shader_runner: Added a variant of the "ortho" command that takes parameters

This allows shader_runner tests to specify explicit left, right,
bottom, and top values rather than the default of (0, window width, 0,
window height).
Reviewed-by: Chad Versace <chad@chad-versace.us>

tests/shaders/shader_runner.c

@@ -886,6 +886,10 @@ piglit_display(void)
 			do_enable_disable(line + 7, false);
 		} else if (string_match("enable", line)) {
 			do_enable_disable(line + 6, true);
+		} else if (sscanf(line, "ortho %f %f %f %f",
+				  c + 0, c + 1, c + 2, c + 3) == 4) {
+			piglit_gen_ortho_projection(c[0], c[1], c[2], c[3],
+						    -1, 1, GL_FALSE);
 		} else if (string_match("ortho", line)) {
 			piglit_ortho_projection(piglit_width, piglit_height,
 						GL_FALSE);

tests/util/piglit-util-gl.c

@@ -731,19 +731,18 @@ piglit_draw_rect_tex(float x, float y, float w, float h,
 
 
 /**
- * Convenience function to configure projection matrix for window coordinates
+ * Convenience function to configure an abitrary orthogonal projection matrix
  */
 void
-piglit_ortho_projection(int w, int h, GLboolean push)
+piglit_gen_ortho_projection(double left, double right, double bottom,
+			    double top, double near_val, double far_val,
+			    GLboolean push)
 {
-        /* Set up projection matrix so we can just draw using window
-         * coordinates.
-         */
         glMatrixMode(GL_PROJECTION);
         glLoadIdentity();
 	if (push)
 		glPushMatrix();
-        glOrtho(0, w, 0, h, -1, 1);
+        glOrtho(left, right, bottom, top, near_val, far_val);
 
         glMatrixMode(GL_MODELVIEW);
 	if (push)
@@ -752,6 +751,19 @@ piglit_ortho_projection(int w, int h, GLboolean push)
 }
 
 
+/**
+ * Convenience function to configure projection matrix for window coordinates
+ */
+void
+piglit_ortho_projection(int w, int h, GLboolean push)
+{
+        /* Set up projection matrix so we can just draw using window
+         * coordinates.
+         */
+	piglit_gen_ortho_projection(0, w, 0, h, -1, 1, push);
+}
+
+
 
 /**
  * Generate a checkerboard texture

tests/util/piglit-util.h

@@ -147,6 +147,9 @@ void piglit_escape_exit_key(unsigned char key, int x, int y);
 
 char *piglit_load_text_file(const char *file_name, unsigned *size);
 
+void piglit_gen_ortho_projection(double left, double right, double bottom,
+				 double top, double near_val, double far_val,
+				 GLboolean push);
 void piglit_ortho_projection(int w, int h, GLboolean push);
 
 GLuint piglit_checkerboard_texture(GLuint tex, unsigned level,