below vertex shader, valid + * queries can be made to know the location of "xyz", "array", "array[0]", + * "array[1]", "array[2]" and "array[3]". In this example index reurned + * will be 0, 0, 0, 1, 2, 3 respectively. + * + * [Vertex Shader] + * layout(location=0) in vec4 xyz; + * layout(location=1) in vec4[4] array; + * void main() + * { } + * + * This requirement came up with the addition of ARB_program_interface_query + * to OpenGL 4.3 specification. See page 101 (page 122 of the PDF) for details. + * + * This utility function is used by: + * _mesa_GetAttribLocation + * _mesa_GetFragDataLocation + * _mesa_GetFragDataIndex + * + * Returns 0: + * if the 'name' string matches var->name. + * Returns 'matched index': + * if the 'name' string matches var->name appended with valid array index. + */ +int static inline +get_matching_index(const ir_variable *const var, const char *name) { + unsigned idx = 0; + const char *const paren = strchr(name, '['); + const unsigned len = (paren != NULL) ? paren - name : strlen(name); + + if (paren != NULL) { + if (!var->type->is_array()) + return -1; + + char *endptr; + idx = (unsigned) strtol(paren + 1, &endptr, 10); + const unsigned idx_len = endptr != (paren + 1) ? endptr - paren - 1 : 0; + + /* Validate the sub string representing index in 'name' string */ + if ((idx > 0 && paren[1] == '0') /* leading zeroes */ + || (idx == 0 && idx_len > 1) /* all zeroes */ + || paren[1] == ' ' /* whitespace */ + || endptr[0] != ']' /* closing brace */ + || endptr[1] != '\0' /* null char */ + || idx_len == 0 /* missing index */ + || idx >= var->type->length) /* exceeding array bound */ + return -1; + } + + if (strncmp(var->name, name, len) == 0 && var->name[len] == '\0') + return idx; + + return -1; +} + GLint GLAPIENTRY _mesa_GetAttribLocation(GLhandleARB program, const GLcharARB * name) { @@ -196,8 +253,10 @@ _mesa_GetAttribLocation(GLhandleARB program, const GLcharARB * name) || var->data.location < VERT_ATTRIB_GENERIC0) continue; - if (strcmp(var->name, name) == 0) - return var->data.location - VERT_ATTRIB_GENERIC0; + int index = get_matching_index(var, (const char *) name); + + if (index >= 0) + return var->data.location + index - VERT_ATTRIB_GENERIC0; } return -1; @@ -358,7 +417,7 @@ _mesa_GetFragDataIndex(GLuint program, const GLchar *name) || var->data.location < FRAG_RESULT_DATA0) continue; - if (strcmp(var->name, name) == 0) + if (get_matching_index(var, (const char *) name) >= 0) return var->data.index; } @@ -414,8 +473,10 @@ _mesa_GetFragDataLocation(GLuint program, const GLchar *name) || var->data.location < FRAG_RESULT_DATA0) continue; - if (strcmp(var->name, name) == 0) - return var->data.location - FRAG_RESULT_DATA0; + int index = get_matching_index(var, (const char *) name); + + if (index >= 0) + return var->data.location + index - FRAG_RESULT_DATA0; } return -1; |